Estimation of the market value of Central African tea by theaflavin analysis
- 1 February 1972
- journal article
- research article
- Published by Wiley in Journal of the Science of Food and Agriculture
- Vol. 23 (2) , 227-232
- https://doi.org/10.1002/jsfa.2740230210
Abstract
The price of plain and medium quality teas sold on the London auction on two separate occasions was closely correlated to their theaflavin content. An equation including theaflavin content and the colour of the tea liquor was derived, and explained 60% of the variation in market price at any one time. A very close agreement was found between theaflavin content and a broker's valuation. It is suggested that the results justify the use of theaflavin analysis as an objective assessment of tea quality in research.Keywords
This publication has 11 references indexed in Scilit:
- Biological and chemical factors affecting the valuations of north-east indian plains teas: II.—Statistical evaluation of the biochemical constituents and their effects on briskness, quality and cash valuations of black teasJournal of the Science of Food and Agriculture, 1971
- Biological and chemical factors affecting the valuations of north-east indian plains teas: I.—Statistical association of liquor characteristics with cash valuations of black teasJournal of the Science of Food and Agriculture, 1971
- The separation of theaflavins on Sephadex LH-20Journal of Chromatography A, 1971
- Isotheaflavin. A new black tea pigmentTetrahedron Letters, 1970
- The constitution and configuration of the theaflavin pigments of black teaTetrahedron Letters, 1970
- The structures of the theaflavins of black teaTetrahedron Letters, 1970
- Nonvolatile components of black tea and their contribution to the character of the beverageJournal of Agricultural and Food Chemistry, 1969
- The chemical basis of quality in tea. III.—correlations of analytical results with tea tasters' reports and valuationsJournal of the Science of Food and Agriculture, 1964
- The phenolic substances of manufactured tea. IX.—the spectrophotometric evaluation of tea liquorsJournal of the Science of Food and Agriculture, 1963
- Spectrophotometric measurements of theaflavins and thearubigins in black tea liquors in assessments of quality in teasThe Analyst, 1961