Production of Monomeric Aromatic Compounds from Oil Palm Empty Fruit Bunch Fiber Lignin by Chemical and Enzymatic Methods

. 2015 Dec 22;2015:891539. doi: 10.1155/2015/891539

(a) pH

Compounds	pH 7		pH 8		pH 10		pH 12
Compounds	Yield	Recovery	Yield	Recovery	Yield	Recovery	Yield	Recovery
Hydroxybenzoic acid	153.14 ± 3.07^A	7.66 ± 0.15^a	165.30 ± 2.51^B	8.27 ± 0.13^b	162.72 ± 4.13^B	8.14 ± 0.21^b	156.14 ± 4.03^A	7.81 ± 0.20^ab
Syringaldehyde	13.89 ± 0.22^B	0.70 ± 0.01^b	14.94 ± 0.36^C	0.75 ± 0.02^b	13.93 ± 0.90^B	0.70 ± 0.05^b	2.71 ± 0.60^A	0.14 ± 0.03^a
Vanillin	3.33 ± 0.58^A	0.17 ± 0.03^a	8.02 ± 0.32^B	0.40 ± 0.02^b	8.49 ± 0.09^B	0.42 ± 0.01^b	9.55 ± 0.53^C	0.48 ± 0.03^b
p-Coumaric acid	7.04 ± 0.21^A	0.35 ± 0.01^a	7.72 ± 0.20^B	0.39 ± 0.01^ab	8.22 ± 1.18^B	0.41 ± 0.06^b	6.83 ± 0.45^A	0.34 ± 0.02^a
Ferulic acid	13.80 ± 0.63^B	0.69 ± 0.03^b	14.06 ± 0.13^B	0.70 ± 0.07^b	13.68 ± 0.38^B	0.68 ± 0.02^b	7.78 ± 0.39^A	0.39 ± 0.02^a

Note.

^A-BDifferent alphabets in the same row indicated that there are significant differences (p < 0.05) between the yields from different pH.

^a-bDifferent alphabets in the same row indicated that there are significant differences (p < 0.05) between the recoveries from different pH.