Abstract
The amino acid composition of seeds of twenty-six species were determined by column chromatography. Total nitrogen was initially determined by the Kjeldahl procedure. Chemical scores were calculated for the different species using FAO amino acid patterns. Crude protein (N × 6·25) ranged between 8·8% in Afzelia bella (calyx) and 33·2% in Parkia clappertoniana. Afzelia bella (calyx) had the highest values of valine ( 8·9 g 16 gN ); iso-leucine ( 12·5 g 16 gN ); leucine ( 16·8 g 16 gN ) and phenylalanine ( 7·1 g 16 gN ). Parkia clappertoniana, Afzelia bella (seed), Irvingia gabonensis, Monodora tenuifolia, Pterocarpus osun and Cedrella odorata had the highest values of lysine ( 8·0 g 16 gN ); histidine ( 6·3 g 16 gN ); methionine ( 1·9 g 16 gN ); tyrosine, ( 9·1 g 16 gN ); tryptophan ( 2·5 g 16 gN ) and cystine ( 3·6 g 16 gN ), respectively. The proportion of total nitrogen derived from essential amino acids ( E T N ratio) varied from 1·0 in Carapa procera to 4·2 in Afzelia bella (calyx). Chemical score ranged between 22·4 in Afzelia bella (calyx) and 64·7 in Khaya ivorensis.
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