To explore the effect of low deuterium water content on the extraction rate of caffeine and tea polyphe-nols in tea,taking Nanyue Yunwu tea and summer and autumn black tea as an example,low deuterium water bio-technology and boiling water bath extraction experiments,microstructure testing and characterization analysis were carried out.The results show that:(1)The infrared spectra of four types of deuterium containing water almost over-lap,with obvious characteristic peaks in the wavelength range of 1500-3400 cm-1;(2)Compared to the distilled water group,the low deuterium water group showed an increase in the color of the tea soup of Nanyue Yunwu tea,summer and autumn black tea.Compared to the distilled water group,the tea surface of the 50 mg·kg-1low deuteri-um water group showed obvious cracks and collapses,while there was no significant difference in the other groups.Compared with the distilled water group,the extraction rate of caffeine in the low deuterated water group at four dif-ferent collection points was higher;(3)Compared to the initial soaking time,the leaching rates of caffeine in all four groups were improved,and the leaching rates of caffeine in different low deuterated water groups were higher at 5 s,10 s and 15 s.Different levels of low deuterium water are beneficial for the dissolution of caffeine and tea polyphe-nols in Nanyue Yunwu tea,summer and autumn black tea.
关键词
低氘水/咖啡碱/茶多酚/南岳云雾茶夏秋红茶
Key words
low deuterium water/coffee base/tea polyphenols/Nanyue Yunwu tea summer and autumn black tea
维普
万方数据