共查询到20条相似文献,搜索用时 78 毫秒
1.
2.
3.
老鹰茶虫茶的生产及其利用初探 总被引:2,自引:0,他引:2
老鹰茶虫茶是一种特种茶饮料。介绍了老鹰茶虫茶的生产工艺流程及其工艺要点,根据老鹰花虫花的品质特征,对其开发利用途径作了初步探讨。 相似文献
4.
<正> 我国茶税、榷茶(国家专卖)和茶法均始于唐。 唐德宗建中元年(780)(《辞海·茶税》)或建中三年(《旧唐书·德宗本纪》)或建中四年(《旧唐书·食货志下》),户部侍郎赵赞提出茶叶收税,税额为10%。这种茶税到德宗兴元元年(784年)下诏停止。到了德宗贞元九年(793年),盐铁使张滂提出收条税,皇帝又下诏恢复。到了穆宗(821~824)登基,遇到藩镇叛乱,国库空虚,而皇帝还要在宫中大兴土木,造“百尺楼”,于是盐铁使王播提出把茶税增加到50%,并亲往江淮、浙东西 相似文献
5.
6.
7.
对不同的培养条件下茶愈伤组织生长及其茶氨酸累积情况进行了研究。结果表明,激素IAA和6-BA结合作用时,存在着相互效应,其中以IAA2mg/L和6-BA4mg/L时对茶氨酸累积最有利。不同碳源对于愈伤组织生长和茶氨酸积累的影响相近。增加糖浓度有利于次生代谢物的累积,茶氨酸组织的最适培养温度和茶氨酸累积温度都是25℃。暗培养比有光培养更有利于茶氨酸的累积。茶氨酸的累积曲线与愈伤组织生长密切相关,调节培养基成分使茶氨酸在茶愈伤组织(干质量)中的含量达到了201.6mg/g. 相似文献
8.
9.
10.
11.
我一直固执地认为,爱喝茶的人要么外表斯文温文尔雅、要么举止文雅仙风道骨。在见到一品古道范承胜先生时,我的"固执"得以应验,这次见吴秘书长,我很庆幸,我的"固执"又一次"巧合"地吻上了,看来我应该继续"固执"下去……吴锡端,中国茶叶流通协会秘书长,他有着典型的茶人脸庞,一看就是位知者、智者;他是嗅着茶香长大的,与茶的缘分是天定的。要说他的茶缘,且随我一同进入本期的茶奇人物吧! 相似文献
12.
Jin Ze Xu Lai Kwok Leung Yu Huang Zhen‐Yu Chen 《Journal of the science of food and agriculture》2003,83(15):1617-1621
The present study was carried out to quantify green tea epicatechin (GTE) derivatives and to investigate the origin of epicatechin epimers present in 18 selected canned or bottled tea drinks. The major GTEs present in tea are (?)‐epigallocatechin gallate (EGCG), (?)‐epigallocatechin (EGC), (?)‐epicatechin gallate (ECG) and (?)‐epicatechin (EC). HPLC analysis showed that the content of total GTEs was lower (16.4–268.3 mg l?1) in the canned and bottled tea drinks than in tea traditionally prepared as a beverage in a cup or teapot (3–5 g l?1). The major finding was that they contained higher levels of epicatechin epimers, namely (?)‐gallocatechin gallate (GCG), (?)‐gallocatechin (GC), catechin gallate (CG) and (?)‐catechin (C), than of GTEs, ranging from 7.6 to 331.8 mg l?1. To investigate the origin of these epimers, GTEs were extracted from longjing green tea and autoclaved at various temperatures for 10–60 min. It was found that at least 50% of GTEs were epimerised to their corresponding epimers when autoclaved at 120 °C for 20 min. It is concluded that epicatechin epimers in tea drinks are not originally present in green tea leaf but are instead derived from thermal conversion of GTEs. Copyright © 2003 Society of Chemical Industry 相似文献
13.
14.
15.
The polyphenol compositions of green tea (GT) and black tea (BT) are very different due to post-harvest processing. GT contains higher concentrations of monomeric polyphenols, which affect numerous intracellular signaling pathways involved in prostate cancer (CaP) development. BT polymers, on the other hand, are poorly absorbed and are converted to phenolic acids by the colonic microflora. Therefore, after consumption of GT, higher concentrations of polyphenols are found in the circulation, whereas after BT consumption the phenolic acid levels in the circulation are higher. The majority of in vitro cell culture, in vivo animal, and clinical intervention studies examine the effects of extracts of GT or purified (-)-epigallocatechin-3-gallate (EGCG) on prostate carcinogenesis. These studies provide strong evidence supporting a chemopreventive effect of GT, but results from epidemiological studies of GT consumption are mixed. While the evidence for a chemopreventive effect of BT is much weaker than the body of evidence with regard to GT, there are several animal BT intervention studies demonstrating inhibition of CaP growth. This article will review in detail the available epidemiological and human clinical studies, as well as animal and basic mechanistic studies on GT and BT supporting a chemopreventive role in CaP. 相似文献
16.
刘智钧 《食品安全质量检测学报》2020,11(1):8-12
中国既是茶的原产地,也是茶的生产与消费大国,每年由于茶饮料及茶叶深加工产生大量的茶渣,仅仅以简单地丢弃处理而没有被高值化综合利用,既给环境带来了巨大的压力也造成了资源的浪费。茶渣中含有10%至16%粗纤维以及少量的络合态色素、矿物质、氨基酸、茶多酚、咖啡碱等,可以被多种形式地精深加工利用。本文综述了茶渣作为主要配料在作菌类的培养基、动物饲料的添加剂、植物的土壤肥料等方面的应用,以期为茶与茶渣的研究与利用提供参考。 相似文献
17.
《食品工业科技》2015,(5)
以自制黑茶为研究对象,分别采用超临界CO2萃取法、醇水浸提法及醇水浸提-超临界CO2联合萃取法对茶样中的茶多酚进行提取,用正交实验法优化了提取条件,以没食子酸为标准品,在765nm处用紫外可见分光光度法检测产品中茶多酚的含量,计算了茶多酚的得率及萃取样中产品的纯度,并对三种产品的DPPH·清除率进行了比较。结果表明:3种方法中醇水-超临界CO2联合萃取法的得率和纯度最高。联合浸提最优条件为:先用乙醇浓度80%,料液比1∶10g/m L,60℃下浸提2.0h,然后25MPa,50℃下超临界CO2萃取时间2h。茶多酚的得率为6.36%±0.81%,产品纯度为:41.22%±3.19%。产品对DPPH·的清除率为90.64%±0.0187%。该方法绿色环保,未添加任何有害溶剂,为黑茶饮品的进一步研究开发提供参考。 相似文献
18.
目的建立一种普洱茶中茶多糖的提取工艺。方法以普洱茶为材料,采用水提醇沉法,研究了浸提温度、浸提时间、浸提次数、乙醇浓度4个因素对普洱茶中茶多糖提取率的影响,并通过正交实验确定茶多糖的最佳提取工艺。且用此提取工艺测定市售不同级别普洱茶中茶多糖含量。结果普洱茶中茶多糖的最佳提取工艺为:浸提温度90℃,浸提时间40 min,浸提次数3次,乙醇浓度80%。该提取工艺重复性好,吸光度与葡萄糖含量呈良好的线性关系(n=5),线性范围0.02~0.10 mg/L(r2=0.9999)。实验也发现,普洱茶的嫩度越低,茶多糖的含量越高。结论本方法简便、快捷、重复性好,可作为茶叶多糖原材料和产品质量控制的方法。 相似文献
19.