Natural Chemistry COMPARISON OF TANNIN AND CAFFEINE CONTENT BETWEEN ROOIBOS AND BLACK TEA Beverage Caffeine Tannin Reference Rooibos Nil 4.4 Blommaert & Steenkamp, 1978   6.0 RIFF, 1983 Black Tea 3.87 - 3.94   Ouwour et al., 1988 3.23 - 3.67   Ouwour et al., 1988 2.86 - 3.93   Ouwour et al., 1988   7.18 - 15.0 Mitchell, 1936   13.0 Hooper, 1925 « back   next »