Table 1. Total phenolic content (in dry matter) and antioxidant activity index of palm kernel cake, palm pressed fibre, palm kernel shell and empty fruit bunch extracts from two extraction cycles at a liquid-to-solid ratio of 30:1 and 20 min extraction time.

Oil palm waste stream	w(total phenolics as GAE)/(mg/g)	Antioxidant activity index
Palm kernel cake	(5.19±0.02)a	1.24±0.02
Palm pressed fibre	(3.59±0.26)b	0.91±0.09
Palm kernel shells	(3.66±0.07)b	1.48±0.29
Empty fruit bunches	(1.79±0.05)c	0.18±0.03

Data are presented as mean value±standard deviation of three independent replicates (p<0.01, 95%). Values with different letter in superscript are significantly different (p<0.05 and p<0.01). GAE=gallic acid equivalent