Amino Acids Profile of the Eyes and Brain of Anas platyryncos

Emmanuel Ilesanmi Adeyeye^1*, Abdul Ademola Olaleye² & Adeolu Jonathan Adesina³

¹Chemistry Department (Analytical Unit), Ekiti State University, Ado-Ekiti, Nigeria
²Chemistry Department, Federal University Dutse, Jigawa State, Nigeria
³Chemistry Department (Analytical Unit), Ekiti State University, Ado-Ekiti, Nigeria

Emmanuel Ilesanmi Adeyeye, Chemistry Department (Analytical Unit), Ekiti State University, Ado-Ekiti, Nigeria.

Keywords: Amino Acids; Brain; Duck; Eyes

Abstract

The amino acid (AA) composition of the eyes and brain of domestic duck (Anas platyryncos) were reported using standard analytical techniques. Among the amino acids investigated, glutamic acid was most abundant in both samples with values ranging between 12.50-15.60g/100g crude protein (CP). The most concentrated essential amino acid (EAA) was leucine (7.68-8.04g/100g CP) whereas cystine was least concentrated with 0.860g/100g CP in each of the samples. The total acidic amino acids in the samples (21.7-23.7g/100g CP) were greater than the total basic amino acids (14.5-16.2g/100g CP). The Leucine/Isoleucine (Leu/Ile) ratio (1.95-2.85) showed that Leu > Ile in both samples. The predicted protein efficiency ratio (P-PER₁ and P-PER₂) were 2.25-2.37 and 2.24-2.31, respectively. The isoelectric point (pI) ranged between 4.97-5.26. Based on the whole hen’s egg, histidine (His) (1.12-1.18), glutamic acid (Glu) (1.16-1.19), proline (Pro) (1.01-1.17) and glycine (Gly) (1.86-2.32) had higher amino acid scores which was greater than 100% in both samples while cystine (Cys) (0.478) was limiting in the brain and isoleucine (0.427) had the least score in the eyes. On provisional amino acid scoring pattern, the limiting amino acid was isoleucine with values recorded as 0.90 (brain) and 0.598 (eyes). Essential amino acid scores based on pattern for pre-school child (2-5 years) showed that the samples would supply the required EAAs for this category. Generally, correlation analysis showed that significant differences existed between the samples in all the parameters determined at ? _{= 0.05} critical level.

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