基于TRNSYS的茯砖茶生产工艺能源系统节能环保特性研究

茯砖茶发酵、干燥过程中，烘房内温湿度稳定性和能源系统低能耗是保证茯砖茶品质与成本的重要因素。本文采用TRNSYS仿真与实验研究相结合的方法，对咸阳某茯砖茶厂实际使用的空气源热泵系统进行建模，通过研究各季节典型代表月烘房温湿度的波动情况，确定该空气源热泵系统在全年的运行状态是否满足工艺要求，在此基础上，对比了该系统在全年可运行季节代表月与该生产厂房早期使用的燃气锅炉系统的能耗仿真结果，对空气源热泵系统的节能与环保特性进行研究。结果表明：由于夏季送风质量流量过大且室外空气含湿量较高，7月烘房温湿度不满足工艺要求。热泵系统在1、4、10月的总标煤消耗量的平均值是锅炉系统的44.42%，平均CO2、SO2、NOx排放量分别为锅炉系统的34.13%、44.1%、40.60%。在茯砖茶发酵、干燥的过程中，相比于燃气锅炉系统，空气源热泵系统具有更好的节能与环保特性。     

孔子与普洱茶

中国是茶的故乡，中国有自己的文化圣人，在茶与圣人孔子之间，有没有一条文化的纽带，骆承烈教授的这篇文章给了我们一个很好的启示。     

悬浮液进样-火焰原子吸收光谱法测定茶叶中的微量铬

将茶叶悬浮于琼脂胶体中制成悬浮液 ,直接喷入空气 -乙炔火焰 ,用火焰原子吸收光谱法测定茶叶中的微量铬 ,方法简便、快速、灵敏度和精密度高、测定结果与用灰化法处理样品一致 ,检验表明 ,两种样品前处理方法之间无显著性差异。相对标准偏差为 3.4 %～ 6 .1% ,加标回收率为 95 .7%～ 10 3.8 %。     

用微波萃取法提取茶叶中茶多酚的工艺研究

以乙酸乙酯作为溶剂对茶叶进行微波萃取,通过比较不同萃取工艺的优缺点,对提取出的茶多酚采用标准曲线法进行测定,结果表明,用此法对茶多酚的萃取率较高,且省时,效率高。通过进一步的放大性实验,可以验证此方法在工业化提取茶多酚的应用方面很有前景。     

Non-targeted analysis of tea by hydrophilic interaction liquid chromatography and high resolution mass spectrometry

Tea is the second most consumed beverage in the world and its consumption has been associated with numerous potential health benefits. Factors such as fermentation methods, geographical origin and season can affect the primary and secondary metabolite composition of tea. In this study, a hydrophilic interaction liquid chromatography (HILIC) method coupled to high resolution mass spectrometry in both positive and negative ionisation modes was developed and optimised. The method when combined with principal component analysis to analyse three different types of tea, successfully distinguished samples into different categories, and provided evidence of the metabolites which differed between them. The accurate mass and high resolution attributes of the mass spectrometric data were utilised and relative quantification data were extracted post-data acquisition on 18 amino acids, showing significant differences in amino acid concentrations between tea types and countries. This study highlights the potential of HILIC chromatography combined with non-targeted mass spectrometric methods to provide a comprehensive understanding of polar metabolites in plant extracts.     

脂溶性儿茶素类化合物的制备研究进展

儿茶素类化合物是一类具有多种生理活性的多酚类抗氧化剂,本文综述了国内外利用分子修饰法制备脂溶性儿茶素类化合物的进展。化学法主要利用酰氯在化学催化剂作用下反应制备脂溶性儿茶素,但是酰化反应发生的位点有所不同,总的来说酰基供体碳链长度一般大于等于8;酶法主要利用脂肪酶使脂肪酸或脂肪酸酯通过直接酯化或酯交换反应制备脂溶性儿茶素,在儿茶素及其化合物上键合烷基,由此提高了儿茶素类化合物在油脂体系中的溶解度,拓展了其应用领域。     

茶多酚制品中有机溶剂多残留检测方法研究进展

现有的茶多酚分离制备工艺大多采用有机溶剂或大孔树脂,给产品带来了有机溶剂残留的安全隐患。本文概述了茶多酚的生产工艺及其残留溶剂的检测方法,主要介绍了直接进样气相色谱法、顶空气相色谱法和固相微萃取气相色谱法这三种方法在残留溶剂测定中的应用进展;提出有必要研究有机溶剂多残留快速检测技术,制定限量标准,提升加工工艺。     

Effect of electrolyzed reduced water on chiral theanine and polyphenols in tea

Pure d/l-theanine enantiomers were synthesized separately, and SEM was used for their crystal-structure observation. The novel enantiomeric separating method by HPLC was established using the chiral selector of β-CD in the mobile phase. Green tea, white tea, oolong tea, black tea and Pu-erh tea were tested for theanine enantiomers by different degrees of fermentation. The significantly higher d-enantiomeric proportion of theanine was found in white tea than the others, which was probably due to its specific processing step of withering. The effect of electrolyzed reduced water (ERW) on enantiomeric theanine and polyphenols in tea was explored. There was no change of theanine, but rather a loss of ECG (epicatechin gallate) and an increasing amount of GA (gallic acid). ERW also reduced tea cream, which contains significant amount of polyphenols, indicating its potential application in the tea-beverage industry.     

茶叶之路沿途晋商会馆设立及作用与分布特征

根据茶叶之路的线路及特征，通过对茶叶之路沿途所建的晋商会馆的介绍，探讨了茶叶之路沿途晋商会馆的设立及作用，并总结了晋商会馆的分布特征，对茶叶之路的发展起到了推动作用。