Effect of different levels of fortification of wheat flour with defatted coconut flour on the quality of fibre-enriched biscuits
Defatted coconut flour obtained from the whitish kernel residue left after the extraction of virgin coconut oil has potential application in high protein-fiber enriched food products. A study was conducted to investigate the use of defatted coconut flour in the preparation of fiber-enriched biscuits. In this, wheat flour was fortified with defatted coconut flour in varying proportions (w/w, 0, 10, 20, 30, 40, 50, 60, and 70%) to prepare a series of blends for biscuit dough. Biscuits samples prepared according to a standard recipe were evaluated by a 36-member semi-trained panel using a 7-point hedonic scale to determine the critical limit of defatted coconut flour substitution in wheat flour for acceptable quality biscuits. Results showed that defatted coconut flour could be used to substitute wheat flour up to a level of 40% without affecting the overall quality. At this level, the dietary fiber content of the biscuit was found to increase by about 10 times. Although biscuit samples showed good acceptability at the beginning, their keeping quality decreased with the increasing level of defatted coconut flour in the biscuit formulation.
AOCS 1987. Official and Tentative Methods of the American Oil Chemists' Society. 3rd edn., Champaign, IL: American Oil Chemists’ Society.
Arancon, R.N. 1999. Coconut flour, Cocoinfo International 6: 8–10.
Awasthi, P. and Yadav, M.C. 2000. Effect of incorporation of liquid dairy by-products on chemical characteristics of soy-fortified biscuits, J. Food Sci. Technol., 37: 158–161.
Baensch, W., Yalegama, C. and Jayasundera, J. M. M. A. 2004. New technologies of coconut processing- part I: Process for production of virgin coconut oil and low fat / high protein coconut flour from coconut kernel, pp. 261–269, In Proceeding II of the International Coconut Conference-2004, T.S.G. Peiris and C.S. Ranasinghe, (Eds.) Coconut Research Institute of Sri Lanka, Lunuwila.
Bemiller, J.N and Low, N.H. 1998. Carbohydrate Analysis, pp.172–173. In: Food Analysis - Part II , S. S. Nielson (Ed.), Aspen Publishers, Gathersburg, Maryland.
Banzon, J.A., and Valesco, J.R. 1982. Coconut flour, pp. 227–238, In: Coconut - Production and Utilization, Philippines Coconut Research and Development Foundation Inc., Philippines.
BIS 1974. Specification for Protein-rich biscuits, IS 7487. Indian Standards Institution, New Delhi.
Chavan, J.K. and Kadam, S.S. 1999. Nutritional enrichment of bakery products by supplementation with non-wheat foods. Crit. Rev. Fd Sci. Nut. 33: 189–226.
de Man, J. M. 1990. Carbohydrates, pp. 143–182. In: Principles of Food Chemistry, 2nd edn., Van Nostrand Reinhold, New York.
Leelavathi, K. and Rao, P.H. 1993. Development of high fiber biscuits using wheat bran, J. Food Sci. Technol. 30: 187–190.
Marikkar, J.M.N., Jayasundera, J.M.M.A., Fernando, S.R. and Peiris. T.S.G. 2006. Fortification of coconut oil with sesame oil through micro expeller extraction process. Cord 22: 15–22.
Mbofung, C.M.F., Silou, T., and Mouragadja, I. 2002. Chemical characterization of safou (Dacryodes edulis) and evaluation of its potential as an ingredient in nutritious biscuits, Forest, Trees and Livelihood, 12: 105–117.
Ong, A.S.H., Choo, Y.M., and Ooi, C.K. 1995. Developments in palm oil, pp. 153–191. In: Developments in Oils and Fats, R. J. Hamilton (Ed.), Blackie Academic & Professional, Glasgow.
Pearson, D., 1973. pp.48–57. Laboratory techniques in food analysis, The Butterworth Group, London, U.K.
PORIM Test Method, 1995, pp. 72–100. Palm Oil Research Institute of Malaysia, Ministry of Primary Industries, Malaysia.
Ramaswamy, L. 2006. Preparation of coconut flour - its keeping quality and acceptability in recipes, Indian Cocon. J. 36(9): 13–16.
SAS Statistical Analysis System User’s Guide: Basic Statistics 1998. SAS Institute Inc. Cary, NC.
Shapton, D.A. and Shapton, N.F. 1998. Microbiological criteria data tables, In: Principles and Practices for the Safe Processing of Foods, pp. 388-441. Woodhead Publishing Limited, Cambridge.
SLS 251:1991, Specification for biscuits, Sri Lanka Standard Institution, Colombo.
SLS 256:1991, Microbiological Test Methods, Sri Lanka Standard Institution, Colombo.
Swe, P.Z., Che Man, Y.B., and Ghazali, H.M. 1995. Composition of crystals of palm olein formed at room temperature, J. Am. Oil Chem. Soc. 72: 343–347.
Trinidad, T. P., Valdez, D. H., Loyola, A. S., Mallillin, A. C., Askali, F. C., Castillo, J. C., Masa, D. B. 2003. Glycaemic index of different coconut (Cocos nucifera) – flour products in normal and diabetic subjects, Brit. J. of Nutri. 90: 551–557.
USDA 2005, National Nutritional Data Base for Standard Reference, United States Department of Agriculture, Washington D.C.
Yalegama, L.L.W.C., and Chavan, J.K. 2006. Studies on utilization of coconut flour as a source of cell wall polysaccharides, Trop. Agric. Res. 18: 126-134.