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Study on Pretreatment during Simultaneous Determination of Sulfonamides and Chloramphenicols in Honey 被引量:2
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作者 Guangfeng ZHONG Xiaoling LIU Chengmei WANG 《Agricultural Biotechnology》 CAS 2017年第2期51-54,共4页
[ Objective] This study was conducted to establish a new UPLC-MS method for simultaneous detection of sulfonanfides and chloramphenicols in honey. [ Method] In this experiment, 0.2% formic acid-acetonitrile was used a... [ Objective] This study was conducted to establish a new UPLC-MS method for simultaneous detection of sulfonanfides and chloramphenicols in honey. [ Method] In this experiment, 0.2% formic acid-acetonitrile was used as an extractant to simultaneously extract chloramphenicoJs and sulfonamides from drugs. The extract was then loaded and extracted with an efficient separation column Oasis PRIME HLB. After nitrogen blow-concentration and dissolution with mobile phase, the extract was loaded on UPLC and detected by MS. [ Resultl There was a good linear relation in the range of 0. 1 - 10 ng/ml for chloramphenicols, with a correlation coefficient of 0.991, while sulfonamides had a good linear relation in the range of 0.5 - 50 ng/ml. The lowest detection limit of chloramphenicols and sulfonamides were 0. 1 and 0.5 μg/kg, respectively. The recoveries were in the range of 82.50% - 101.2%, with RSD values in the range of 3.2% -4.0%. [ Conclusion] This method is simple and fast with low detection limit, high recovery and good reproducibility, and could be used for simultaneous detection of re- sidual chloramphenicols and sulfonamides in honey. Key words UHPLC-MS; Sulfonamides ; Chloramphenicols ; Honey 展开更多
关键词 UHPLC-MS SULFONAMIDES chloramphenicols HONEY
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Antimicrobial susceptibility of vancomycin-resistant staphylococci of clinical origin in Bareilly, North India
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作者 Bhoj Raj Singh Himani Agri +2 位作者 Akanksha Yadav Varsha Jayakumar Abhijit Motiram Pawde 《Infectious Diseases Research》 2024年第4期1-12,共12页
Background:Vancomycin resistance(VR)in staphylococci is emerging fast and posing serious health problems as vancomycin is considered the drug of choice for the treatment of methicillin-resistant staphylococcal infecti... Background:Vancomycin resistance(VR)in staphylococci is emerging fast and posing serious health problems as vancomycin is considered the drug of choice for the treatment of methicillin-resistant staphylococcal infections.Much research has been done on vancomycin-resistant Staphylococcus aureus(VRSA)strains infecting humans and animals but little is understood about other vancomycin-resistant staphylococci(VRS).This study was conducted to determine diversity among staphylococcal species causing infections and to know effective antimicrobials for therapeutic intervention for treatment of infections with vancomycin resistant staphylococci.Methods:Antimicrobial susceptibility data of 620 strains of staphylococci isolated from January 2016 to December 2023 from referred clinical samples were retrieved with their host of origin and association with different types of infections in animals,birds and humans from Clinical Epidemiology of the Institute.All isolates were tested for VR through their growing ability on vancomycin-supplemented(6µg mL-1)brain heart infusion agar.Data was analysed in Microsoft Excel.Results:Staphylococci strains(620)belonged to 26 species and 287 vancomycin-resistant.Of the 287 VRS strains detected only 46(16.03%)were VRSA.Irrespective of their origin and association with different ailments VRS strains were more resistant to herbal and conventional antimicrobial than VSS strains.The most effective antibiotics inhibiting≥80%of the staphylococci were tigecycline,imipenem,nitrofurantoin,linezolid and chloramphenicol inhibiting 88%,86%,86%,81%and 81%of the MRS and 92.31%,94.88%,92.25%,89.09%and 86.56%VRS strains,respectively.Among herbal antimicrobials,the most effective herbal compound was carvacrol followed by thyme oil,cinnamledehyde and ajowan oil,inhibiting≥80%of the strains.VR was most common among S.xylosus,S.schleiferi,and S.delphini strains while S.caseolyticus strains had the least probability of having VR.Staphylococci from mastitis cases had the least probability of possessing VR while those from wound infection had the highest probability of having VR.Conclusion:The study revealed that besides S.aureus,25 more species of staphylococci may be infecting animals,birds and humans.VR was more common in S.xylosus,S.schleiferi,S.auricularis,S.delphini and S.hyicus than in S.aureus strains,and of the VRS and MRS strains,83.97%and 83.46%were non-VRSA and non-methicillin-resistant S.aureus,respectively.Imipenem,tigecycline,nitrofurantoin,chloramphenicol,linezolid,meropenem and minocycline may be a better choice for the treatment of infections caused by methicillin as well as vancomycin-resistant staphylococci. 展开更多
关键词 VRSA VRS MRSA MDR imipenem TIGECYCLINE NITROFURANTOIN CHLORAMPHENICOL LINEZOLID
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Prevalence and Characterization of Pathogens Responsible for Enteric Fever and Assessment of Their Antibiotic Susceptibility Pattern in Bangladesh
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作者 Saima Mollick Md. Jabir Hasnain +1 位作者 Md. Saiful Islam Tumpa Dasgupta 《Pharmacology & Pharmacy》 2024年第9期303-313,共11页
In Bangladesh, Enteric fever is a persistent health issue throughout the year, occasionally reaching epidemic levels. The growing antibiotic resistance makes treatment increasingly challenging. Therefore, studying the... In Bangladesh, Enteric fever is a persistent health issue throughout the year, occasionally reaching epidemic levels. The growing antibiotic resistance makes treatment increasingly challenging. Therefore, studying the antibiotic resistance patterns within the population is crucial to ensure a more effective treatment strategy. This study was designed to determine the prevalence, antimicrobial susceptibility profile, and factors associated with Salmonella spp. infections among clinically suspected Enteric fever patients in Bangladesh. This study also aimed to investigate whether there has been a re-emergence in the susceptibility of bacterial strains to conventional drugs. Data were collected from February 2024 to July 2024, from patients suspected Enteric fever (fever less than seven days duration) in a Private Diagnostic Center of Bangladesh. A total of 195 blood samples were cultured, where 53.85% came out positive, among which 79.05% Salmonella typhi and 20.95% Salmonella paratyphi A were found. Prevalence of Typhoid fever was observed high among the school-going age group (0 - 15 years) patients. Both these organisms were susceptible to ceftazidime, cefixime, ceftriaxone and cefepime but resistant to nalidixic acid, ciprofloxacin and levofloxacin. Nalidixic Acid is resistant to all S. paratyphi A and sensitive to few S. typhi. Ciprofloxacin and levofloxacin showed delayed response (36.14% and 22.72% sensitive to S. typhi and S. paratyphi A, respectively) and resistance (63.85% and 77.27% resistant to S. typhi and S. paratyphi A, respectively). In case of S. typhi, the resistance was found against ampicillin (32.53%), chloramphenicol (27.71%), cotrimoxazole (24.09%) and the resistance of S. paratyphi A found against ampicillin (4.54%), chloramphenicol (0%) and cotrimoxazole (0%). This study will provide clinicians with alternative drug options and facilitate the effective treatment of Enteric fever. 展开更多
关键词 TYPHOID SALMONELLA Nalidixic Acid CIPROFLOXACIN CHLORAMPHENICOL COTRIMOXAZOLE
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Clinical Observation of Chuanbai Antipruritic Lotion"Water Film"Wet Compress Combined with Chloramphenicol Prednisone Liniment in the Treatment of Acute Eczema
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作者 Benlu QIN Haixia JING 《Medicinal Plant》 2023年第6期50-53,共4页
[Objectives]To observe and analyze the clinical efficacy and possible mechanism of Chuanbai antipruritic lotion"water film"wet compress combined with chloramphenicol prednisone liniment in the treatment of a... [Objectives]To observe and analyze the clinical efficacy and possible mechanism of Chuanbai antipruritic lotion"water film"wet compress combined with chloramphenicol prednisone liniment in the treatment of acute eczema.[Methods]A total of 76 acute eczema cases admitted to Shiyan Taihe Hospital from January 2022 to March 2023 were divided into Western medicine treatment group and integrated traditional Chinese and Western medicine group.In the Western medicine treatment group,chloramphenicol and prednisone liniment was applied to the skin lesions and oral administration of cetirizine hydrochloride.The course of treatment in both groups was 2 weeks(w).The levels of interferon-γ(IFN-γ),interleukin-4(IL-4)and the ratio of IFN-γ/IL-4 in the peripheral blood of patients before and 2 weeks after treatment,as well as serum immunoglobulin E(IgE),anti-IgE antibody and histamine(HA)level,and with skin lesions disappearing time,skin oil,transepidermal water loss(TEWL),eczema area and severity index(EASI)score,total effective rate,degree of pruritus and traditional Chinese medicine quality of life scale(EPQOLS)score to evaluate the efficacy.[Results]Compared with the Western medicine treatment group at 2 w,the disappearance time of skin lesions in the integrated traditional Chinese and Western medicine group was shortened,TEWL,itching degree and EASI score,serum IgE and HA,and peripheral blood IL-4 levels were all decreased(P<0.05).IFN-γand IFN-γ/IL-4 ratio,anti-IgE antibody,EPQOLS score and total effective rate were all increased(P<0.05),and the difference was statistically significant.[Conclusions]Chuanbai antipruritic lotion"water film"wet compress combined with chloramphenicol prednisone liniment is an optimized and safe and efficient method for the treatment of acute eczema,which can quickly relieve the symptoms of inflammatory damage of eczema and restore the skin barrier function,dry dampness and relieve itch.Inhibition of the release of histamine active substances and regulation of immunity may be the main mechanisms. 展开更多
关键词 Acute eczema Chuanbai antipruritic lotion Chloramphenicol and prednisone liniment Dampness and itching Histamine Immunoglobulin E
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气相色谱-质谱法测定化妆品中的氯霉素 被引量:11
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作者 谢维平 陈春祝 +1 位作者 黄盈煜 傅晖蓉 《色谱》 CAS CSCD 北大核心 2006年第6期659-659,共1页
关键词 气相色谱-质谱(GC-MS) 乙酸酐(acetic anhydride) 氯霉索(chloramphenicol) 衍生化(derivatization) 化妆品(cosmetics)
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超高效液相色谱-串联质谱法对奶粉中氯霉素残留的检测 被引量:16
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作者 李丹妮 严凤 +3 位作者 张文刚 曹莹 蒋音 黄士新 《分析测试学报》 CAS CSCD 北大核心 2008年第S1期161-163,共3页
A method was developed for the determination of chloramphenicol residue in milk powder by UPLC-MS/MS.The residue was extracted with ethylacetate from the milk powder,cleaned up by C18 SPE column,and detected by electr... A method was developed for the determination of chloramphenicol residue in milk powder by UPLC-MS/MS.The residue was extracted with ethylacetate from the milk powder,cleaned up by C18 SPE column,and detected by electrospray ionization and in the negative ion mode.The method had higher sensitivity and shorter analytical time,and was suitable for determination of chloramphenicol in milk powder. 展开更多
关键词 CHLORAMPHENICOL UPLC-MS/MS MILK POWDER
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Study on Synthesis and Chloramphenicol Release of Poly(2-hydroxyethylmethacrylate-co-acrylamide) Hydrogels 被引量:5
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作者 黎新明 崔英德 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2008年第4期640-645,共6页
In this article, poly(2-hydroxyethylmethacrylate-co-acrylamide) hydrogels were synthesized by bulk free-radical copolymerization of 2-hydroxyethylmethacrylate (HEMA) and acrylamide (AAm) for soft contact lens(... In this article, poly(2-hydroxyethylmethacrylate-co-acrylamide) hydrogels were synthesized by bulk free-radical copolymerization of 2-hydroxyethylmethacrylate (HEMA) and acrylamide (AAm) for soft contact lens(SCL)-based ophthalmic drug delivery system. The copolymer was characterized with FT-IR and SEM, the swelling property of the hydrogels were studied by gravimetrical method, and chloramphenicol was used as a model drug to investigate drug release profile of the hydrogels. The results showed that poly(2-hydroxyethylmethacrylateco-acrylamide) hydrogels were transparent and useful SCL biomaterial, the water content increased as AAm content increase and pH decrease, and in the same way, hydrogel composition affected chloramphenicol release process too. Migration rate of chloramphenicol increased as the AAm content in the hydrogels increased in the first stage of diffusion process, whereas there was no significant difference thereafter. 展开更多
关键词 HYDROGELS drug delivery CHLORAMPHENICOL pH-sensible
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Horizontal transfer of vanA between probiotic Enterococcus faecium and Enterococcus faecalis in fermented soybean meal and in digestive tract of growing pigs 被引量:2
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作者 Ning Li Haitao Yu +6 位作者 Hongbin Liu Yuming Wang Junyan Zhou Xi Ma Zheng Wang Chengtao Sun Shiyan Qiao 《Journal of Animal Science and Biotechnology》 SCIE CAS CSCD 2019年第3期778-788,共11页
Background: The aim of this study was to investigate the intergeneric transfer of vancomycin resistance gene vanA between probiotic enterococci in the fermentation progress of soybean meal and in the digestive tract o... Background: The aim of this study was to investigate the intergeneric transfer of vancomycin resistance gene vanA between probiotic enterococci in the fermentation progress of soybean meal and in the digestive tract of growing pigs.One vanA genotype vancomycin resistant E.faecium strain,Efm4,and one chloramphenicol-resistant E.faecalis strain,Efs2,were isolated from twenty-nine probiotic basis feed material/additive samples.For in vitro conjugation,Efm4 and Efs2 were used as starter to ferment soybean meal.For in vivo conjugation,thirty growing pigs were randomly assigned to five groups(n = 6),treated with a basic diet,or supplemented with 10% fermented soybean meal,1% Efm4,5% Efs2 or a combination of 1% Efm4 + 5% Efs2 for 7 d,respectively.Fecal samples of pigs in each group were collected daily for the isolation and dynamic analysis of Efm4,Efs2 and transconjugants.The sequence types(STs) of Efm4,Efs2 and transconjugants were analyzed by multilocus sequence typing(MLST).The vanA harboring plasmid in Efm4 and transconjugants was analyzed by S1-pulsed field gel electrophoresis(PFGE)and further verified by multiple alignments.Results: The results showed that,in FSBM,transconjugants were detected 1 h after the fermentation,with a conjugation frequency of ~ 10^-3 transconjugants/recipient.Transconjugants proliferated with Efm4 and Efs2 in the first 8 h and maintained steadily for 10 d till the end of the experiment.Additionally,in vivo experiment showed that transcojugants were recovered in one of six pigs in both FSBM and Efm4 + Efs2 groups,with conjugation frequency of ~ 10^-5 and ~ 10^-4,respectively.MLST revealed the ST of Efm4,Efs2 and transconjugants was ST1014,ST69 and ST69,respectively.S1-PFGE confirmed the existence of the vanA-harboring,142,988-bp plasmid,which was also a multi-drug resistant plasmid containing Tn1546-like transposon.Conclusions: The findings revealed the potential safety hazard existing in the commercial probiotic enterococci in China,because the horizontal transfer from farm to fork could potentially pose a safety risk to the public. 展开更多
关键词 CHLORAMPHENICOL DIGESTIVE tract ENTEROCOCCI FERMENTED soybean meal Growing pigs Probiotics Transconjugants VANA VANCOMYCIN
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Synthesis and Structural Determination of (2R,4S,SS)-(+)-Threo-5-(2,2-dichloroacetamido)-4-(4-nitrophenyl)-2-aryl-1,3-dioxanes 被引量:1
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作者 Jun LIU Xian Ming HU Han Sheng XU(Department of Chemistry, Wuhan University, Wuhan 430072) 《Chinese Chemical Letters》 SCIE CAS CSCD 1999年第3期199-200,共2页
(2R,4S,SS)-(+)-threo-5-(2,2-dicloroacetamido)-4-(4-nitrophenyl-2aryl-l,3dioxanes, were synthesized with high diastereoselectivity and good yields. The structuresofacetals were determined and the configurations were co... (2R,4S,SS)-(+)-threo-5-(2,2-dicloroacetamido)-4-(4-nitrophenyl-2aryl-l,3dioxanes, were synthesized with high diastereoselectivity and good yields. The structuresofacetals were determined and the configurations were confirmed by 2D-NMR (NOESY). 展开更多
关键词 ACETALS diastereoselective synthesis CHLORAMPHENICOL 2D-NMR
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Synthesis of Substituted Aziridine from (1S,2S)-2-Amino-1- (4-Nitrophenyl)- 1,3-Propanediol 被引量:1
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作者 Yang Shao-rong Hu Xian-ming +3 位作者 Liu Jun Shu Jia-you Feng Dai-jun Huang Jin-xia 《Wuhan University Journal of Natural Sciences》 EI CAS 2000年第3期345-347,共3页
(2S, 3R)-2-acetooxymethanyl-3-(P-nitrophenyl)-N-tosylaziridine 5 was synthesized from (1S, 2S)-2-amino-1-(4-nitrophenyl)-1, 3-propanediol 1 in four steps with a 24.8% overall yield. This reaction is stereospecific and... (2S, 3R)-2-acetooxymethanyl-3-(P-nitrophenyl)-N-tosylaziridine 5 was synthesized from (1S, 2S)-2-amino-1-(4-nitrophenyl)-1, 3-propanediol 1 in four steps with a 24.8% overall yield. This reaction is stereospecific and occurs an expectable configuration inversion at α-carbon atom of benzyl group. The structure of substituted aziridine was determined on FT-IR, NMR, MS and so on. 展开更多
关键词 AZIRIDINES synthesis CHLORAMPHENICOL
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Decomposition mechanism of chloramphenicol under electron beam irradiation 被引量:1
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作者 周佳欣 吴明红 +3 位作者 徐刚 任来堂 唐量 白玉磊 《Journal of Shanghai University(English Edition)》 CAS 2010年第4期286-291,共6页
The purpose of this study was to evaluate the potential of electron beam to decompose chloramphenicol (CAP) in aqueous solutions. At the absorbed dose of 15 kGy, the decomposition rate of CAP was 95.24%. The degrada... The purpose of this study was to evaluate the potential of electron beam to decompose chloramphenicol (CAP) in aqueous solutions. At the absorbed dose of 15 kGy, the decomposition rate of CAP was 95.24%. The degradation of CAP under electron beam irradiation followed pseudo-first-order kinetics. Redox reactions of CAP aqueous solutions with hydroxyl radicals (.OH), hydrated electrons (eaq) and hydrated atoms (·H) were studied. The increase of the additives would result in the decrease of the degradation efficiency. The concentration of Cl- and NO3- in aqueous solution increased after electron beam irradiation. On the basis of the experimental results, a photocatalytic mechanism was discussed. The rate constant for reactions of .OH and CAP was 9.36×10^7 L/(mol.s) and for reaction of eaq and CAP was 7.33×10^7 L/(mol.s)..OH was supposed to play the key role in the radiation system of aqueous solution. Other free radicals like eaq and .H could also initiate the degradation. 展开更多
关键词 chloramphenicol (CAP) electron beam IRRADIATION MECHANISM
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Rapid Screening of chloramphenicol in Turbot with photobacterium phosphoreum DB 被引量:1
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作者 朱兰兰 Wang Jingxue +3 位作者 Lin Hong Wang Yaqun Wang Jing Mei Cexia 《High Technology Letters》 EI CAS 2009年第2期214-219,共6页
A new,simple,rapid microbial assay was put forward for the detection of chloramphenicol(CAP)residues in Turbot muscles using luminescent bacteria DB(Photobacterium phosphoreum)as test organ-ism.By the luminescence inh... A new,simple,rapid microbial assay was put forward for the detection of chloramphenicol(CAP)residues in Turbot muscles using luminescent bacteria DB(Photobacterium phosphoreum)as test organ-ism.By the luminescence inhibition of DB,the concentrations of CAP were determined.CAP spiked inTurbot muscle tissues ranging from 0.5 to 100μg/kg was extracted using ethyl acetate and hexane.Themethod had a good recovery of 93.69% with a minimum detection limit of 0.65μg/kg.It can be per-formed within 30min following simple extraction.The method therefore proved to be advantageous overchromatographic procedures as it was inexpensive,quite sensitive and can be adopted for rapid screeningof CAP in Turbot tissues. 展开更多
关键词 CHLORAMPHENICOL Photobacterium phosphoreum microbial assay TURBOT
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Enhancing chloramphenicol and trimethoprim in vitro activity by Ocimum sanctum Linn.(Lamiaceae) leaf extract against Salmonella enterica serovar Typhi
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作者 Shyamapada Mandal Manisha Deb Mandal Nishith Kumar Pal 《Asian Pacific Journal of Tropical Medicine》 SCIE CAS 2012年第3期220-224,共5页
Objective:To evaluate the antibacterial activity of Ocimum sanctum(O.sanctum) leaf extract, alone,and in combination with chloramphenicol(C) and trimethoprim(Tm) against Salmonella enterica serovar Typhi(S.typhi).Meth... Objective:To evaluate the antibacterial activity of Ocimum sanctum(O.sanctum) leaf extract, alone,and in combination with chloramphenicol(C) and trimethoprim(Tm) against Salmonella enterica serovar Typhi(S.typhi).Methods:The antibacterial activity of ethanolic extract of tulsi, 0.sanctum,leaf(TLE:500μg) for 23 S.typhi isolates was determined following agar diffusion. The C(30μg) and Tm(5μg) activity alone and in combination with TLE(250μg) was determined by disk diffusion.The zone diameter of inhibition(ZDI) for the agents was recorded, and growth inhibitory indices(Glls) were calculated.Results:The S.typhi isolates(n=23),which were resistant to both C(ZDI 6 mm) and Tm(ZDI 6 mm),had TLE(500μg) ZDIs 16-24 mm.The ZDIs of C and Tm were increased up to 15-21 mm and 17-23 mm,respectively,when TLE(250μg) was added to the C and Tm discs.The Glls ranged 0.789-1.235 and 0.894-1.352,due to combined activity against S.typhi isolates,of C and TLE and Tm and TLE.respeclivelv.Conclusions:The data suggest that TLE,in combination with C and Tm,had synergistic activity for S.typhi isolates, and hence O.sanclum is potential in combating S.typhi drug resistance,as well promising in the development of non-antibiotic drug for S.typhi infection. 展开更多
关键词 Antibacterial activity OCIMUM sanctum CHLORAMPHENICOL TRIMETHOPRIM Growth inhibitory index Synergy Salmonella ENTERICA SEROVAR Typhi
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Asymmetric Reduction of Aromatic Ketones Catalyzed by Using (αs,4s)-2-Dichloromethyl-4,5-Dihydro-α-(4-Nitrophenyl)-4- Oxazolemethanol-Borane Complex
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作者 Shi Yu, Hu Quan-yuan, Yang Shao-rong, Hu Xian-ming College of Pharmacy, Wuhan University, Wuhan 430072, Hubei, China 《Wuhan University Journal of Natural Sciences》 EI CAS 2002年第1期113-116,共4页
Chiral oxazoborolidine borane complex was prepared from (αs, 4s)-2-dichloromethyl-4, 5-dihydro-α-(4-nitrophenyl)-4-oxazolemethanol with Borane in THF. The borane modified by chiral oxazoborolidine enantioselectively... Chiral oxazoborolidine borane complex was prepared from (αs, 4s)-2-dichloromethyl-4, 5-dihydro-α-(4-nitrophenyl)-4-oxazolemethanol with Borane in THF. The borane modified by chiral oxazoborolidine enantioselectively reduced aromatic ketones to second-alcohol with about 95%yield and medium optical yields. In the end of article, results are discussed and reduction mechanism is shown which proves the resulting major isomers fit very well. 展开更多
关键词 asymmetric reduction prochiral ketones chiral oxazoborolidine borane CHLORAMPHENICOL OXAZOLINE
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Development of a surface plasmon resonance biosensor for accurate and sensitive quantitation of small molecules in blood samples
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作者 Minyu Qi Diya Lv +7 位作者 Ying Zhang Dongyao Wang Xiaofei Chen Zhenyu Zhu Zhanying Hong Yifeng Chai Hai Zhang Yan Cao 《Journal of Pharmaceutical Analysis》 SCIE CAS CSCD 2022年第6期929-936,共8页
Therapeutic drug monitoring(TDM)has played an important role in clinical medicine for precise dosing.Currently,chromatographic technology and immunoassay detection are widely used in TDM and have met most of the needs... Therapeutic drug monitoring(TDM)has played an important role in clinical medicine for precise dosing.Currently,chromatographic technology and immunoassay detection are widely used in TDM and have met most of the needs of clinical drug therapy.However,some problems still exist in practical applications,such as complicated operation and the influence of endogenous substances.Surface plasmon resonance(SPR)has been applied to detect the concentrations of small molecules,including pesticide residues in crops and antibiotics in milk,which indicates its potential for in vivo drug detection.In this study,a new SPR-based biosensor for detecting chloramphenicol(CAP)in blood samples was developed and validated using methodological verification,including precision,accuracy,matrix effect,and extraction recovery rate,and compared with the classic ultra-performance liquid chromatographyultraviolet(UPLC-UV)method.The detection range of SPR was 0.1-50 ng/mL and the limit of detection was 0.099±0.023 ng/mL,which was lower than that of UPLC-UV.The intra-day and inter-day accuracies of SPR were 98%-114% and 110%-122%,which met the analysis requirement.The results show that the SPR biosensor is identical to UPLC-UV in the detection of CAP in rat blood samples;moreover,the SPR biosensor has better sensitivity.Therefore,the present study shows that SPR technology can be used for the detection of small molecules in the blood samples and has the potential to become a method for therapeutic drug monitoring. 展开更多
关键词 Surface plasmon resonance UPLC-UV CHLORAMPHENICOL Methodological verification
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Effects of chloramphenicol preconditioning on oxidative respiratory function of cerebral mitochondria in rats exposed to acute hypoxia
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作者 陈丽峰 柳君泽 +1 位作者 党永明 宋熔 《Journal of Medical Colleges of PLA(China)》 CAS 2004年第2期76-80,共5页
Objective: To investigate the roles of chloramphenicol (CAP) preconditioning in the oxidative respiratory function of cerebral mitochondria in rats exposed to acute hypoxia during acute hypoxia by observing the change... Objective: To investigate the roles of chloramphenicol (CAP) preconditioning in the oxidative respiratory function of cerebral mitochondria in rats exposed to acute hypoxia during acute hypoxia by observing the changes of mitochondrial oxidative respiratory function and cytochrome C oxidase (COX) activity. Methods: Adult male Wistar rats were randomly divided into 4 groups: control (C), medication (M), hypoxia (H), and medication plus hypoxia (MH). Rats in groups M and MH were administered by peritoneal injection of CAP (50 mg/kg) every 12 h for 7 d before decapitation, but those in groups H and MH were exposed to a hypobaric chamber simulating 5 000 m high altitude for 24 h. The rat cerebral cortex was removed and mitochondria were isolated by centrifugation. Mitochondrial respiratory function and COX activity were measured by Clark oxygen electrode. Results: Compared with Group C, Group H showed significantly elevated state 4 respiration (ST 4), decreased state 3 respiration (ST 3), and respiratory control rate (RCR) in mitochondrial respiration during acute hypoxic exposure. ST 3 in Group MH was significantly lower than that in Group C, but was not significantly different from that in Groups H and M, while ST 4 in Group MH was significantly lower than that in groups C and H. RCR in Group MH was higher than that in Group H, but lower than that in Group C. COX activity in Group H was significantly lower than that in Group C. In Group MH, COX activity increased and was higher than that in Group H, but was still lower than that in Group C. Conclusion: Acute hypoxic exposure could lead to mitochondrial respiratory dysfunction, suggesting that CAP preconditioning might be beneficial to the recovery of rat respiratory function. The change of COX activity is consistent with that of mitochondrial respiratory function during acute hypoxic exposure and CAP-administration, indicating that COX plays an important role in oxidative phosphorylation function of mitochondria from cerebral cortex of hypoxic rats. 展开更多
关键词 HYPOXIA MITOCHONDRIA cyochrome C oxidase CHLORAMPHENICOL
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Penetrating Ocular Trauma in a Goldfish Model after Chloramphenicol or Traditional Medicine Angong Niuhuang Pill Treatment: An Analysis of Retinal Responses after 7 Days
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作者 Rufina S. Y. Cheng Gigi C. T. Leung +4 位作者 Tony C. H. Chow Jocy T. C. Lee Sharon L. Y. Wu Linda S. L. Wu David T. Yew 《Open Journal of Ophthalmology》 2022年第3期294-306,共13页
Purpose: While there were numerous clinical examples of ocular damage, the histopathology of retinal responses was poorly characterized, and animal model research was limited. The consequences of retinal lesions with ... Purpose: While there were numerous clinical examples of ocular damage, the histopathology of retinal responses was poorly characterized, and animal model research was limited. The consequences of retinal lesions with traditional medicine treatment were mostly unknown. In this work, goldfish was employed as a model for penetrating injury of the eyes to study the ocular trauma with antibiotic and traditional medicine treatments. Materials and Methods: The penetration of the eyes was performed at 2mm above the midline of the limbus in the superior quadrant with an 18-gauge sterile needle, all the way to the retina but avoiding the lens while the animals were anaesthetized in water containing 100 mg/L ethyl 3-aminobenzoate methanesulfonate (MS-222). The animals were divided into three groups and received treatments of saline, chloramphenicol, and Angong Niuhuang pill (Angong) eyedrops twice a day respectively. Angong after seven days, the animals were sacrificed. Immunohistochemical evaluation of proliferative cell nuclear antigen (PCNA), brain-derived neurotrophic factor (BDNF), catalase, and cleaved caspase-3, and terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) for apoptotic cells were performed on the fish’s superior quadrants of the retinae. The whole experiment was repeated two times. Result: It was evident that both the retinae treated with chloramphenicol and Angong had fewer apoptotic cells and more proliferative cells, particularly in the cases of the Angong treatment. BDNF was in the inner nuclear layer and ganglion cell layer of all groups. In the chloramphenicol and Angong groups, some cells in the outer nuclear layer displayed BDNF. Catalase reactions confirmed equivalent findings that the treated retinae with chloramphenicol or Angong treatment had less catalase. Conclusion: Angong Niuhuang pill is a traditional medicine composite formula with antibiotic and neuroprotective effects on the brain and the eyes, and this work also pointed out its possible pharmaceutical potential. 展开更多
关键词 Ocular Trauma GOLDFISH CHLORAMPHENICOL Traditional Medicine Angonggong Niuhuang Pill
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N,O Co-Doping Enhanced Adsorption of Chloramphenicol for Highly Efficient and Robust Electrocatalytic Hydrodechlorination
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作者 Xue-Feng Cheng Qiang Cao +3 位作者 Qing Liu Hao-Yu Zhang Qing-Feng Xu Jian-Mei Lu 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2024年第20期2445-2452,共8页
Electrocatalysis technology can effectively promote the hydrodechlorination of chloramphenicol(CAP)to reduce the bio-toxicity.However,there are still some challenges such as low degradation rate and poor stability.Her... Electrocatalysis technology can effectively promote the hydrodechlorination of chloramphenicol(CAP)to reduce the bio-toxicity.However,there are still some challenges such as low degradation rate and poor stability.Here,we prepared porous N,O co-doped carbon supported Pd nanoparticles composites(Pd NPs/NO-C)for electrocatalytic degradation of CAP.The doping of N and O not only effectively enhanced the interaction between substrate and CAP,promoting the mass transfer process,but also enhanced the anchoring effect on Pd nanoparticles,avoiding the occurrence of aggregation.The prepared composites achieved removal efficiency of CAP over 99%within 1 h,and the rate constant was as high as 6.72 h^(–1),outperforming previous reported electrocatalysts.Additionally,Pd NPs/NO-C composites showed a wide range of pH tolerance,excellent ion interference resistance and long-term stability.Our work unravels the importance of mass transfer processes in solution to electrocatalytic hydrodechlorination and provides new research ideas for catalysts design. 展开更多
关键词 CHLORAMPHENICOL HYDRODECHLORINATION Electrocatalysis N O co-doped carbon Mass transfer Supported catalysts Nanoparticles Low-dimensionalmaterials
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Graphene from microwave-initiated upcycling of waste polyethylene for electrocatalytic reduction of chloramphenicol
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作者 Qiang Cao Xue-Feng Cheng +6 位作者 Jia Wang Chang Zhou Liu-Jun Yang Guan Wang Dong-Yun Chen Jing-Hui He Jian-Mei Lu 《Chinese Chemical Letters》 SCIE CAS CSCD 2024年第4期187-192,共6页
Waste polyolefin plastics, accounting for 50% of all plastic waste, represent a tremendously unexploited carbon source. Efficiently upcycling polyolefin waste into value-added carbon materials for waste water treatmen... Waste polyolefin plastics, accounting for 50% of all plastic waste, represent a tremendously unexploited carbon source. Efficiently upcycling polyolefin waste into value-added carbon materials for waste water treatment avoiding using noble metals is challenging but economically and environmentally sustainable. In this work, MAX-Ti_(3)AlC_(2) supported Fe selectively catalyzes polyolefin into few-layered graphene in 5 min under microwave treatment. Graphene and MAX supported Fe(Fe@MLC) can completely(99.9%)degrade chloramphenicol(CAP) within 60 min, retain robust after 10 cycles and work efficiently at a wide p H range(3.87–13.03), avoiding the usage of noble metal. Moreover, the electrochemical active surface area(ECSA) of Fe@MLC is 2.7 times higher than that of commercial Pt/C. This work provides a cheap and efficient catalyst that promotes deconstruction of plastic wastes and indirectly degrades antibiotics thereby realizes the treatment of waste water with waste plastic. 展开更多
关键词 MICROWAVE Ti_(3)AlC_(2) ELECTROCHEMISTRY DECHLORINATION CHLORAMPHENICOL
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Mobile mini-fluorimeter for antibiotic aptasensing based on surface-plasmonic effect of burlike nanogolds enhanced by digitized imaging diagnosis
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作者 Tiantian Man Fulin Zhu +4 位作者 Yaqi Huang Yuhao Piao Yan Su Shengyuan Deng Ying Wan 《Chinese Chemical Letters》 SCIE CAS CSCD 2024年第5期418-422,共5页
Antibiotic abuse now poses a grave threat to global ecology and bestirs public concerns about the residue issue in daily necessities.The traceability measurements along supply chain or logistic circulation have become... Antibiotic abuse now poses a grave threat to global ecology and bestirs public concerns about the residue issue in daily necessities.The traceability measurements along supply chain or logistic circulation have become increasingly essential given the labile nature of diverse synthetic residuals on site.In an attempt to answer this urgency,here a miniaturized fluorometric aptasensor prototype was contrived that catered to the point-of-care screening norm for two typical additives:chloramphenicol and enrofloxacin.The key target-indicating module worked in vitro based on the competitive binding-induced fluorescence recovery of fluorescein-labeled aptamers,which were photobleached beforehand in the format of double helix on burlike nanogold carriers.The“prickly”geometry of the latter not just enriched the capture probes at preferentially substrate-accessible spires;but also contributed to a tip-enhanced surface plasmon effect,sensitizing the signal-on during the duplex dissociation even at nanomolar threshold of the analytes.On the other hand,to encompass a full portable,a set of optical devices were mounted within a 3D-printed cartridge(adaptor)to converge the light beam and route it towards the detector,for which the smartphone camera came up in handy with a home-developed App for calibrating the emissive brightness.Enlightened by the high-dynamic-range compression,an imaging diagnostic algorithm was built in to grid and digitize each slide in the album for augmented detection performance.Thus,a novel bio-to-silico integration was invented that capable of in situ rapid reporting on the antibiotic presence with high sensitivity and selectivity.Further field practices in spiked milk on sales proved the precision and rudimentary feasibility of the well-assembled model of appliance,thus holding nice prospects in nonexpert(e.g.,family and local community)utilities for foodborne antibiotic identification. 展开更多
关键词 Chloramphenicol and enrofloxacin APTASENSOR Gold nanoburs Smartphone fluorimetric suite Digitized image postprocessing
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