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- Ultrasonic extraction was used to extract the gypenosides from fresh leaves sample(F), fixed sample(X),baked sample(B), air-dried sample(A) and dry tea sample(D) of Gynostemma pentaphyllum. 用超声法提取绞股蓝鲜叶样、杀青样、烘干样、风干样以及绞股蓝袋泡茶干茶样的总皂甙,并测定其含量。
- Abstract: Ultrasonic extraction was used to extract the gypenosides from fresh leaves sample(F), fixed sample(X),baked sample(B), air-dried sample(A) and dry tea sample(D) of Gynostemma pentaphyllum. 摘 要:用超声法提取绞股蓝鲜叶样、杀青样、烘干样、风干样以及绞股蓝袋泡茶干茶样的总皂甙, 并测定其含量。
- They summed up a lot of essential points of tea sampling from their personal experience. 他们从切身的感受与深刻的体验中,总结出品茶的诸多要素。
- METHODS After ultrasonic extraction in 50% acetonitrile (v/v) at room temperature, tea samples were analyzed by HPLC-DAD/MS/MS. 方法茶样经50%25乙腈(v/v)室温超声提取后进行HPLC-DAD/MS/MS分析。
- Conclusion:This method is accurate, stable, reproducible and suitable for the determination of catechins and CAF in tea samples. 结论:该方法准确、稳定,重复性好,可用于茶叶中七组分的定量分析。
- VDE method showed a little effect on tea samples,compared with other two methods,and could better reflect the characteristic of green tea aroma. VDE法对茶样的影响较小,能较好地反映茶叶的香气特征。
- The color of GABA tea samples in spring was brighter than those in summer and the GABA tea samples in summer was dark red and yellow. 至于茶汤水色,则是春季产制者较明亮,夏季者则较暗且颜色呈现深红且偏暗黄。
- Analytical results showed that the superstandard rate of Cu was more lower than that of Pb, heavy metal contamination of tea samples during processing and packaging... 结果显示,样品中铜的超标率远远低于铅的超标率,样品在生产、包装过程中重金属污染较为严重,其中常规茶样品在生产加工、包装过程中的污染情况较有机茶更为严重。
- Among the volatile chemical components identified by GC/MS, acetic acid, anisole, cetane, caffeine, hexadecanoic acid and bisphenol A were found in all tea samples. 在鉴定出的化学成分中,乙酸、大茴香醚、十六烷、咖啡因、十六酸和双酚A是5种茶叶样品中所共有的化学成分,每种茶叶样品中又都含有一些特有的化学成分。
- Let the tea leaves steep in boiling water for five minutes. 让茶叶在滚开的水中浸泡五分钟。
- Each of us partook of a cake and a cup of tea. 我们每人吃了一个饼和一杯茶。
- What I need is nothing but a sample. 我需要的不过是一件样品而已。
- I'd like to place an order for some tea with you. 我想从贵公司订购一些茶叶。
- A nice cup of tea will soothe your nerves. 一杯好茶可以使你的心绪平静下来。
- Do you take milk and sugar in your tea? 你的茶里要加牛奶和糖吗?
- Must you dash off? Why not stay for a cup of tea? 你一定要急急忙忙走吗?为何不留下喝杯茶呢?
- We have tea at four o'clock in the afternoon. 我们在下午四点钟喝茶。
- The nurse took a sample of my blood for tests. 护士抽了我的血样去化验。
- She offer me tea in her best cup and saucer. 她用她最好的茶杯和茶碟请我用茶。
- Airmail revised price list but full range sample within fortnight. 航空寄上订正价格表,全套样品两周内寄出。