Chromatographic fingerprint analysis of Fructus Aurantii Immaturus by HPLC-DAD and chemometric methods

An efficient method for quality control of Fructus Aurantii Immaturus (FAI), a famous traditional Chinese medicine (TCM) was established. A simple and reliable high-performance liquid chromatography-photodiode array detector (HPLC-DAD) procedure coupled with chemometric methods was developed for fingerprint analysis, qualitative analysis and quantitative determination of this herb. In qualitative and quantitative analyses, heuristic evolving latent projection (HELP) method was employed to resolve the overlapping peaks of the tested samples. Two bioactive components, namely hesperidin and naringin, are confirmed and determined, together with four flavonoids compounds tentatively identified including two new ones. From fingerprint analysis, the fingerprint data were processed with correlation coefficients for quantitative expression of their similarity and dissimilarity. The developed method based on an integration of chromatographic fingerprint and quantitative analysis is scientific, and the obtained results can be applied to the quality control of herb medicine.     

不同冲泡次数普洱生茶浸出物含量及滋味品质变化分析

采用超高效液相色谱-高分辨质谱联用技术结合茶叶感官审评方法，分析普洱生茶不同冲泡次数茶汤中浸出物的变化和滋味特征。从普洱生茶茶汤中共检出138 种浸出物，主要为氨基酸类、儿茶素及其衍生物、酚酸及其衍生物、黄酮类、生物碱类5 类物质，其对茶汤的主要滋味贡献为鲜味与苦涩味。普洱生茶茶汤的滋味总体评分与苦度、涩度、厚度呈显著正相关，不同冲泡次数下的浸出物总量与滋味总体评分呈显著正相关。浸出物总量及滋味品质均在第2泡时达到最大，后随冲泡次数的增加，浸出物总量不断减少，茶汤滋味逐渐淡薄。本研究围绕普洱生茶冲泡过程中浸出物的变化及其与滋味品质的关系进行分析，有助于揭示云南普洱生茶的耐泡性以及冲泡过程中茶汤滋味的变化特点。     

14种凉味剂的热解动力学分析研究

采用非等温热重法和两种动力学拟合方法（KAS法和Coats-Redfern法）对14种凉味剂进行了热解动力学分析。结果表明:（1）采用KAS拟合法估算的14种凉味剂的活化能变化范围为48.08 ~86.26 kJ/mol,且活化能随着转化率的增大而增大;（2）采用Coats-Redfern法求解了14种凉味剂的热解动力学参数（活化能和指前因子）,其中异薄荷酮、薄荷素油、异胡薄荷醇、椒样薄荷油的活化能为15.51 ~43.37 kJ/mol,DL-薄荷醇、WS-23、L-薄荷酮、乙酸薄荷酯、乳酸薄荷酯、WS-3、薄荷酮甘油缩酮、琥珀酸单薄荷酯活化能为47.69 ~76.18 kJ/mol,WS-5、WS-12活化能为85.52 ~92.36 kJ/mol。      

茯砖茶优势菌株分离鉴定及发酵低级绿茶分析

对湖南白沙溪茯砖茶中的优势菌株进行分离、纯化,并通过形态学分析和ITS序列比对进行鉴定.以云南大叶种低级绿茶为原料进行纯菌发酵,分析发酵液主要成分含量的变化.结果表明:从湖南白沙溪茯砖茶中分离得到的4株优势菌株,其中J1被鉴定为谢瓦曲霉(Aspergillus chevalieri);J2、J3和J4均被鉴定为冠突曲霉...     

樟芝菌液态发酵多糖富硒条件优化及其抗炎活性研究

为提高樟芝菌液态发酵硒多糖产量，探究樟芝菌多糖富硒后活性方面的变化。以生物量、多糖含量、硒含量和富硒率为评价指标，利用单因素试验和正交试验对发酵条件进行优化，综合得出最佳发酵条件。同时在脂多糖(lipopolysaccharide, LPS)诱导小鼠腹腔巨噬细胞(RAW264.7)建立炎症模型的基础上，评价樟芝菌硒多糖与无硒多糖的抗炎活性。通过发酵优化得到最佳发酵条件为Na₂SeO₃添加量2 mg/L、麦芽糖24 g/L、可溶性淀粉16 g/L、玉米浆干粉9 g/L,硫酸铵9 g/L,装液量75 mL/250 mL、初始pH值7,24℃、150 r/min发酵9 d。体外细胞实验结果表明，二者均能够显著降低促炎介质NO、TNF-α、IL-6和IL-1β的释放量，提高细胞内超氧化物歧化酶(superoxide dismutase, SOD)活性，起到有效抑制炎症反应的作用。而且，硒多糖在提高SOD活性、抑制IL-1β释放方面效果要优于无硒多糖。综上，樟芝菌硒多糖在富硒的同时，能够具有高于无硒多糖的抗炎活性，具备一定的开发前景。