Effect of Wood Extractives on the Equilibrium Moisture Content of Six Sudanese Hardwood Species

Zeinab A. A. Ahmed, Abdelazim Yassin Abdelgadir, Ashraf Mohameed Ahmed Abdalla

Abstract


The objective of this investigation was to study the effect of
extractive content on the wood sorption isotherms of six Sudanese hardwood species i.e. Acacia nilotica, A.senegal, Anogeissus leiocarpus, Boswellia papyrifera, Ailanthus excelsa and Calotropis procera growing in North and South Kordofan States. For each species, wood samples were collected from six trees, from which specimens were prepared. The effect of extractives on equilibrium moisture content was studied by comparing the equilibrium moisture content of hot water extracted and unextracted wood. Experimental equilibrium moisture content values for extracted and unextracted specimens were obtained at different levels of relative humidity. These specimens were placed in a closed desiccator, which contained saturated salt solution or different concentrations of sulphuric acid to maintain relative humidity and then kept in an oven at the specified temperature (60 ○C) until equilibrium moisture content was obtained. Desorption and adsorption isotherms of the six wood species exhibited sigmoid curves. The results showed direct relationship between equilibrium moisture content and relative humidity that could be well explained by third-order polynomial functions. The effect of extraction was significant at few relative humidity values in some species;
unextracted wood had higher equilibrium moisture content than extracted
wood.

Keywords


Sorption isotherms; equilibrium moisture content; desorption and adsorption isotherms; extraction

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References


ASTM. American Society of Testing and Materials. (1981). Annual Book of

ASTM Standards, Vol. 04 -02.c39 – 83b.

Chang, S.T, Wang, J-H, Wu, C.L, Chen, P.F, & Kuo, Y.H. (2000).

Comparison of the antifungal activity of cadinane skeletal

sesquiterpenoid from Taiwania (Tawania CrypromerioidesHayara)

heartwood. Holzforschung 54(3), 241-245

Carter, F.L, Garlo, A.M, & Stanely, J.B. (1978). Termiticidal components of

wood extracts: 7-methyl-juglone from Diospyros virginiana. Journal of

Agricultural andFood Chemistry 26, 869-873.

Choong, E.T.and S.S. Achmadi. (1991). Effect of extractives on moisture

sorption and shrinkage in tropical woods. Wood and Fiber 23(2), 185-196.

Hawley, L.F, Fleck, L.C, & Richards, C.A. (1924). The relation between

durability and chemical composition in wood. Industrial & Engineering

Chemistry 16(7), 699-700

Hinterstoisser, B.; Stefke, B.; Schwanninger, M. (2000). Wood: Raw

material- material-Source of Energy for the future. Lignovisionen 2, 29-

Hillis, W.E. (1968). Chemical aspects of heartwood formation. Wood Science

and

Technology 2(3),241-259.

Ladomersky, J. (1979). Influence of extractives on the equilibrium moisture

content of wood. Drevarsky vyskum, 23(3): 145-154(only English

abstract).

Litvay, J.D. and M.D. Mckimmy. (1975). Determination moisture content

and moisture sorption in Douglas- Fir Bark. Wood Science 7(4), 284-

Koch, P. (1985). Utilization of Hardwoods Growing on Southern Pine Sites.

Vol 1. Raw material. U. S. Department of Agriculture, Forest Service.

Mahgoub, A.A. (2001). Variation in wood density and shrinkage of twelve

species from KordofanState. M.Sc. Thesis University of Khartoum.

Mcdaniel, C. A. (1992). Major antitermitic components of the heartwood of

Southern Catalpa. Journal of Chemical Ecology 18(3), 359-369.

Mohammed, M.A. (1999). The effect of wood extractives of some sudanese

treespecies on Portland cement setting. M.Sc. Thesis University of

Khartoum.

Morimoto, M.; Fukumoto, H.; Hiratani, M.; Chavasir, W. & Komai, K.

(2006). Insect Antifeedants, Pterocarpans and Pterocarpol in

Heartwood of Pterocarpus macrocarpus Kruz. Biosci. Biotechnol.

Biochem. 70, 1864-1868.

Neter, J.; Wassemrman, W. and Kutner , M.H. (1983). Applied Linear

Regression Model. IRWIN, Homewood, Illinois.

Ohmura, W, Doi, S, Aoyama, M, & Ohara, S. (2000). Antifeedant activity of

flavonoids and related compounds against the subterranean termite

Coptotermes formosanus Shiraki. Journal of Wood Science. 46, 149-

.

Oliveira, L.S.; Santana, A.L.B.D.; Maranhão, C.A.;Miranda, R.C.M.; Galvão

de Lima, V.L.A.; Silva, S.I.; Nascimento, M.S. & Bieber, L. (2010).

Natural resistance of five woods to Phanerochaete chrysosporium

degradation. International Biodeterioration & Biodegradation 64,

-715.

Petersen, R.G. (1985). Design and Analysis of Experiments. Marcel Dekker

Inc. New York. 429 pp.

Reyes-chilpa, R, Gomez-Garibay, F, Moreno-Torres, G, Jimenez-Estrada, M,

& Quiroz Vaásquez, R. I. (1998). Flavonoids and isoflavonoids with

antifungal properties fromPlatymiscium yucatanum heartwood.

Holzforschung 52(5), 459-462.

Santana, A.L.B.D.; Maranhão, C.A.; Santos, J.C.; Cunha, F.M.;

Conceição,G.M.;

Bieber, L.W. & Nascimento, M.S. (2010). Antitermitic activity of extractives

from three Brazilian hardwoods against Nasutitermes corniger.

International Biodeterioration & Biodegradation 64, 7-12

Schultz, T.P.; Nicholas, D.D. (2002). Development of Environmentallybenign Wood Preservatives based on the Combination of Organic

Biocides with Antioxidants and Metal chelators. Phytochemistry 61:

-560

Schultz, T. P, & Nicholas, D. D. (2002). Naturally durable heartwood:

evidence for aproposed dual defensive function of the extractives.

Phytochemistry 54, 47-52.

Scheffer, T.C, & Morrell, J.J. (1998). Natural Durability of Wood: a

Worldwide Checklist of Species. Oregon State University College of

Forestry, Forest Research Laboratory Research Contribution 22.

Skaar, C. (1972). Water In Wood, Syracuse University Press.

Spalt, H.A. (1958). The fundamentals of water vapor by wood. Forest

Product Journal 8, 228- 295.

Taylor, A.M.; Gartner, B.L.; Morrell, J.J. (2006). Effects of Heartwood

Extractive fractions of Thuja plicata and Chamaecyparis

nootkatensison wood degradation by termites or Fungi. Journal of

Wood Science 52, 147-153.

Walker, J.C.F. (1993). Primary Wood Processing. Principles and

Practice.1st Edition. Chapman and Hall 285pp

Wang, S.Y. and C.L Cho. (1993). Equilibrium moisture contents of six wood

species and their influence. Wood Research Society 39(2), 126- 137.

Wangaard, F.F and L.A.Granados (1967). The effect of extractive on

watervapor sorption by wood. Wood Science and Technology, 1(4),

- 277.


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