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Table 1 Total phenolics, flavonoids, tannins and antioxidant activity of the green, black and yellow tea leaves

From: Phenol content and antioxidant activity of green, yellow and black tea leaves

Samples TPC (g/kg) TFC (g/kg) TC (g/kg) DPPH (μmol/100 g) ABTS (μmol/100 g)
Methanol      
 YT      
  Pulverised 4.116 ± 0.113a 3.776 ± 0.004a 1.045 ± 0.003a 18.825 ± 0.094a 29.345 ± 0.124a
  Intact 2.433 ± 0.213b 1.679 ± 0.037b 0.658 ± 0.004b 16.846 ± 0.046b 23.007 ± 0.283b
 GT      
  Pulverised 2.262 ± 0.113b 1.557 ± 0.026b 0.691 ± 0.001c 16.040 ± 0.503c 20.738 ± 0.171c
  Intact 1.109 ± 0.149c 0.671 ± 0.041c 0.375 ± 0.002d 13.109 ± 0.125d 16.067 ± 0.286d
 BT      
  Pulverised 1.139 ± 0.064c 0.326 ± 0.017d 0.263 ± 0.003e 12.241 ± 0.346e 16.356 ± 0.314d
  Intact 0.575 ± 0.049d 0.220 ± 0.022e 0.168 ± 0.003f 11.930 ± 0.434f 13.064 ± 0.132e
Methanol + HCl      
 YT      
  Pulverised 6.629 ± 0.121e X 1.948 ± 0.001g 26.521 ± 0.081g 40.733 ± 0.314f
  Intact 5.108 ± 0.135f X 1.556 ± 0.002h 21.427 ± 0.262h 32.237 ± 0.251g
 GT      
  Pulverised 3.823 ± 0.142g X 1.168 ± 0.003i 20.382 ± 0.046i 32.815 ± 0.472g
  Intact 3.662 ± 0.199g X 1.066 ± 0.004a 19.159 ± 0.162j 27.055 ± 0.289h
 BT      
  Pulverised 4.226 ± 0.270h X 1.256 ± 0.001j 18.002 ± 0.062k 27.032 ± 0.032h
  Intact 3.733 ± 0.242i X 0.941 ± 0.002k 17.513 ± 0.088l 26.120 ± 0.075i
  1. Total phenolics (TPC), flavonoids (TFC), tannins (TC) and antioxidant activity (DPPH and ABTS) of the green (GT), black (BT) and yellow (YT) tea leaves.
  2. Values in the same column with different superscripts (a to k) are significantly different (P < 0.05) by analysis of variance (ANOVA) and Fisher's least significant difference (LSD).