FBRM and PVM investigations of the double feed semi-batch crystallization of 6-aminopenicillanic acid

6-Aminopenicillanic acid(6-APA)is a crucial pharmaceutical intermediate in the chemistry of semi-synthetic antibiotics.The focused beam reflectance measurement(FBRM)technology and particle vision measurement(PVM)technology were employed to the processes of online-monitoring of 6-APA crystallization behavior in a double-feeding semi-batch crystallizer.Experiments were carried out with four kinds of double-feeding policies and the results were compared with the traditional single-feeding.Records and analysis of FBRM indicated that the nucleation of double feeding policy was much higher than single policy,and chord length of 6-APA was almost determined and had little change after the nucleation peak.Ostwald ripening process had no significant effect on further growth of 6-APA crystal.PVM images showed that the crystal habit of 6-APA was continuously changed during the crystallization process.The development of(002)face in the final crystal for the five feeding policies were different.

Gossypol acetic acid regulates leukemia stem cells by degrading LRPPRC via inhibiting IL-6/JAK1/STAT3 signaling or resulting mitochondrial dysfunction

BACKGROUND Leukemia stem cells(LSCs)are found to be one of the main factors contributing to poor therapeutic effects in acute myeloid leukemia(AML),as they are protected by the bone marrow microenvironment(BMM)against conventional therapies.Gossypol acetic acid(GAA),which is extracted from the seeds of cotton plants,exerts anti-tumor roles in several types of cancer and has been reported to induce apoptosis of LSCs by inhibiting Bcl2.AIM To investigate the exact roles of GAA in regulating LSCs under different microenvironments and the exact mechanism.METHODS In this study,LSCs were magnetically sorted from AML cell lines and the CD34+CD38-population was obtained.The expression of leucine-rich pentatricopeptide repeat-containing protein(LRPPRC)and forkhead box M1(FOXM1)was evaluated in LSCs,and the effects of GAA on malignancies and mitochondrial RESULTS LRPPRC was found to be upregulated,and GAA inhibited cell proliferation by degrading LRPPRC.GAA induced LRPPRC degradation and inhibited the activation of interleukin 6(IL-6)/janus kinase(JAK)1/signal transducer and activator of transcription(STAT)3 signaling,enhancing chemosensitivity in LSCs against conventional chemotherapies,including L-Asparaginase,Dexamethasone,and cytarabine.GAA was also found to downregulate FOXM1 indirectly by regulating LRPPRC.Furthermore,GAA induced reactive oxygen species accumulation,disturbed mitochondrial homeostasis,and caused mitochondrial dysfunction.By inhibiting IL-6/JAK1/STAT3 signaling via degrading LRPPRC,GAA resulted in the elimination of LSCs.Meanwhile,GAA induced oxidative stress and subsequent cell damage by causing mitochondrial damage.CONCLUSION Taken together,the results indicate that GAA might overcome the BMM protective effect and be considered as a novel and effective combination therapy for AML.

非小细胞肺癌组织中circBIRC6、APPBP2表达及临床预后意义

目的 探讨非小细胞肺癌(NSCLC)组织中环状核糖核酸杆状病毒IAP重复序列6(circBIRC6)、β淀粉样蛋白前体蛋白结合蛋白2(APPBP2)表达及临床预后意义。方法 收集2018年6月~2020年1月90例在河北北方学院附属第一医院行手术切除的NSCLC组织及癌旁组织,采用实时荧光定量聚合酶链式反应检测circBIRC6、APPBP2表达,并分析二者与NSCLC患者临床病理特征的关系。通过Pearson相关性分析NSCLC组织中circBIRC6与APPBP2 mRNA表达的相关性,Kaplan-Meier法绘制不同表皮生长因子受体(EGFR)基因突变、TNM分期和circBIRC6、APPBP2 mRNA表达的NSCLC患者生存曲线,多因素Cox回归分析NSCLC患者预后的影响因素。结果 与癌旁组织比较,NSCLC组织中circBIRC6、APPBP2 mRNA表达升高(P<0.05)。NSCLC组织中circBIRC6与APPBP2 mRNA表达呈正相关(r=0.817,P<0.001)。NSCLC患者不同分化程度、TNM分期、淋巴结转移组织中circBIRC6、APPBP2 mRNA表达比较有差异(P<0.05)。随访3年,90例NSCLC患者总生存率为55.56%(50/90)。EGFR基因突变阳性/阴性NSCLC患者总生存率比较无差异(P>0.05);TNM分期Ⅰ~Ⅱ期NSCLC患者总生存率高于Ⅲ期NSCLC患者(P<0.05);circBIRC6、APPBP2 mRNA高表达组生存率低于circBIRC6、APPBP2 mRNA低表达组(P<0.05)。低分化、TNM分期Ⅲ期、淋巴结转移和circBIRC6≥10.97、APPBP2 mRNA≥2.48为NSCLC患者死亡的独立危险因素[OR(95%CI)=3.586(1.080~11.909)、3.632(1.193~11.057)、3.197(1.060~9.640)、3.223(1.086~9.570)、2.767(1.022~7.492)]。结论 NSCLC组织中circBIRC6、APPBP2 mRNA高表达,与分化程度、TNM分期、淋巴结转移和预后有关。

齐刺环跳穴干预坐骨神经损伤大鼠海马IL-1β、IL-6、TNF-α及GFAP表达影响的实验研究

目的 通过观察齐刺环跳穴对坐骨神经损伤大鼠海马白细胞介素-1β(Interleukin-1β,IL-1β)、白细胞介素-6(Interleukin-6,IL-6)、肿瘤坏死因子-α(Tumor Necrosis Factor-alpha, TNF-α)及胶质纤维酸性蛋白(Glial Fibrillary Acidic Protein, GFAP)表达的影响,探讨齐刺环跳穴治疗坐骨神经痛的中枢镇痛机制。方法 60只SD大鼠随机分为假手术组、模型组、齐刺组、单刺组及药物组,每组12只,采用钳夹法制备大鼠坐骨神经损伤模型。造模第2天开始进行针刺及药物干预,连续14 d。观察各组大鼠干预前后坐骨神经功能指数(Sciatic nerve Function Index, SFI)、热缩足反射潜伏期(Paw Withdrawal Latency, PWL)的变化,ELISA法检测海马组织IL-1β、IL-6、TNF-α蛋白表达水平,实时定量PCR法及免疫组化法检测海马组织GFAP表达水平。结果 干预前,与假手术组比较,其余各组大鼠PWL值、SPI值显著降低(P<0.01),与模型组比较,齐刺组干预后大鼠PWL值、SPI值显著改善(P<0.01)。ELISA法、RT-PCR法及免疫组化检测结果显示,模型组、齐刺组、单刺组、药物组IL-1β、IL-6、TNF-α、GFAP表达较假手术组显著升高(P<0.01);与模型组相比,齐刺组、单刺组、药物组IL-1β、IL-6、TNF-α、GFAP表达显著下降,齐刺组表达低于单刺组及药物组(P<0.01)。结论 齐刺环跳穴缓解坐骨神经痛的镇痛机制可能与下调海马炎症因子表达,抑制星形胶质细胞活化,从而降低中枢痛觉敏化程度有关。

Different n-6/n-3 polyunsaturated fatty acid ratios affect postprandial metabolism in normal and hypertriglyceridemic rats

Postprandial metabolism plays major roles in many pathological conditions.The n-6/n-3 polyunsaturated fatty acid(PUFA)ratio is closely related to various physiological disorders.This study aimed to investigate the effects of high fat meals with different n-6/n-3 PUFA ratios on postprandial metabolism in normal control(NC)and hypertriglyceridemia(HTG)rats.The postprandial response of triglyceride(TG)in HTG groups was higher than that in NC groups after different n-6/n-3 PUFA ratio meals.The HTG groups showed higher postprandial total cholesterol(TC)responses than NC groups after 1:1 and 20:1 ratio meals.The 5:1 n-6/n-3 PUFA ratio elicited lower postprandial responses of tumor necrosis factorα(TNF-α)than 1:1 and 10:1 ratios in HTG groups.The postprandial malondialdehyde(MDA)response was lower after a 5:1 n-6/n-3 PUFA ratio meal than 1:1 and 20:1 ratio meals in HTG groups.The 1:1 ratio resulted in a lower postprandial reactive oxygen species(ROS)level than 5:1 and 10:1 n-6/n-3 PUFA ratios in NC groups.The results showed that a low n-6/n-3 PUFA ratio improved postprandial dysmetabolism induced by a high fat meal in NC and HTG rats.A high n-6/n-3 PUFA ratio increased the difference in postprandial metabolism between NC and HTG rats.

Ellagic acid ameliorates cisplatin-induced acute kidney injury by regulating inflammation and SIRT6/TNF-α signaling

De spite cisplatin has been widely used in the treatment of various cancers,the noteworthy nephrotoxicity greatly constrained its clinical value.For this reason,finding novel targeted therapies to attenuate the nephrotoxicity of cisplatin should be pretty significant.Our previous study found that histone deacetylase sirtuin 6(SIRT6)could be an ideal target for the treatment of cisplatin-induced acute kidney injury.In this study,we explored the protective effects of ellagic acid,a natural polyphenol compound that activates SIRT6,on cisplatin-induced nephrotoxicity.Pre-treatment of ellagic acid attenuated cytotoxicity of cisplatin in primary renal cells and TCMK-1 cells.Moreover,ellagic acid ameliorated renal dysfunction,apoptosis and fibrosis induced by cisplatin in mice.Furthermore,ellagic acid reduced nephrotoxicity-associated inflammatory factor interleukin(IL)-1βand IL-6 expression both in vitro and in vivo.Mechanistically,ellagic acid reversed cisplatin-reduced SIRT6 expression and diminished cisplatin-induced tumor necrosis factor(TNF)-αexpression.And SIRT6 knockdown abrogated the protective effects of ellagic acid on cisplatin-induced cell apoptosis,indicating the renal-protective effects of ellagic acid are mainly dependent on ellagic acid-mediated SIRT6 activation.Our results provide preclinical rationale for using ellagic acid as a feasible and promising agent to ameliorate cisplatin-induced acute kidney injury,and support ellagic acid as a potential adjunctive therapy for future cancer treatment.

敲低PRDX6对利福平诱导HepG2细胞胆汁酸转运体适应性表达的影响

目的探讨敲低过氧化物还原酶-6(PRDX6)在利福平(RFP)诱导人肝癌细胞(HepG2)损伤及胆汁酸转运体适应性表达中的作用。方法将处于对数生长期的细胞均匀接种于6孔板中,使用特异PRDX6-siRNA、control-siRNA分别转染HepG2细胞构建敲低组及对照组。给予细胞100μmol/L RFP诱导24 h后,Western blot和qRT-PCR检测各组细胞PRDX6、多药耐药蛋白1(MDR1)、多药耐药相关蛋白2、3、4(MRP2、MRP3、MRP4)、Na+/牛磺胆酸协同转运蛋白(NTCP)的蛋白及基因表达水平;Annexin V-FITC/PI双染法检测各组细胞凋亡率;CCK-8法检测各组细胞增殖变化;试剂盒检测各组细胞培养上清液中细胞损伤标志物丙氨酸氨基转移酶(ALT)、天冬氨酸氨基转移酶(AST)、总胆红素(TBIL)、直接胆红素(DBIL)、总胆汁酸(TBA)相对含量变化。结果RFP可诱导HepG2细胞MRP2、MRP3、MRP4、MDR1、NTCP及PRDX6的蛋白和基因表达水平升高(P<0.05),而敲低PRDX6后,MRP2、MRP3、MRP4、MDR1、NTCP的蛋白和基因表达水平均有不同程度的降低(P<0.05)。此外,PRDX6敲低后HepG2细胞凋亡率升高(P<0.05),细胞增殖能力下降(P<0.05),细胞培养上清液中细胞损伤标志物(ALT、AST、TBIL、DBIL、TBA)水平升高(P<0.05)。结论RFP可增加HepG2细胞胆汁酸转运体及PRDX6的蛋白和基因表达量,敲低PRDX6并用RFP诱导后胆汁酸转运体的蛋白及基因表达量降低,同时细胞损伤加重,表明PRDX6在RFP诱导的HepG2细胞适应性反应中发挥保护作用。

Betulinic acid-mediating miRNA-365 inhibited the progression of pancreatic cancer

Background:The dilemma of pancreatic cancer treatment has become a global challenge.For this reason,effective,feasible,and new medical methods are currently much-needed.Betulinic acid(BA)has been valued as a potential therapy for pancreatic cancer.However,the mechanism by which BA exerts an inhibitory effect on the development of pancreatic cancer remains elusive.Methods:A rat model and two cell models of pancreatic cancer were established,and the effect of BA on pancreatic cancer was verified in vivo and in vitro by using MTT,Transwell,flow cytometry,RT-PCR,Elisa and immunohistochemistry.At the same time,miR-365 inhibitors were introduced to test whether BA played a role in mediating miR-365.Results:BA can significantly inhibit the proliferation and invasion of pancreatic cancer cells and promote apoptosis.In vivo experiments,BA can significantly lower the number of cancer cells and tumor volume in the rat model of pancreatic cancer.In vitro,it was found that BA inhibited the protein level and phosphorylation level of AKT/STAT3 by mediating the expression of miR365/BTG2/IL-6.Like BA,miR-365 inhibitors also significantly inhibited cell viability and invasion ability,and inhibited the protein level and phosphorylation level of AKT/STAT3 by changing the expression of BTG2/IL-6,and their combination had a synergistic effect.Conclusion:BA inhibits AKT/STAT3 expression and phosphorylation by modulating miR-365/BTG2/IL-6 expression,and BA inhibits the progression of pancreatic cancer through the aforementioned mechanism.

Silencing of the Nonspecific Phospholipase C6(NPC6)Gene Induces Ricinoleic Acid Accumulation in Castor Seeds

Castor,scientifically known as Ricinus communis L.,is among the top ten oil crops globally.It is considered a renewable resource and is commonly referred to as‘green oil’.Castor seeds contain castor oil as their main component,which is predominantly composed of ricinoleic acid.This study utilized RNAi technology to silence the NPC6 gene in NO.2129 castor,resulting in the creation of mutant plants L1 and L2.The weight of 100 dry seed kernels from L1 and L2 exceeds that from NO.2129.The crude fat and ricinoleic acid levels of L1 and L2 were higher than those of NO.2129 at various developmental stages.In the proteomics analysis of 60-day-old castor seeds,a total of 21 differentially expressed proteins were identified,out of which 19 were successfully recognized.Eleven of the differentially expressed proteins identified were legumins,which play a crucial role in nutrient storage within the seed.Silencing the NPC6 gene results in the accumulation of ricinoleic acid in castor seeds.The findings of this study not only enhance our knowledge of NPC6’s role in regulating castor seed oil synthesis but also offer fresh perspectives for investigating oil synthesis and accumulation in other plant species.

Q[6]-PW_(12)自组装体制备及其催化合成乙酸乙酯

以六元瓜环(Q[6])及Keggin型磷钨酸(PW_(12))为原料,制备Q[6]-PW_(12)自组装体。将Q[6]-PW_(12)自组装体作为催化剂应用于乙酸与乙醇酯化反应合成乙酸乙酯。结果表明,Q[6]与PW_(12)发生了自组装作用,且Q[6]-PW_(12)自组装体具有多孔结构特征;Q[6]-PW_(12)自组装体对酯化反应合成乙酸乙酯具有催化作用,且自组装体催化剂经过多次循环使用后依然效果良好。

血清ADMA、IL-6、内毒素及乳酸在新生儿败血症所致感染性休克中的表达及临床意义

目的探讨血清不对称二甲基精氨酸(ADMA)、白细胞介素-6(IL-6)、内毒素及乳酸在新生儿败血症所致感染性休克中的表达及临床意义。方法选取我院收治的58例新生儿败血症所致感染性休克患儿为休克组,62例新生儿败血症未发生感染性休克患儿为败血症组,60例无感染新生儿为对照组。检测所有研究对象血清中的ADMA、IL-6、内毒素及乳酸水平。比较三组研究对象的ADMA、IL-6、内毒素及乳酸水平;分析ADMA、IL-6、内毒素及乳酸水平对新生儿败血症所致感染性休克患儿的诊断价值;分析ADMA水平与IL-6、内毒素及乳酸水平的关系;分析ADMA、IL-6、内毒素及乳酸水平与休克组预后的关系。结果休克组的ADMA、IL-6、内毒素及乳酸水平均高于败血症组及对照组(P<0.05);败血症组的ADMA、IL-6、内毒素水平均高于对照组(P<0.05);败血症组和对照组的乳酸水平无显著差异(P>0.05)。受试者工作特征曲线(ROC)结果显示,ADMA、IL-6、内毒素及乳酸诊断新生儿败血症所致感染性休克的曲线下面积(AUC)分别为0.93、0.89、0.89、0.92。Pearson相关性分析结果显示,ADMA水平与IL-6、内毒素及乳酸水平呈正相关(P<0.05)。ADMA、IL-6、内毒素及乳酸高水平与新生儿败血症所致感染性休克预后不良有关。结论血清ADMA、IL-6、内毒素及乳酸在新生儿败血症所致感染性休克中表达水平较高,可作为该疾病诊断的生物标志物并预测预后。

基于IL-6/STAT3信号通路探讨山楂酸对小鼠结肠癌CT26细胞增殖、凋亡的影响

目的从IL-6/STAT3信号通路探讨山楂酸(MA)对小鼠结肠癌CT26细胞增殖、凋亡的影响。方法体外培养CT26细胞,设置空白组、10、20、30、35、40μmoL·L^(-1)MA组。干预24 h后,采用CCK-8法检测山楂酸对细胞活力的影响,采用RT-PCR检测IL-6 mRNA表达水平,采用流式细胞仪检测各组细胞凋亡率,采用Western blotting检测各组细胞中STAT3通路相关蛋白的表达水平。设置空白组、IL-6(20 ng·μL^(-1))刺激组、不同浓度MA与IL-6共刺激组,采用Western blotting检测各组细胞p-STAT3、STAT3蛋白的表达水平。设置空白组、MA组、磷酸酶抑制剂(正钒酸钠)组和MA+正钒酸钠组,采用Western blotting检测各组细胞p-STAT3、STAT3蛋白的表达水平。结果与空白组相比,CCK-8结果显示20、30、35、40、45、50μmoL·L^(-1)浓度的山楂酸均能降低CT26细胞活力(P<0.05),IC50=37.32μmoL·L^(-1);RT-PCR结果显示30、35、40μmoL·L^(-1)给药组细胞中IL-6 mRNA水平下降(P<0.05);流式细胞术结果显示30、35、40μmoL·L^(-1)给药组细胞凋亡率增加(P<0.05);Western blotting结果显示35、40μmoL·L^(-1)给药组细胞中STAT3通路相关蛋白p-STAT3、Bcl-2蛋白表达水平下降(P<0.05),MA+正钒酸钠组能恢复MA单独给药组中被降低的p-STAT3蛋白水平(P<0.05)。结论MA可能通过降低IL-6的表达水平,抑制STAT3的磷酸化,从而降低抗凋亡蛋白Bcl-2的表达,促进肿瘤细胞凋亡,抑制其增殖。

生物质植酸改性聚氨酯涂层锦纶6织物的制备及其阻燃性能

针对聚氨酯涂层锦纶6织物阻燃性能差、熔滴严重的问题,通过采用生物质植酸对水性聚氨酯进行改性,开发环保高效的阻燃体系对锦纶6织物进行涂层改性。测试分析了涂层锦纶6织物的阻燃性能、耐水洗性能、耐静水压、热稳定性和阻燃机制等。研究结果表明:聚氨酯涂层锦纶6织物在垂直燃烧测试中完全燃烧,损毁长度为30 cm,熔滴引燃脱脂棉,植酸/植酸钠改性聚氨酯涂层锦纶6织物在垂直燃烧中能够自熄,无熔滴产生,损毁长度降低至12.4 cm,极限氧指数升高至29.0%;经过10次水洗后涂层锦纶6织物仍能自熄,具有较好的阻燃性能和耐水洗性能;涂层锦纶6织物的热分解提前,经热分解后磷元素保留在残炭中,参与成炭,植酸盐主要通过固相阻燃机制提高涂层锦纶6织物的阻燃性能。

牙周组织SOCS6、RORA表达水平对牙周炎患者的预后价值

目的探讨细胞因子信号转导抑制因子6(SOCS6)和维甲酸受体相关孤核受体A(RORA)在牙周炎患者牙周组织中的表达,并分析二者对患者的预后价值。方法选取2021年7月至2023年1月在济南市中医医院接受治疗的224例牙周炎患者作为研究组,另选取224例到济南市中医医院门诊因正畸治疗需要拔除健康牙齿的患者作为对照组。收集其牙周组织并采用实时荧光定量PCR检测牙周组织中SOCS6、RORA表达水平。对牙周炎患者随访3个月,根据随访结果将其分为预后良好组(148例)与预后不良组(76例)。采用多因素Logistic回归分析牙周炎患者预后不良的影响因素,采用受试者工作特征(ROC)曲线分析牙周组织SOCS6、RORA表达水平对牙周炎患者预后不良的预测价值。结果与对照组比较,研究组牙周组织SOCS6、RORA表达水平均降低(P<0.05)。224例牙周炎患者均完成随访,预后不良发生率为33.93%(76/224)。预后不良组牙周组织SOCS6、RORA表达水平均低于预后良好组(P<0.05)。多因素Logistic回归分析显示,患牙位于下颌、患牙为前牙、患牙最深探诊深度、牙周炎严重程度为重度、根形态异常、牙槽骨高度、平均附着丧失均是导致牙周炎患者预后不良的危险因素(P<0.05),牙周组织SOCS6、RORA表达水平均是保护因素(P<0.05)。牙周组织SOCS6、RORA单独预测牙周炎患者预后不良的曲线下面积(AUC)分别为0.833、0.829,二者联合预测的AUC(0.914)高于SOCS6与RORA单独预测(Z=3.659、3.408,P<0.001)。结论牙周炎预后不良患者牙周组织SOCS6、RORA表达水平均降低,二者均对牙周炎患者预后不良具有一定预测效能,且二者联合预测的效果更优。

高油酸花生新品种浙花6号的选育及栽培技术

浙花6号是以花育52号为母本、小京生为父本组配杂交组合,杂交后代按系谱法结合多代定向筛选选育而成的高油酸花生新品种,具有高产稳产、早熟性突出、抗倒性强、适应性广等特点。该品种于2020—2021年参加浙江省区域试验,平均荚果产量4074.00 kg·hm^(-2),平均籽仁产量3040.58 kg·hm^(-2),分别比对照小京生增产36.4%和47.5%。2020年经农业农村部农产品及加工品质量安全监督检验测试中心(杭州)检测其蛋白质含量22.0%,油酸含量77.9%,亚油酸含量4.74%,油亚比16.43。该品种中抗叶斑病、青枯病和锈病,于2023年通过国家非主要农作物品种登记,是目前浙江省育成的首个高油酸食用型花生新品种。浙花6号高产稳产、早熟性好、耐连作,综合性状优良,适宜在长江中下游生态区浙江地区春播及夏播种植。

Additive neurorestorative effects of exercise and docosahexaenoic acid intake in a mouse model of Parkinson’s disease

There is a need to develop interventions to slow or reverse the degeneration of dopamine neurons in Parkinson’s disease after diagnosis.Given that preclinical and clinical studies suggest benefits of dietary n-3 polyunsaturated fatty acids,such as docosahexaenoic acid,and exercise in Parkinson’s disease,we investigated whether both could synergistically interact to induce recovery of the dopaminergic pathway.First,mice received a unilateral stereotactic injection of 6-hydroxydopamine into the striatum to establish an animal model of nigrostriatal denervation.Four weeks after lesion,animals were fed a docosahexaenoic acid-enriched or a control diet for the next 8 weeks.During this period,the animals had access to a running wheel,which they could use or not.Docosahexaenoic acid treatment,voluntary exercise,or the combination of both had no effect on(i)distance traveled in the open field test,(ii)the percentage of contraversive rotations in the apomorphine-induction test or(iii)the number of tyrosine-hydroxylase-positive cells in the substantia nigra pars compacta.However,the docosahexaenoic acid diet increased the number of tyrosine-hydroxylase-positive terminals and induced a rise in dopamine concentrations in the lesioned striatum.Compared to docosahexaenoic acid treatment or exercise alone,the combination of docosahexaenoic acid and exercise(i)improved forelimb balance in the stepping test,(ii)decreased the striatal DOPAC/dopamine ratio and(iii)led to increased dopamine transporter levels in the lesioned striatum.The present results suggest that the combination of exercise and docosahexaenoic acid may act synergistically in the striatum of mice with a unilateral lesion of the dopaminergic system and provide support for clinical trials combining nutrition and physical exercise in the treatment of Parkinson’s disease.

6-苄基氨基嘌呤结合柠檬酸复合处理对水晶葡萄采后品质的影响

为探究柠檬酸、6-苄基氨基嘌呤(6-benzylaminopurine,6-BA)及复合处理对水晶葡萄采后品质的影响,分别使用30 mg/L 6-BA、1%柠檬酸及两者复合液对水晶葡萄进行浸泡处理后贮藏于(1±0.3)℃,85%~90%相对湿度保鲜库内40 d,每10 d对各项指标进行测定。结果表明,复合处理能有效抑制水晶葡萄腐烂率、褐变率及脱落率的增加,减缓硬度、多酚、维生素C及可溶性固形物含量的下降和多酚氧化酶(polyphenol oxidase,PPO)活性的升高,保持可溶性蛋白质和游离氨基酸含量接近采摘当天时的含量,使水晶葡萄采后保持良好的感官和营养品质。贮藏第40天时,复合处理组果实腐烂率、褐变率及PPO活性分别比对照组低51.01%、48.94%、36.80%,而果实硬度、维生素C含量、多酚含量分别是对照组的1.42倍、2.05倍、2.91倍,显著延缓了水晶葡萄软化和褐变。因此,6-BA和柠檬酸复合处理更有利于维持水晶葡萄贮藏期间的综合品质。

6-氟-4-羟基-3-氧代-3,4-二氢喹喔啉-1(2 H)-羧酸叔丁酯的合成、晶体结构及抗肿瘤活性研究

喹喔啉类化合物由于具有显著的生物活性而被广泛应用于医药、化工领域,特别是抗癌药物研发领域。本文通过四步反应法首次合成了6-氟-4-羟基-3-氧代-3,4-二氢喹喔啉-1(2 H)-羧酸叔丁酯,经溶液结晶法获得其单晶体。晶体学分析表明,该化合物属单斜晶系,空间群C2/c,晶胞常数a=1.28663(10)nm,b=2.25249(17)nm,c=1.01564(7)nm,Z=8,ρ_(c)=1.359 g·cm^(-3),R=0.0538,R_(w)=0.1406。在B3LYP/6-311+G(2d,p)模式下使用密度泛函理论(DFT)计算了该化合物的最佳结构,与X射线单晶衍射确定的晶体结构基本一致。抗肿瘤活性研究表明其有良好的抗肿瘤作用。此外,通过DFT计算了分子的静电势和前沿分子轨道。

产妇产褥感染病原菌特点及白细胞介素-6、肿瘤坏死因子-α、α1酸性糖蛋白联合检测对感染程度的预测价值

目的 分析产妇产褥感染病原菌的特点及白细胞介素-6(IL-6)、肿瘤坏死因子-α(TNF-α)、α1酸性糖蛋白(α1-AG)联合检测对感染程度的预测价值。方法 选取2022年12月至2023年11月山东省泰安市妇幼保健院收治的62例产褥感染产妇为研究组,纳入同期65例无产褥感染产妇为对照组。采用全自动微生物鉴定仪检测病原菌,酶联免疫吸附法检测组间IL-6、TNF-α、α1-AG水平,影响因素行logistic回归分析,绘制受试者工作特征(ROC)曲线分析IL-6、TNF-α、α1-AG对不同产褥感染患者感染程度的预测价值。结果 62例产褥感染患者以宫内感染最为常见,占比41.94%,阴道感染(30.65%)占比第二;62例产褥感染患者共检出74株病原菌,其中革兰氏阴性菌占比63.51%,革兰氏阳性菌占比31.08%;革兰氏阴性菌中以大肠埃希菌、铜绿假单胞菌最为常见,分别占比39.19%、17.57%,革兰氏阳性菌中金黄色葡萄球菌最为常见,占比17.57%。研究组IL-6、TNF-α、α1-AG水平均高于对照组(P<0.05);研究组产褥期重度感染患者IL-6、TNF-α、α1-AG水平高于轻度感染组与中度感染组(P<0.05)。IL-6、TNF-α、α1-AG高水平表达为产褥感染不同感染程度的独立危险因素(P<0.05)。ROC曲线结果显示,IL-6、TNF-α、α1-AG三项联合检测的灵敏度为96.77%,特异度为96.92%,均高于单一指标检测结果;三项联合检测的曲线下面积为0.901(95%CI=0.813~0.950)。结论 产褥感染主要发生于宫内感染,病原菌以革兰氏阴性菌为主,IL-6、TNF-α、α1-AG联合检测在产褥不同感染程度患者中的预测价值较高。

铜改性抗菌防螨聚酰胺6纤维的制备及其性能

为解决纳米铜抗菌剂在纤维中分散性、界面相容性差的问题,采用油酸对纳米球形铜抗菌剂进行包覆处理,并与聚酰胺6(PA6)基体共混挤出造粒制得抗菌防螨PA6切片,再经熔融单组分纺丝和熔融复合纺丝制得铜改性抗菌防螨PA6纤维。对铜抗菌剂的形貌结构和界面相容性,抗菌防螨PA6切片的热稳定性和可纺性以及纤维的铜含量、力学性能和抗菌防霉防螨性能进行分析。结果表明:油酸包覆球形铜抗菌剂的分散性较好,且与PA6基体相容性良好,抗菌防螨PA6切片的热稳定性、可纺性良好;铜改性抗菌防螨PA6纤维的颜色均匀性一致,纤维制成率高达88%,铜改性PA6拉伸变形丝的断裂伸长率为29.95%,断裂强度达到4.43 cN/dtex;洗涤50次前后铜改性抗菌防螨PA6纤维对白色念珠菌、金黄色葡萄球菌、大肠杆菌的抑菌率均大于99%,其织物防霉等级达到0级,螨虫驱避率达到89%,抗菌防霉防螨性能高效耐久。