Total phenolic content
Phenolic compounds are commonly found
in plants and have been reported to have
several biological activities including antioxidant
properties. It may be a useful
indicator of potential nutritional benefit. The
total phenolic content in the extracts was
determined according to the colorimetric
Folin–Ciocalteu method with gallic acid as
a standard compound (R2
= 0.97, y = 13.89x)
(data not shown). A wide range of total
phenolic content was found in the plant
materials studied as shown in Figure. 1.
Their contents ranged from 1.83 ± 0.02 to
19.21 ± 0.29 mg gallic acid equivalent (GAE)/
100g of dried samples, with an average of
9.64 mg(GAE)/100g fresh sample.
Among the six samples, the tamarind
seed extracted at 60°C/6 hours demonstrated
the highest phenolic content (19.21 ± 0.29
mg(GAE)/100g fresh sample), followed by
tamarind seed extracted at 100°C/15
minutes (18.91 ± 0.36 mg(GAE)/100g fresh
sample), tamarind seed extracted at 40°C/
12 hours (13.72 ± 0.30 mg(GAE)/100g fresh
sample), tamarind pulp extracted at 60°C/6
hours (2.14 ± 0.05 mg(GAE)/100g fresh
sample), tamarind pulp extracted at 100°C/
15 minutes (2.02 ± 0.10 mg(GAE)/100g fresh
sample) and tamarind pulp extracted at
40°C/12 hours (1.83 ± 0.02 mg(GAE)/100g
fresh sample). One-way ANOVA showed
significant differences (p