HPLC法同时测定白英叶中绿原酸、咖啡酸及芦丁的含量

目的:建立HPLC法同时测定白英叶中绿原酸、咖啡酸及芦丁含量的方法。方法:采用HPLC法,Angilent ZorbaxODS C₁₈色谱柱（250 mm×4.6 mm,5μm）,柱前加保护柱;流动相为乙腈-1%冰醋酸溶液,梯度洗脱;流速:0.6 ml·min^-1;柱温:25℃;检测波长327 nm。结果:绿原酸质量浓度在2.16～43.20μg.·ml^-1（r=0.999 5）内与峰面积呈良好的线性关系,平均回收率为99.05%,RSD=1.29%;咖啡酸质量浓度在2.15～43.04μg·ml^-1（r=0.999 8）内与峰面积呈良好的线性关系,平均回收率为100.04%,RSD=1.65%;芦丁质量浓度在5.24～104.74μg·ml^-1内与峰面积呈良好的线性关系,平均回收率99.60%,RSD=1.74%。结论:该方法准确、重复性良好,能同时测定白英叶中的3种有效成分,可用于白英药材及饮片的质量控制。     

RP-HPLC法测定蒲公英中绿原酸与咖啡酸的含量

目的测定蒲公英中绿原酸与咖啡酸的含量。方法采用Diamonsil C18色谱柱,流动相为乙腈-磷酸二氢钠缓冲液(13∶87,v/v),检测波长323 nm。结果绿原酸在2.4~48.0μg/mL(r=0.999 5),咖啡酸在1.0~20.0μg/mL(r=0.999 7)线性关系良好,咖啡酸、绿原酸的平均回收率分别为99.7%(RSD=0.8%)和100.8%(RSD=1.1%)。结论该方法准确、可靠、重现性好,可作为控制蒲公英药材质量的方法。     

Alpha-lipoic acid attenuates insulin resistance and improves glucose metabolism in high fat diet-fed mice

Aim:

To investigate whether alpha-lipoic acid (ALA) could attenuate the insulin resistance and metabolic disorders in high fat diet-fed mice.

Methods:

Male mice were fed a high fat diet (HFD) plus ALA (100 and 200 mg·kg⁻¹·d⁻¹) or HFD plus a positive control drug metformin (300 mg·kg⁻¹·d⁻¹) for 24 weeks. During the treatments, the relevant physiological and metabolic parameters of the mice were measured. After the mice were euthanized, blood samples and livers were collected. The expression of proteins and genes related to glucose metabolism in livers were analyzed by immunoblotting and real time-PCR.

Results:

HFD induced non-alcoholic fatty liver disease (NAFLD) and abnormal physiological and metabolic parameters in the mice, which were dose-dependently attenuated by ALA. ALA also significantly reduced HFD-induced hyperglycemia and insulin resistance in HFD-fed mice. Furthermore, ALA significantly upregulated the glycolytic enzymes GCK, HK-1 and PK, and the glycogen synthesis enzyme GS, and downregulated the gluconeogenic enzymes PEPCK and G6Pase, thus decreased glucose production, and promoted glycogen synthesis and glucose utilization in livers. Moreover, ALA markedly increased PKB/Akt and GSK3β phosphorylation, and nuclear carbohydrate response element binding protein (ChREBP) expression in livers. Metformin produced similar effects as ALA in HFD-fed mice.

Conclusion:

ALA is able to sustain glucose homeostasis and prevent the development of NAFLD in HFD-fed mice.     

Effects of high molecular weight water-soluble chitosan on in vitro fertilization and ovulation in mice fed a high-fat diet

A high molecular weight water-soluble chitosan (WSC) with an average molecular weight of 300 kD and a deacethylation level of over 90% was produced using a simple multi-step membrane separation process. It is known that WSC prevents obesity induced by a high-fat diet. Consequently, this study investigated whether or not WSC improved the ovarian dysfunction caused by obesity in mice. The mice were fed a high density protein and lipid diet for 4 weeks, followed by the administration of WSC at 480 mg/kg body weight per day for 4 days. Thereafter, the changes in body weight, ovulation rate, in vivo and in vitro fertilization and embryonic development were measured. WSC markedly reduced the body weight of obese mice fed with a high-fat diet, but not in mice fed with a normal diet. WSC had significant effects on the ovulation rate, both the in vivo and in vitro fertilization rates and embryonic development. These results indicate an improvement in the ovarian and oviduct dysfunction caused by obesity, and suggest an adjustment in the internal secretions and metabolic functions.     

HPLC法测定金银花药材含量

为了更加精确地测定金银花药材含量,本文采用HPLC法测定金银花药材的含量。色谱柱为86—200—D_5—C_(18)(十八烷基硅烷键合硅胶);流动相为甲醇—水—冰乙酸(20:80:1);检测波长:324nm,本法重现性好,方法易于掌握,结果稳定。     

HPLC法同时测定金银花中4种主要成分的含量

目的:通过HPLC法测定金银花中四种主要成分绿原酸、当药苷、咖啡酸、木犀草苷的含量。方法:色谱柱为Inert-sil ODS-3 C₁₈色谱柱（250 mm×4.6 mm,5μm）。梯度洗脱法,流动相A为0.05%磷酸;B为乙腈,流速为1.0 ml·min^-1,检测波长为234 nm。结果:绿原酸、咖啡酸在0.01～0.20 mg·ml^-1浓度范围内均呈良好线性关系,r=0.999 8;同时当药苷、木犀草苷在0.001～0.020 mg·ml^-1浓度范围内均呈良好线性关系,r=0.999 8。平均加样回收率均在96%～101%,精密度和重复性的RSD均<3%,24 h内稳定性良好。结论:本分析方法简单、灵敏、准确、重复性好,可同时分析金银花中四种主要成分。     

HPLC法同时测定消炎片中绿原酸、秦皮乙素和咖啡酸的含量

目的:建立HPLC法同时测定消炎片中绿原酸、秦皮乙素和咖啡酸的含量.方法:采用Agilent Eclipse XDB-C18 (250mm×4.6 mm,5μm)色谱柱,以甲醇-乙腈-0.04％磷酸溶液为流动相,梯度洗脱;检测波长为328 nm;流速1.0ml·min -1;进样量20μl;柱温35℃.结果:绿原酸、秦皮乙素和咖啡酸的线性范围分别为1.616 ～40.400μg·ml-1(r=0.999 9,n=7)、5.164～129.100μg ·ml-1(r=1.000 0,n=7)和1.344～ 26.880 μg·ml-1(r=1.000 0,n=7);提取回收率分别为99.08％(RSD=0.6％,n=6)、98.81％(RSD =0.4％,n=6)和98.92％(RSD=0.9％,n=6).结论:本法操作简便、快速、结果准确.     

肠道菌群调控肥胖症脂质代谢机制的研究进展

肥胖是全球性健康问题,与多种代谢疾病相关。肠道菌群的特定改变是肥胖和肥胖相关的代谢疾病的重要特征之一。近年来,肠道菌群在肥胖及相关代谢疾病中的作用受到了越来越多的关注,被认为是肥胖潜在的治疗靶点。肠道菌群的组成丰富,其参与宿主脂质代谢机制复杂。本文介绍了肥胖发生发展过程中的代表性菌种,概述了肠道微生物调控宿主脂质代谢的潜在机制的研究进展,以期为基于肠道菌群为靶点的治疗手段和药物研发提供思路。     

Chlorogenic acid loaded chitosan nanoparticles with sustained release property,retained antioxidant activity and enhanced bioavailability

In this study, chlorogenic acid (CGA), a phenolic compound widely distributed in fruits and vegetables, was encapsulated into chitosan nanoparticles by ionic gelation method. The particles exhibited the size and zeta potential of 210 nm and 33 mV respectively. A regular, spherical shaped distribution of nanoparticles was observed through scanning electron microscopy (SEM) and the success of entrapment was confirmed by FTIR analysis. The encapsulation efficiency of CGA was at about 59% with the loading efficiency of 5.2%. In vitro ABTS assay indicated that the radical scavenging activity of CAG was retained in the nanostructure and further, the release kinetics study revealed the burst release of 69% CGA from nanoparticles at the end of 100th hours. Pharmacokinetic analysis in rats showed a lower level of C_max, longer T_max, longer MRT, larger AUC_0–t and AUC_0–∞ for the CGA nanoparticles compared to free CGA. Collectively, these results suggest that the synthesised nanoparticle with sustained release property can therefore ease the fortification of food-matrices targeted for health benefits through effective delivery of CGA in body.     

熊果酸改善高脂血症小鼠肥胖症的实验研究

目的探讨熊果酸对高脂饮食致C57BL/6J小鼠肥胖症的改善作用。方法将45只4周龄小鼠C57BL/6J随机分为对照组、模型组和药物组。药物组每天灌喂熊果酸10 mg.kg-1.d-1,对照组和模型组均灌喂等剂量的安慰剂(0.1%吐温80)。每4周小鼠称重。20周后检测不同处理组小鼠的血糖、胰岛素和瘦素的水平。结果药物组与模型组相比,小鼠体重显著增加,血清中瘦素、血糖、胰岛素水平也存在显著性差异。模型组与对照组小鼠体重无显著性差异,血清中瘦素、血糖和胰岛素水平也无显著性差异。结论熊果酸可明显抑制高脂饮食小鼠的体重增加,降低血清中瘦素、血糖和胰岛素水平。     

HPLC同时测定宜宾产蒲公英中的咖啡酸和绿原酸

目的 采用HPLC法同时测定宜宾产蒲公英中咖啡酸和绿原酸的含量.方法 色谱柱为Waters symmetry shield~(TM) C_(18)柱(250 mm×4.6 mm,5 μm),流动相为乙腈-0.1%磷酸(10:90),检测波长328 nm,流速1.0 mL·min~(-1).结果 咖啡酸、绿原酸的线性范围分别为0.08～0.80 μg(r=0.9992)、0.04～0.40 μg(r=0.9994);平均回收率分别为101.4%(RSD=2.9%)、100.0%(RSD=3.2%).结论 绿原酸的含量为0.011%～0.052%,咖啡酸的含量为0.035%～0.069%,咖啡酸的含量远高于2005年版<中国药典>规定的0.02%的限度.所用方法准确、可靠,可用于蒲公英的质量控制.     

HPLC法测定银黄颗粒中黄芩苷、黄芩素、绿原酸和咖啡酸的含量

摘 要 目的: 建立HPLC法测定银黄颗粒中黄芩苷、黄芩素、绿原酸和咖啡酸的含量。方法: 色谱柱为ZOBRAX Extend C₁₈（250 mm×4.6 mm,5 μm）,流动相为乙腈 1%冰醋酸溶液,梯度洗脱;流速1.0 ml·min^-1,柱温30℃,检测波长327 nm。结果:4个成分在各自浓度范围内线性关系良好（r≥0.999 5）,加样回收率为97.3%～99.1%。 结论:该法操作简便快捷,准确可靠,重复性好,可用于测定银黄颗粒中黄芩苷、黄芩素、绿原酸和咖啡酸的含量。     

HPLC法测定银花抗感片中绿原酸的含量

目的采用高效液相色谱法测定银花抗感片中绿原酸的含量。方法色谱柱C18,以乙腈-0.4%磷酸溶液(10∶90)为流动相;检测波长为327nm。结果绿原酸的进样量在0.04～0.8μg范围内与峰面积呈良好的线性关系(r=0.9996),平均加样回收率为98.1%,RSD为1.15%。结论该方法简便易行,结果可靠,可有效地控制银花抗感片的质量。     

氢杨梅素改善高脂饮食诱导的肥胖小鼠肝脏脂肪沉积及机制（英文）

有文献报道, SIRT1-AMPK信号通路可能在DHM改善肝脏细胞甘油三酯蓄积、胰岛素抵抗等作用中发挥作用。为此,本课题拟进一步观察DHM对高脂饮食诱导的肥胖小鼠肝脏脂肪沉积的影响,并探讨其可能机制。C57BL/6J小鼠采用普通饲料和高脂饲料喂养,同时分别用或不用低剂量(125 mg/kg)或高剂量(250 mg/kg)的DHM处理16周。实验期间,每两周检测体重一次。16周后,眼眶静脉取血并处死动物,同时取肩胛下、附睾与腹股沟的脂肪并用电子秤进行称重,并记录脂肪重量。全自动生化分析仪检测:血清甘油三酯(triglyceride,TG)、血清总胆固醇(totalcholesterol,TC)、血清高密度脂蛋白(high-densitylipoprotein,HDL)、血清低密度脂蛋白(low-densitylipoprotein,LDL)。取肝脏甲醛固定、HE和油红O染色检测肝脏脂肪沉积情况;比色法检测肝脏MDA和SOD含量; Realtime PCR检测相关指标的基因表达:IL-6、IL-8、TNF-α、乙酰辅酶A羧化酶(acetyl-Co A carboxylase, ACC)、固...     

银黄口服液中黄芩苷和绿原酸含量的测定

目的　建立高效液相色谱法测定银黄口服液中黄芩苷、绿原酸的含量。方法　Nova -pakC18(2 5 0mm× 4 6mm ,10 μm)色谱柱 ,黄芩苷流动相为甲醇 - 0 4 %磷酸 (5 0∶5 0 ) ,流速为 1 0ml·min-1,检测波长为 2 78nm ;绿原酸流动相为乙腈 -0 4 %磷酸 (13∶87) ,流速为 1 0ml·min-1,检测波长为 318nm。结果　黄芩苷在 0 2 4 5 3～ 1 4 718μg范围内呈良好的线性关系 ,平均回收率为 99 6 8% ,RSD为 0 87% ,重现性RSD为 0 5 6 % ;绿原酸在 0 2 30 1～ 1 6 10 7μg范围内呈良好的线性关系 ,平均回收率为 99 5 8% ,RSD为 1 10 % ,重现性RSD为 0 4 6 %。结论　本法简便、快速、灵敏、准确、重现性好 ,可作为银黄口服液的质量控制标准     

基于PPARs信号通路探索CB1对脂质代谢的调节作用

目的 研究CB1对PPARs信号通路在高脂饮食诱导肥胖小鼠脂质代谢的调节作用.方法 构建小鼠肥胖模型,观察给予CB1抑制剂利莫那班后小鼠体重、肝脏重量及血清生化指标的变化,并检测CB1、PPARα、PPAR β和PPARγ基因在各组织mRNA水平的表达情况.结果 利莫那班降低了小鼠的体重和肝脏重量(P＜ 0.05);改善了血清生化指标(P＜0.05);各组织中CB1基因mRNA水平的表达降低(P＜ 0.05);PPARα、PPARγ基因在皮下脂肪、内脏脂肪、肝脏组织mRNA水平的表达显著增高(P＜ 0.05);PPAR 3基因在各组织mRNA水平表达情况差异无统计学意义.结论 CB1通过作用于PPARα、PPARγ调节脂质代谢,为临床上脂质代谢紊乱的治疗提供了另一个可靠的理论依据.     

HPLC同时测定银黄含化片中绿原酸和黄芩苷含量

目的　建立HPLC法测定银黄含化片中绿原酸和黄芩苷含量的方法。方法　采用ODS色普柱(25 0mm×4 . 6mm,5 μm),以乙腈- 1%磷酸溶液为流动相进行梯度洗脱,检测波长为316nm。结果　绿原酸、黄芩苷分别在0 . 0 2mg·ml-1～0 . 19mg·ml-1和0 . 1mg·ml-1～0 . 8mg·ml-1浓度范围内呈良好线性关系,平均回收率分别为97. 3%和98. 6 %。结论　方法准确、灵敏,回收率高,可用于该制剂的质量控制     

Fatty acid composition in serum correlates with that in the liver and non-alcoholic fatty liver disease activity scores in mice fed a high-fat diet

In this study, we investigated the correlation between the serum fatty acid composition and hepatic steatosis, inflammation, hepatocellular ballooning scores, and liver fatty acids composition in mice fed a high-fat diet. Livers were collected for non-alcoholic fatty liver disease score analysis. Fatty acid compositions were analysed by gas chromatography. Correlations were determined by Pearson correlation coefficient. Exposed to a high-fat diet, mice developed fatty liver disease with varying severity without fibrosis. The serum fatty acid variation became more severe with prolonged exposure to a high-fat diet. This variation also correlated significantly with the variation in livers, with the types of fatty acids corresponding to liver steatosis, inflammation, and hepatocellular ballooning scores. Results of this study lead to the following hypothesis: the extent of serum fatty acid variation may be a preliminary biomarker of fatty liver disease caused by high-fat intake.     

高效液相色谱法测定痔炎消胶囊中绿原酸的含量

目的建立高效液相色谱法测定痔炎消胶囊中绿原酸的含量.方法采用shim-pack C18柱(250 mm×4.6 mm,5μm),流动相为乙腈-0.4%磷酸(1090),测定波长327nm.结果绿原酸线性范围为0.08～1.28μg,r=0.9999.平均回收率为98.5%,RSD=1.4%(n=5).结论操作简便,结果准确.可用于测定痔消炎胶囊中绿原酸的含量.