3. Results
3.1. Comparison of polyphenol contents between green and black
tea decoctions
We compared the phenol contents of 15-min decoction of green
tea versus black tea (Table 2). The sum of phenolic compounds was
3 times more important in GTD versus BTD (p < 0.0001vs BTD).
However, the caffeine content was higher in BTD than in GTD
(p < 0.001vs GTD). In addition, some of phenolic compounds were
different. Both decoctions display free catechins and EGCG
although GTD presenting 28-time more EGCG than BTD (p < 2.107
vs BTD). More interestingly, in black tea decoction the most predominant
peaks were gallic acid esters, gentissic acid esters, theaflavins
and thearubigins that are poorly detectable at GTD.
Conversely, GTD displayed EGC, ECG and gallic acids that are not
detected in BTD. This difference urges us to compare their respective
effect as chronic consumption in HFD fed rats.