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- W2389212443 abstract "[Objective] The study aimed to establish the method of measuring the gallic acid content in tea by ionized extraction separation and spectrophotometry.[Method] With the Ya′an Zang tea as the sample,the water extract from tea samples was prepared by using water extract method.First,the NaHCO3 was added into the water extract from tea samples to make the ionization treatment,then through the extraction and separation by using ethyl acetate the disturbance factor of gallic acid and catechin were separated out,at last,the content of gallic acid in the water layer of extraction raffinate phase was measured by using spectrophotometer.[Result] The content of gallic acid in the tea sample was(1.32±0.18)% and the relative deviation was 1.36%.The measured value accorded to the reported value in literature and the values of 5 parallel determinations was close each other.The recovery of standard addition in this measured method was 99.4%-103.2%,the RSD value for 3 repeations were lowed than 2.5%.[Conclusion] Compared with other experimental method,the method has obvious advantages such as simple operation,low cost and low requirement of instrument and had higher precision and accuracy in detecting the gallic acid content in tea sample." @default.
- W2389212443 created "2016-06-24" @default.
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- W2389212443 date "2009-01-01" @default.
- W2389212443 modified "2023-09-23" @default.
- W2389212443 title "Determination on the Gallic Acid Content in Tea by Ionized Extraction Separation and Spectrophotometry" @default.
- W2389212443 hasPublicationYear "2009" @default.
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