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Antimicrobial and synergistic effects of lemongrass and geranium essential oils against Streptococcus mutans,Staphylococcus aureus,and Candida spp.
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作者 Patrícia Michelle Nagai de Lima Thaís Cristine Pereira +6 位作者 Lara Steffany de Carvalho Letícia Ferreira dos Santos Carlos Eduardo Rocha Oliveira Lucas de Paula Ramos Maria Cristina Marcucci Amjad Abu Hasna Luciane Dias de Oliveira 《World Journal of Critical Care Medicine》 2024年第3期63-74,共12页
BACKGROUND The oral cavity harbors more than 700 species of bacteria,which play crucial roles in the development of various oral diseases including caries,endodontic infection,periodontal infection,and diverse oral di... BACKGROUND The oral cavity harbors more than 700 species of bacteria,which play crucial roles in the development of various oral diseases including caries,endodontic infection,periodontal infection,and diverse oral diseases.AIM To investigate the antimicrobial action of Cymbopogon Schoenanthus and Pelargonium graveolens essential oils against Streptococcus mutans,Staphylococcus aureus,Candida albicans,Ca.dubliniensis,and Ca.krusei.METHODS Minimum microbicidal concentration was determined following Clinical and Laboratory Standards Institute documents.The synergistic antimicrobial activity was evaluated using the Broth microdilution checkerboard method,and the antibiofilm activity was evaluated with the 3-[4,5-dimethylthiazol-2-yl]-2,5 diphenyl tetrazolium bromide assay.Data were analyzed by one-way analysis of variance followed by the Tukey post-hoc test(P≤0.05).RESULTS C.schoenanthus and P.graveolens essential oils were as effective as 0.12%chlorhexidine against S.mutans and St.aureus monotypic biofilms after 24 h.After 24 h P.graveolens essential oil at 0.25%was more effective than the nystatin group,and C.schoenanthus essential oil at 0.25%was as effective as the nystatin group.CONCLUSION C.schoenanthus and P.graveolens essential oils are effective against S.mutans,St.aureus,Ca.albicans,Ca.dubliniensis,and Ca.krusei at different concentrations after 5 min and 24 h. 展开更多
关键词 Antifungal effect LEMONGRASS GERANIUM candida albicans candida dubliniensis candida krusei Staphylococcus aureus Streptococcus mutans
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雌激素和Candidalysin在外阴阴道念珠菌病中的研究进展
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作者 夏婷婷 黄怀球 《中山大学学报(医学科学版)》 CAS CSCD 北大核心 2024年第5期677-682,共6页
外阴阴道念珠菌病(VVC)主要由白念珠菌(CA)引起。增加外周血雌激素水平如怀孕、口服避孕药的使用和激素替代疗法等增加VVC易感性。雌激素可通过调控CA菌丝生长、宿主固有免疫细胞和阴道上皮细胞的免疫功能等多种方式影响VVC进展,但具体... 外阴阴道念珠菌病(VVC)主要由白念珠菌(CA)引起。增加外周血雌激素水平如怀孕、口服避孕药的使用和激素替代疗法等增加VVC易感性。雌激素可通过调控CA菌丝生长、宿主固有免疫细胞和阴道上皮细胞的免疫功能等多种方式影响VVC进展,但具体机制仍不清楚。Candidalysin(CL)是一种对黏膜感染至关重要的真菌肽毒素,在CA感染中起着重要作用。CL由ECE1基因编码,雌激素调控ECE1表达。本文就雌激素和CL与VVC之间相关性进行综述,为进一步明确雌激素和CL在VVC发病机制中的作用提供参考。 展开更多
关键词 白念珠菌 外阴阴道念珠菌病 雌激素 candidalysin 炎症
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Ability of Helicobacter pylori to internalize into Candida
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作者 Zheng-Hong Chen Jian-Chao Sun +1 位作者 Ting-Xiu Yang Gu-Zhen Cui 《World Journal of Gastroenterology》 SCIE CAS 2024年第16期2281-2284,共4页
The following are our views regarding the“letter to the editor”(Helicobacter is preserved in yeast vacuoles!Does Koch’s postulates confirm it?)by Alipour and Gaeini,and the response“letter to the editor”(Candida ... The following are our views regarding the“letter to the editor”(Helicobacter is preserved in yeast vacuoles!Does Koch’s postulates confirm it?)by Alipour and Gaeini,and the response“letter to the editor”(Candida accommodates nonculturable Helicobacter pylori in its vacuole-Koch’s postulates aren’t applicable)by Siavoshi and Saniee.Alipour and Gaeini rejected the methods,results,discussion,and conclusions summarized in a review article by Siavoshi and Saniee.The present article reviews and discusses evidence on the evolutionary adaptation of Helicobacter pylori(H.pylori)to thrive in Candida cell vacuoles and concludes that Candida could act as a Trojan horse,transporting potentially infectious H.pylori into the stomach of humans. 展开更多
关键词 Helicobacter pylori candida yeast Intracellular presence Helicobacter pylori-specific gene Helicobacter pylori transmission
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Single-cell transcriptomics reveals T-cell heterogeneity and immunomodulatory role of CD4^(+) T native cells in Candida albicans infection
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作者 KERAN JIA YANHAO ZHANG +8 位作者 MENGYU JIANG MENGGE CUI JIA WANG JIAJIA ZHANG HUIHAI ZHAO MENGYAN LI HUA WANG QUANMING ZOU HAO ZENG 《BIOCELL》 SCIE 2024年第9期1355-1368,共14页
Objective:Candida albicans is a common fungal pathogen that triggers complex host defense mechanisms,including coordinated innate and adaptive immune responses,to neutralize invading fungi effectively.Exploring the im... Objective:Candida albicans is a common fungal pathogen that triggers complex host defense mechanisms,including coordinated innate and adaptive immune responses,to neutralize invading fungi effectively.Exploring the immune microenvironment has the potential to inform the development of therapeutic strategies for fungal infections.Methods:The study analyzed individual immune cell profiles in peripheral blood mononuclear cells from Candida albicans-infected mice and healthy control mice using single-cell transcriptomics,fluorescence quantitative PCR,and Western blotting.We investigated intergroup differences in the dynamics of immune cell subpopulation infiltration,pathway enrichment,and differentiation during Candida albicans infection.Results:Our findings indicate that infiltration of CD4^(+)naive cells,regulatory T(Treg)cells,and Microtubules(MT)-associated cells increased after infection,along with impaired T cell activity.Notably,CD4^(+) T cells and plasma cells were enhanced after infection,suggesting that antibody production is dependent on T cells.In addition,we screened 6 hub genes,transcription factor forkhead box protein 3(Foxp3),cytotoxic T-lymphocyte associated protein 4(CTLA4),Interleukin 2 Receptor Subunit Beta(Il2rb),Cd28,C-C Motif Chemokine Ligand 5(Ccl5),and Cd27 for alterations associated with CD4^(+) T cell differentiation.Conclusions:These results provide a comprehensive immunological landscape of the mechanisms of Candida albicans infection and greatly advance our understanding of adaptive immunity in fungal infections. 展开更多
关键词 candida albicans Single-cell transcriptomics Immune microenvironment Fungal infections Hub gene
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Epidemiology, Clinical Features and Antifungal Resistance Profile of Candida auris in Africa: Systematic Review
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作者 Isidore Wendkièta Yerbanga Seydou Nakanabo Diallo +8 位作者 Toussaint Rouamba Delwendé Florence Ouedraogo Katrien Lagrou Rita Oladele Jean-Pierre Gangneux Olivier Denis Hector Rodriguez-Villalobos Isabel Montesinos Sanata Bamba 《Journal of Biosciences and Medicines》 2024年第1期126-149,共24页
Candida auris since it discovery in 2009 is becoming a severe threat to human health due to its very quickly spread, its worldwide high resistance to systemic antifungal drugs. In resource-constrained settings where s... Candida auris since it discovery in 2009 is becoming a severe threat to human health due to its very quickly spread, its worldwide high resistance to systemic antifungal drugs. In resource-constrained settings where several conditions are met for its emergence and spread, this worrisome fungus could cause large hospital and/or community-based outbreaks. This review aimed to summarize the available data on C. auris in Africa focusing on its epidemiology and antifungal resistance profile. Major databases were searched for articles on the epidemiology and antifungal resistance profile of C. auris in Africa. Out of 2,521 articles identified 22 met the inclusion criteria. In Africa, nearly 89% of African countries have no published data on C. auris. The prevalence of C. auris in Africa was 8.74%. The case fatality rate of C. auris infection in Africa was 39.46%. The main C. auris risk factors reported in Africa were cardiovascular disease, renal failure, diabetes, HIV, recent intake of antimicrobial drugs, ICU admissions, surgery, hemodialysis, parenteral nutrition and indwelling devices. Four phylogenetic clades were reported in Africa, namely clades I, II, III and IV. Candida auris showed a pan-African very high resistance rate to fluconazole, moderate resistance to amphotericin B, and high susceptibility to echinocandins. Finally, C. auris clade-specific mutations were observed within the ERG2, ERG3, ERG9, ERG11, FKS1, TAC1b and MRR1 genes in Africa. This systematic review showed the presence of C. auris in the African continent and a worrying unavailability of data on this resilient fungus in most African countries. 展开更多
关键词 AFRICA Antifungal Resistance candida auris Clinical Features Phylogenetic Clades
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One Step Multiplex PCR for Identification of Candida haemulonii complex and Candia auris
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作者 Mana Fuchigami Osamu Tsuzukibashi +12 位作者 Akira Fukatsu Koji Umezawa Sachiyo Hayashi Yuji Takahashi Hiroshi Yamamoto Chiaki Komine Mio Hagiwara-Hamano Yukiko Iizuka Satoshi Uchibori Masanobu Wakami Hiroshi Murakami Taira Kobayashi Masahiko Fukumoto 《Advances in Microbiology》 2023年第12期602-613,共12页
Purpose: Recently, Candida haemulonii complex (Candida haemulonii, Candida duobushaemulonii and Candida haemulonii var. vulnera) and two genetically close species (Candida pseudohaemulonii and Candida auris) have emer... Purpose: Recently, Candida haemulonii complex (Candida haemulonii, Candida duobushaemulonii and Candida haemulonii var. vulnera) and two genetically close species (Candida pseudohaemulonii and Candida auris) have emerged as an opportunistic fungal pathogen associated with various infectious diseases of humans, and most of those isolates have displayed antifungal resistance. Because it is difficult to differentiate these microorganisms by a current technique, unfortunately, it is important to establish a method for identifying them accurately. The purpose of the present study was to design species-specific primers in order to identify and detect C. auris, C. pseudohaemulonii, and C. haemulonii complex, i.e. , C. haemulonii, C. duobushaemulonii and C. haemulonii var. vulnera using a multiplex PCR. Methods: Polymerase chain reaction (PCR) primers were designed based on partial sequences of the 26S rRNA, 18S rRNA, and RPB1 genes and ITS region of five Candida species. Results: The multiplex PCR method developed in this study was able to distinguish five Candida species clearly. Conclusion: Our developed one-step multiplex PCR method is accurate, specific, cost-effective, time-saving, and works without requiring DNA extraction. 展开更多
关键词 Genus candida candida haemulonii complex Multiplex PCR candida auris
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Candida endocarditis: Update on management considerations
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作者 Yasser Jamil Akintayo Akinleye +3 位作者 Mojtaba Mirzaei Matthew Lempel Kassem Farhat Samuel Pan 《World Journal of Cardiology》 2023年第10期469-478,共10页
The rise in incidence rates of invasive candidiasis warrants an increase in atten-tion and efforts toward preventing and treating this virulent infection.Cardiac involvement is one of the most feared sequelae and has ... The rise in incidence rates of invasive candidiasis warrants an increase in atten-tion and efforts toward preventing and treating this virulent infection.Cardiac involvement is one of the most feared sequelae and has a poor prognosis.Despite the introduction of several novel antifungal agents over the past quarter century,complications and mortality rates due to Candida endocarditis have remained high.Although fungal endocarditis has a mechanism similar to bacterial endocar-ditis,no specific diagnostic criteria or algorithm exists to help guide its manage-ment.Furthermore,recent data has questioned the current guidelines recommen-ding a combined approach of antifungal agents with surgical valve or indwelling prostheses removal.With the emergence of multidrug-resistant Candida auris,a focus on improved prophylactic measures and management strategies is nece-ssary. 展开更多
关键词 candida candida endocarditis Fungal endocarditis Invasive fungal infection
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基于代谢组学和转录组学揭示郫县豆瓣中两株优势产风味菌株Bacillus amyloliquefaciens与Candida versatilis互作机制
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作者 刘欣宁 卢云浩 何强 《中国调味品》 CAS 北大核心 2023年第11期67-74,共8页
为揭示郫县豆瓣内源性优势菌株Bacillus amyloliquefaciens与Candida versatilis的互作机制,文章基于非靶向代谢组学和转录组学技术,探究了两株菌在单独培养和共培养体系下代谢物和基因表达水平的差异。结果表明,与单独培养B.amylolique... 为揭示郫县豆瓣内源性优势菌株Bacillus amyloliquefaciens与Candida versatilis的互作机制,文章基于非靶向代谢组学和转录组学技术,探究了两株菌在单独培养和共培养体系下代谢物和基因表达水平的差异。结果表明,与单独培养B.amyloliquefaciens与C.versatilis相比,共培养体系下分别有193种和297种显著差异代谢物,集中在脂类和类脂分子、有机酸及其衍生物、氨基酸及其衍生物等。通过转录组学和差异代谢通路分析,B.amyloliquefaciens在共培养体系下上调表达基因801个,集中在生物过程中;而下调表达基因805个,以分子功能为主。C.versatilis对B.amyloliquefaciens的生长代谢具有双向作用,其中糖酵解/糖异生、脂肪酸降解等途径显著增强,而脂肪酸合成、氨基酸相关代谢显著减弱。研究结果可揭示两株菌的互作机制,并为改善郫县豆瓣风味及品质提供理论指导。 展开更多
关键词 代谢组学 转录组学 Bacillus amyloliquefaciens candida versatilis 互作机制
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Conjugation of Candida rugosa lipase with hydrophobic polymer improves esterification activity of vitamin E in nonaqueous solvent
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作者 Xiaoyun Hou Qinghong Shi 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2023年第10期182-191,共10页
We described a novel polymer-lipase conjugate for high-efficient esterification of vitamin E using vitamin E and succinic anhydride as the substrates in nonaqueous media.In this work,the monomer,N-isopropylacrylamide(... We described a novel polymer-lipase conjugate for high-efficient esterification of vitamin E using vitamin E and succinic anhydride as the substrates in nonaqueous media.In this work,the monomer,N-isopropylacrylamide(NIPAM),was grafted onto Candida rugosa lipase(CRL)to synthesize poly(NIPAM)(pNIPAM)-CRL conjugate by atom transfer radical polymerization via the initiator coupled on the surface of CRL.The result showed that the catalytic efficiencies of pNIPAM-CRL conjugates(19.5-30.3 L·s^(-1)·mmol^(-1))were at least 7 times higher than that of free CRL(2.36 L·s^(-1)·mmol^(-1))in DMSO.It was attributed to a significant increase in Kcat of the conjugates in nonaqueous media.The synthesis catalyzed by pNIPAM-CRL co njugates was influenced by the length and density of the grafted polymer,water content,solvent polarity and molar ratio of the substrates.In the optimal synthesis,the reaction time was shortened at least 7 times,and yields of vitamin E succinate by pNIPAM-g-CRL and free CRL were obtained to be 75.4%and 6.6%at 55℃after the reaction for 1.5 h.The result argued that conjugation with pNIPAM induced conformational change of the lid on CRL based on hydrophobic interaction,thus providing a higher possibility of catalysis-favorable conformation on CRL in nonaqueous media.Moreover,pNIPAM conjugation improved the thermal stability of CRL greatly,and the stability improved further with an increase of chain length of pNIPAM.At the optimal reaction conditions(55℃and 1.5 h),pNIPAM-g-CRL also exhibited good reusability in the enzymatic synthesis of vitamin E succinate and kept~70%of its catalytic activity after ten consecutive cycles.The research demonstrated that pNIPAM-g-CRL was a more competitive biocatalyst in the enzymatic synthesis of vitamin E succinate and exhibited good application potential under harsh industrial conditions. 展开更多
关键词 candida rugosa lipase POLYMERS BIOCATALYSIS ESTERIFICATION Vitamin E succi
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Anticandidal Activity of Moroccan Medicinal Plants
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作者 Khadija El Assraoui Tarik Rochd 《Journal of Biosciences and Medicines》 2023年第7期79-95,共17页
The prevalence of oral candidiasis has increased over recent years in patients with the compromised general condition. There are a large number of plant species that have been traditionally used for oral diseases by t... The prevalence of oral candidiasis has increased over recent years in patients with the compromised general condition. There are a large number of plant species that have been traditionally used for oral diseases by the Moroccan population. These species could provide a source for discovering new active principles of natural origin against Candida albicans involved in the appearance of candidiasis infections. Information was acquired using the electronic databases Web of Science, Scopus and PubMed. In the first part, this review presents the medicinal plants used by the Moroccan population for the treatment of oral disorders (Toothaches, gingivitis, ulcers, stomatitis, abscesses, ...). The second part describes different studies regarding the antifungal activity of essential oils and organic extracts of some Moroccan species against Candida albicans. Inhibition zone diameter (IZD), Minimum inhibitory concentration (MIC) and minimum fungicidal concentration (MFC) values of essential oils and plant’s extracts were noted. The third part concerns Moroccan plants with the antifungal activity that can be used in medical and agricultural fields. Several species of Moroccan plant proved their effectiveness against Candida albicans and can be used for the treatment of oral candidiasis. Further research should be undertaken in the future to investigate the toxicity of essential oils and plant extracts with antifungal properties for clinical use. This review provided an update on Moroccan plants presenting antifungal activity and especially those active against Candida albicans. 展开更多
关键词 Oral Candidiasis ANTIFUNGAL Moroccan Plants candida albicans Essential Oil Plant Extracts
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Efficacy and safety of local candida immunotherapy in recalcitrant warts in pediatric kidney transplantation:A case report
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作者 Ratna Acharya Rachel Bush +1 位作者 Felicia Johns Kiran Upadhyay 《World Journal of Transplantation》 2023年第4期201-207,共7页
BACKGROUND Warts are common in recipients of kidney transplantation(KT).Resistant warts which are not amenable to conventional therapies may lead to significant morbidity.Limited data exists on safety and efficacy of ... BACKGROUND Warts are common in recipients of kidney transplantation(KT).Resistant warts which are not amenable to conventional therapies may lead to significant morbidity.Limited data exists on safety and efficacy of local immunotherapy among immunocompromised KT recipients.CASE SUMMARY We report a seven-year-old child who presented with recalcitrant plantar periungual warts in the early KT period.Immunosuppression consisted of tacrolimus,mycophenolate and steroid.Due to failure of conventional anti-wart therapies,he was treated with two sessions of intralesional(IL)candida immunotherapy along with liquid nitrogen cryotherapy leading to complete resolution of the warts.Interestingly,de novo BK viremia was seen about three weeks following the last candida immunotherapy.This required reduction of immunosuppression and other anti-BK viral therapies.Allograft function remained stable but there were donor specific antibodies detected.There also was elevated level of plasma donor derived cell-free DNA.A pneumocystis jirovecii pneumonia occurred ten months following completion of immunotherapy that was successfully treated with trimethoprim-sulfamethoxazole.During this ten-month follow-up period,there have been no recurrence of warts,and transplant kidney function has remained stable.CONCLUSION Stimulation of cell-mediated immunity against the human papilloma virus induced by the IL candida immunotherapy is thought to be a cause for wart resolution.With this therapy,whether it is necessary to augment the immunosuppression to prevent rejection is unclear as that may come with a risk of infectious complications.Larger,prospective studies in pediatric KT recipients are needed to explore these important issues. 展开更多
关键词 WARTS Kidney transplantation candida IMMUNOTHERAPY PEDIATRIC Case report
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Commensal Oral Candida in Asian Cohorts 被引量:2
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作者 Lakshman Samaranayake 《International Journal of Oral Science》 SCIE CAS CSCD 2009年第1期2-5,共4页
Samaranayake L. Commensal Oral Candida in Asian Cohorts. International Journal of Oral Science, 1 (1): 2-5, 2009The oral carriage rate of Candida in healthy humans ranges from 40% to 60%. However for a prolonged pe... Samaranayake L. Commensal Oral Candida in Asian Cohorts. International Journal of Oral Science, 1 (1): 2-5, 2009The oral carriage rate of Candida in healthy humans ranges from 40% to 60%. However for a prolonged period, the oral candidal prevalence in humans was documented essentially using data from studies in the West as their prevalence in inhabitants in different regions of the world,including Asia was not known. Yet, recent reports from a number of studies indicate the quality, quantity and prevalence of oral yeasts differ between Asia and other regions for reason that are still unclear. This mini review on such data from Asian studies on oral carriage of Candida provides another intriguing facet of the behavior of this ubiquitous yeast. 展开更多
关键词 candida commensal oral candida oralcandidal prevalence Asian cohorts
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Candida glycerinogenes基因组大片段缺失菌的构建及表征
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作者 李沁 李海铭 +2 位作者 陆信曜 宗红 诸葛斌 《食品与发酵工业》 CAS CSCD 北大核心 2023年第3期1-8,共8页
通过基因组精简可获得代谢背景降低、更适用于工业生物技术的底盘细胞。产甘油假丝酵母(Candida glycerinogenes)是具有优良抗逆性能的工业菌株,对其基因组进行精简以获得更优的底盘化细胞。以CRISPR/Cas9为工具进行C.glycerinogenes基... 通过基因组精简可获得代谢背景降低、更适用于工业生物技术的底盘细胞。产甘油假丝酵母(Candida glycerinogenes)是具有优良抗逆性能的工业菌株,对其基因组进行精简以获得更优的底盘化细胞。以CRISPR/Cas9为工具进行C.glycerinogenes基因组非必需DNA大片段删除,实现了25、50 kb片段的敲除,并研究了缺失菌的耐受性和发酵特性。结果显示,片段删除菌株的胁迫耐受能力无明显改变,30℃下Δ7.8 kb菌生物量降低20%,42℃下Δ7.8 kb、Δ25 kb菌的生物量下降20%。而在发酵过程中各缺失菌均表现出生物量降低20%,其中Δ7.8 kb菌株表现出了发酵初生物量提高了14%、单位菌体甘油产量提高了22%,还原力相关基因G6PD、6PGDH分别上调10倍和29倍,NADPH/NADP+值提高了100%。结果表明,上述非必需DNA大片段删除对C.glycerinogenes耐受特性无明显影响,而会导致生物量降低和单位菌体甘油产量提高,缺失菌株可能因基因表达水平的差异而与野生菌株在性状上产生区别。该研究是对CRISPR/Cas9系统在C.glycerinogenes中的潜力挖掘,有助于推进该非模式工业菌株底盘化进程和应用。 展开更多
关键词 基因组精简 底盘细胞 产甘油假丝酵母 CRISPR/Cas9 基因组大片段编辑 生理表征
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高浓度苯酚降解菌Candida tropicalis Z-04的鉴定及其对苯酚降解条件的优化 被引量:10
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作者 周江亚 李娟 +1 位作者 于晓娟 蔡伟民 《环境污染与防治》 CAS CSCD 北大核心 2011年第2期12-17,22,共7页
从降解苯酚的好氧颗粒污泥中筛选出一株苯酚降解菌,该菌株最高可耐受2.0 g/L的苯酚。依据形态特征和内源转录间隔区(ITS)的核酸序列分析,将该菌株鉴定为热带假丝酵母菌(Candida tropicalis),并命名为Candida tropicalis Z-04。采用中心... 从降解苯酚的好氧颗粒污泥中筛选出一株苯酚降解菌,该菌株最高可耐受2.0 g/L的苯酚。依据形态特征和内源转录间隔区(ITS)的核酸序列分析,将该菌株鉴定为热带假丝酵母菌(Candida tropicalis),并命名为Candida tropicalis Z-04。采用中心复合设计(CCD)法对Candida tropicalis Z-04降解苯酚的条件进行合理设计,利用Design-Expert软件对试验数据进行分析,考察了各因素及其交互作用对苯酚降解率的影响,并得到苯酚最佳降解条件。结果表明,Candida tropicalis Z-04降解苯酚的最佳条件为:酵母提取物投加量0.41 g/L,苯酚初始质量浓度1.03 g/L,菌种投加量1.43%(体积分数),温度30.04℃。在此条件下苯酚的理论预测降解率可达到最大值99.10%。 展开更多
关键词 candida TROPICALIS Z-04 苯酚 降解 优化
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界面活化的溶胶凝胶包埋Candida rugosa脂肪酶催化合成维生素E琥珀酸酯 被引量:7
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作者 胡燚 蒋相军 +2 位作者 吴素文 江凌 黄和 《催化学报》 SCIE EI CAS CSCD 北大核心 2013年第8期1608-1616,共9页
采用界面活化的溶胶凝胶包埋Candida rugosa脂肪酶(CRL)催化合成了维生素E琥珀酸酯. 考察了影响溶胶凝胶包埋固定化CRL的因素, 获得的最佳固定化条件为: 丙基三甲氧基硅烷/正硅酸四乙酯摩尔比为1/1, 水与硅烷前体摩尔比为15, 酶的添加量... 采用界面活化的溶胶凝胶包埋Candida rugosa脂肪酶(CRL)催化合成了维生素E琥珀酸酯. 考察了影响溶胶凝胶包埋固定化CRL的因素, 获得的最佳固定化条件为: 丙基三甲氧基硅烷/正硅酸四乙酯摩尔比为1/1, 水与硅烷前体摩尔比为15, 酶的添加量为0.5mg/ml, PEG400的添加量为12μl/ml溶胶. 溶胶凝胶包埋的CRL在50℃, 18h后其活性仍然保持了70.58%, 是游离酶的2.6倍,且稳定性得到了明显的改善. 基于CRL的界面特性, 采用五种表面活性剂对其进行界面活化. 结果表明, 采用橄榄油活化的溶胶凝胶包埋的CRL合成维生素E琥珀酸酯的酯化活力最高, 相比原酶和未界面活化的溶胶凝胶包埋酶分别提高了6.7和1.43倍. 展开更多
关键词 溶胶凝胶 界面活化 candida rugosa脂肪酶 维生素E琥珀酸酯
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土壤弹尾目昆虫Folsomia candida对铜污染的急性毒理初步研究 被引量:11
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作者 李晓勇 骆永明 +1 位作者 柯欣 孙明明 《土壤学报》 CAS CSCD 北大核心 2011年第1期197-201,共5页
随着土壤环境重金属污染的加剧,有关重金属污染土壤的风险评估受到关注。对土壤质量评价的方法长期以来集中在检测重金属污染物质在土壤中的浓度及化学形态等方面,而对于重金属、土壤和生物之间的相互作用很少考虑,因而难以全面评估... 随着土壤环境重金属污染的加剧,有关重金属污染土壤的风险评估受到关注。对土壤质量评价的方法长期以来集中在检测重金属污染物质在土壤中的浓度及化学形态等方面,而对于重金属、土壤和生物之间的相互作用很少考虑,因而难以全面评估重金属对土壤环境的生态毒性效应。重金属污染土壤的生物评价是对化学评价的有效补充和相互验证。 展开更多
关键词 白符跳(Folsomia candida) 急性毒性 土壤
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不同渗透压调节剂对Candida krusei生理代谢的影响 被引量:7
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作者 刘宏娟 刘德华 钟建江 《微生物学通报》 CAS CSCD 北大核心 2005年第6期32-36,共5页
比较了氯化钠、氯化钾、甘露醇存在的高渗环境下克鲁氏假丝酵母(Candida kru-sei)的生理代谢。3种渗透压调节剂对C.krusei生理代谢影响有显著差异。与甘露醇相比,氯化钠和氯化钾对细胞生长的影响更为显著,而氯化钾对细胞的毒性则又小于... 比较了氯化钠、氯化钾、甘露醇存在的高渗环境下克鲁氏假丝酵母(Candida kru-sei)的生理代谢。3种渗透压调节剂对C.krusei生理代谢影响有显著差异。与甘露醇相比,氯化钠和氯化钾对细胞生长的影响更为显著,而氯化钾对细胞的毒性则又小于氯化钠。细胞对糖的消耗速率依次为甘露醇>氯化钾>氯化钠。甘油和海藻糖是C.krusei在高渗环境下的主要相容性溶质。氯化钠和氯化钾对甘油合成的促进作用明显高于甘露醇。在0.6mol/L氯化钠、氯化钾、甘露醇存在时,细胞甘油浓度较对照提高了74%、63%、57%;胞内甘油最大含量也分别达到对照的3.1,2.4和1.8倍。高渗环境下胞内海藻糖含量在发酵前期均有所降低,但发酵后期在0.6mol/L氯化钾和甘露醇存在时海藻糖迅速积累,其含量分别达对照的1.6和1.4倍。 展开更多
关键词 candida krusei 甘油 海藻糖 高渗胁迫
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Candida sp.99-125脂肪酶催化猪油酸解合成1,3-二油酸-2-棕榈酸甘油三酯 被引量:6
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作者 李昕倩 邓利 +3 位作者 叶贤春 聂开立 刘珞 李玲 《生物加工过程》 CAS CSCD 2013年第3期13-17,共5页
人乳脂是一种在甘油骨架Sn-2位上富含棕榈酸(C16∶0)的结构酯。经分析可知,猪油中棕榈酸主要分布在甘油酯的Sn-2位,可作为制备1,3-二油酸-2-棕榈酸甘油三酯(OPO)的原料。以Candida sp.99-125脂肪酶作催化剂,以猪油和油酸为原料,通过正... 人乳脂是一种在甘油骨架Sn-2位上富含棕榈酸(C16∶0)的结构酯。经分析可知,猪油中棕榈酸主要分布在甘油酯的Sn-2位,可作为制备1,3-二油酸-2-棕榈酸甘油三酯(OPO)的原料。以Candida sp.99-125脂肪酶作催化剂,以猪油和油酸为原料,通过正交试验对无溶剂体系中酸解合成OPO的工艺条件进行研究,得到最适反应条件:猪油与油酸的质量比为1∶2.0,酶用量为总底物质量的10%,反应温度40℃,反应时间4 h。在该反应条件下,经酸解合成的产物三甘酯中,Sn-2C16∶0的含量大于70%,占总脂肪酸中棕榈酸含量的93%以上,并含有43%以上的OPO。 展开更多
关键词 candida SP 99—125脂肪酶 1 3-二油酸-2-棕榈酸甘油三酯 猪油
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酵母Candida krusei对合成染料的脱色 被引量:14
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作者 余志晟 文湘华 《环境科学》 EI CAS CSCD 北大核心 2005年第5期137-142,共6页
通过筛选实验,从土壤中新分离到1株对活性艳红K-2BP具有明显脱色效果的酵母菌株Y-G-1,经鉴定为克鲁斯假丝酵母Candida krusei.该菌株对含活性艳红K-2BP起始浓度为200mg/L的培养基,最大脱色率为99%,达到最大脱色率的时间是12 h.克鲁斯假... 通过筛选实验,从土壤中新分离到1株对活性艳红K-2BP具有明显脱色效果的酵母菌株Y-G-1,经鉴定为克鲁斯假丝酵母Candida krusei.该菌株对含活性艳红K-2BP起始浓度为200mg/L的培养基,最大脱色率为99%,达到最大脱色率的时间是12 h.克鲁斯假丝酵母的最佳接种量应不低于5%(体积分数),培养基最适pH在4~9之间,氮源(NH4)2SO4浓度不低于0.1%,相对应的碳源葡萄糖浓度不低于0.5%.对脱色机理的研究表明,该菌株对活性艳红K-2BP的去除属于降解脱色.此外,该菌株对另外9种染料(50mg/L)的脱色率在62%~96%之间.其中,对偶氮染料弱酸艳红B、活性黑KN-B和活性红M-3BE的脱色率都达到了90%以上,对三苯甲烷染料(酸性媒介漂蓝B)的脱色率达到了93%.表明克鲁斯假丝酵母在染料废水的处理上可能具有较好地应用潜能. 展开更多
关键词 染料 活性艳红K-2BP candida krusei 脱色 筛选
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假丝酵母脂肪酶(Candida sp.99-125)催化合成人乳脂替代品及酶重复使用的研究 被引量:4
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作者 李玲 叶贤春 +3 位作者 邓利 聂开立 刘珞 李昕倩 《北京化工大学学报(自然科学版)》 CAS CSCD 北大核心 2012年第6期79-83,共5页
以三棕榈酸甘油酯(PPP)和油酸(O)为原料,假丝酵母脂肪酶(Candida sp.99-125)为催化剂合成人乳脂替代品1,3-二油酸2-棕榈酸甘油三酯(OPO)。研究了Candida sp.99-125脂肪酶的催化机理、酶使用量以及Candi-da sp.99-125脂肪酶的重复使用。... 以三棕榈酸甘油酯(PPP)和油酸(O)为原料,假丝酵母脂肪酶(Candida sp.99-125)为催化剂合成人乳脂替代品1,3-二油酸2-棕榈酸甘油三酯(OPO)。研究了Candida sp.99-125脂肪酶的催化机理、酶使用量以及Candi-da sp.99-125脂肪酶的重复使用。研究结果表明:Candida sp.99-125脂肪酶的催化机理是先酸解PPP sn-1位的棕榈酸,然后再与sn-3位的棕榈酸反应;当脂肪酶用量为37500 U,反应温度为43℃,经过3 h反应后,OPO的转化率可达41.24%;补加初次反应脂肪酶使用量50%的脂肪酶后,重新加入底物反应48 h,OPO的转化率可维持在40%左右,且平均反应速率保持稳定。 展开更多
关键词 人乳脂替代品 脂肪酶 candida SP 99-125 重复使用
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