Acetylation of tropical hardwood species from forest plantations in Costa Rica: an FTIR spectroscopic analysis

Table 1 Uptake and weight percentage gain of wood from nine tropical woods treated with acetic anhydride at three different acetylation times

Wood species	Acetylation time (h)	Uptake (l/m³)	Weight percentage gain
Vochysia ferruginea	1.0	591.1 (58.2)^Aa	16.8 (0.7)^bA
	2.5	538.8 (56.3)^A	16.3 (1.5)^A
	4.0	574.4 (63.8)^A	16.4 (1.5)^A
Vochysia guatemalensis	1.0	562.2 (80.4)^A	17.4 (1.6)^A
	2.5	547.1 (62.0)^A	17.3 (1.8)^A
	4.0	535.6 (32.2)^A	15.4 (1.6)^A
Enterolobium cyclocarpum	1.0	564.3 (89.6)^B	11.9 (2.4)^AB
	2.5	587.3 (47.0)^B	13.5 (2.4)^B
	4.0	479.1 (53.7)^A	9.7 (0.9)^A
Cordia alliodora	1.0	448.3 (94.0)^A	10.9 (1.4)^A
	2.5	289.6 (22.5)^A	8.3 (0.7)^A
	4.0	309.8 (17.0)^A	7.8 (0.7)^A
Samanea saman	1.0	356.9 (19.2)^A	4.5 (0.3)^A
	2.5	441.7 (12.0)^C	8.5 (0.4)^C
	4.0	282.8 (16.8)^B	6.8 (0.3)^B
Hyeronima alchorneoides	1.0	457.3 (41.0)^B	6.6 (0.4)^B
	2.5	340.6 (43.3)^A	5.2 (0.3)^A
	4.0	286.3 (79.0)^A	4.8 (0.2)^A
Gmelina arborea	1.0	98.8 (12.1)^A	2.2 (0.7)^A
	2.5	127.4 (12.6)^A	2.6 (1.0)^A
	4.0	117.3 (64.9)^A	2.7 (1.6)^A
Cedrela odorata	1.0	159.2 (36.3)^A	5.1 (1.3)^A
	2.5	159.6 (32.6)^A	4.9 (0.9)^A
	4.0	140.3 (27.0)^A	4.5 (1.0)^A
Tectona grandis	1.0	156.7 (13.1)^A	2.6 (0.4)^A
	2.5	149.5 (20.4)^A	2.5 (0.4)^A
	4.0	160.4 (20.1)^A	2.6 (0.2)^A

^a Different letters between acetylation times for a given parameter indicate statistical differences at 99%
^b Values in the parentheses represent the standard deviations (SD)