Total phenolic and lignin contents, phytochemical screening, antioxidant and fungal inhibition properties of the heartwood extractives of ten Congo Basin tree species

Table 3 Lignin content, extractives contents, and their corresponding total phenolic content (TPC) and antioxidant activity (AA) of the different studied wood species

	Bahia	Bilinga	Doussie	Moabi	Movingui	Okan	Okoume	Ozigo	Padouk	Tali
^aToluene/ethanol extract (%)	2.2 ± 0.5	5.8 ± 1.0	10.8 ± 1.0	7.8 ± 0.2	8.7 ± 0.1	11.4 ± 2.0	2.8 ± 0.5	2.1 ± 0.3	7.8 ± 0.3	8.5 ± 0.4
^bTPC	119	164	935	54	490	829	122	146	273	581
^cAA	20	22	175	48	54	133	23	23	32	118
^aEthanol extract (%)	0.4 ± 0.1	1.6 ± 0.1	2.0 ± 0.5	2.2 ± 0.2	3.0 ± 0.3	4.1 ± 1.2	0.5 ± 0.2	1.1 ± 0.4	2.0 ± 0.1	3.8 ± 2.0
^bTPC	268	239	582	51	359	559	105	298	172	450
^cAA	18	20	140	32	36	114	26	27	31	96
^aTotal extractive content (%)	2.7 ± 0.6	7.7 ± 1.2	13.5 ± 1.3	10.0 ± 0.4	11.7 ± 0.5	16.0 ± 2.0	3.5 ± 0.7	3.3 ± 0.7	9.8 ± 0.4	12.3 ± 2.0
^dLignin content (%)	26.5 ± 1.5	31.2 ± 1.0	32.2 ± 1.6	29.3 ± 1.2	25.7 ± 1.6	34.4 ± 1.3	28.4 ± 1.0	28.3 ± 1.3	28,9 ± 1.2	35.9 ± 0.9

Average values and SD were obtained on four replicates
^aThe amount of extractives was calculated as a percentage of the initial anhydrous mass of sawdust
^bTPC values are in mg eq. gallic acid/g of extract; SD are inferior to 0.01 for all values
^cAA values are in micromoles AAE/μg of extract; SD are inferior to 0.001 for all values
^dPercent of lignin content for each sawdust wood species using standard method

ISSN: 1297-966X