𝔖 Bobbio Scriptorium
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Isotheaflavin. A new black tea pigment

✍ Scribed by D.T. Coxon; A. Holmes; W.D. Ollis

Publisher
Elsevier Science
Year
1970
Tongue
French
Weight
312 KB
Volume
11
Category
Article
ISSN
0040-4039

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✦ Synopsis

The green leaf used in the manufacture of black tea contains a number of flavanols @.flavanol gallates including (-)-epigallocatechin gallate (9-13%), (-)-epicatechin gallate (3-6%%), (-)-epfgallocatechin (3-64yJ, (-)-epicatechin (l-3%), and other flavanols (l-2B.l These precursors are transformed into the theaflavin 2-5 and thearubigin6 type pigments of black tea during the fermentation step, which involves an enzyme-catalysed oxidative coupling process.

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Three new theaflavins from black tea
Three new theaflavins from black tea
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Pive theaflavin pigments of blaak tea have so far been reported; theaflavin,la3 isotheaflavin, 2 theaflavin-3-and 3'4nonogallates 293 snd theaflavin digallate.2'3

The constitution and configuration of th
The constitution and configuration of the theaflavin pigments of black tea
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The pigments characteristic of black tea infusions are of two general types' associated with the theaflavin fraction and the thearubigin fraction. The thearubigins have been recognised as polymeric proanthocyanidins . 2 The theaflavin fraction contains a considerable number of compounds which are