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

(e) Temperature

Compounds	40°C		55°C		65°C
Compounds	Yield	Recovery	Yield	Recovery	Yield	Recovery
Hydroxybenzoic acid	492.54 ± 38.89^A	6.16 ± 0.49^a	557.80 ± 12.76^B	6.97 ± 0.16^b	498.88 ± 42.35^A	6.24 ± 0.53^a
Syringaldehyde	35.22 ± 2.01^A	0.44 ± 0.03^a	53.94 ± 1.20^B	0.67 ± 0.02^b	60.12 ± 4.26^C	0.75 ± 0.05^c
Vanillin	15.99 ± 0.74^A	0.20 ± 0.01^a	21.68 ± 0.50^B	0.27 ± 0.01^b	23.44 ± 2.21^B	0.29 ± 0.03^b
p-Coumaric acid	13.94 ± 1.29^A	0.17 ± 0.02^a	22.81 ± 1.44^B	0.29 ± 0.02^b	13.01 ± 2.15^A	0.16 ± 0.03^a
Ferulic acid	37.81 ± 2.35^B	0.47 ± 0.03^a	46.94 ± 1.59^C	0.59 ± 0.02^b	31.74 ± 2.80^A	0.40 ± 0.04^a

Note.

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

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

Yield of oxidation products was expressed in unit part per million (ppm), while recovery of oxidation products from lignin was expressed in unit milligram per gram of lignin (mg g⁻¹ lignin).