Distribution of Phenolic Compounds and Antioxidative Activities of Rice Kernel and Their Relationships with Agronomic Practice

Table 2

Phytochemicals of rice cultivars (mean values of 2 years) as affected by treatments (conventional or organic) in different seasons.

Properties	Seasons
	S1	S2	S3	S4
Total phenolic content; (mg GAE/100 g fw)	161.5^bc	158.1^c	171.7^a	168.9^ab
Reducing power; (abs. reading)	0.028^a	0.021^c	0.029^a	0.025^b
DPPH (%)	26.9^b	30.2^b	45.6^a	43.0^a
Flavonoid; (mg QAE/g fw)	15.3^b	18.7^ab	21.7^a	19.7^ab
Ferrous chelating (%)	40.1^b	39.7^b	38.4^b	46.1^a

Values for each parameter followed by a different letter within each row are significantly different, ≤ 0.05 (Duncan’s Multiple Range Test). Abs. = absorbance; GAE = Gallic Acid Equivalent; QAE = Quercetin Acid Equivalent.