Proximate composition and selected physicochemical properties of the seed, pulp and oil of sour sop (Annona muricata)

Author: Onimawo I.A.

Source: Plant Foods for Human Nutrition, Volume 57, Number 2, 2002 , pp. 165-171(7)

Publisher: Springer

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Abstract:

Proximate composition and physicochemical analyses were carried out on the seed, pulp and extracted oil of sour sop ( Annona muricata). The results showed that the seed contained 8.5% moisture, 2.4% crude protein, 13.6% ash, 8.0% crude fiber, 20.5% fat and 47.0%carbohydrate. The seed also contained 0.2% water soluble ash, 0.79%titratable acidity and 17.0 mg calcium/100 g. The pulp was found to contain 81% moisture, 3.43% titratable acidity and 24.5%non-reducing sugar. Selected physicochemical characteristics included refractive indices of 1.335 for the seed and 1.356 for the pulp, specific gravities of 1.250 for the seed and 1.023 for the pulp, pH values of 8.34 for the seed and 4.56 for the pulp, and soluble solids contents of 1.5 ^°Brix for the seed and 15 ^°Brix for the pulp. The extracted oil (20.5% yield) had a 60.43% unsaponifiable value, 23.54 KOH/g acid value, 100.98 K0H/g saponification value, 1.1 K0H/g peroxide value, 1.464 refractive index, 5.77 pH, 69.5 ^°Brix sosluble solids and 0.2900 specific gravity.

Keywords: Annona muricata; Oil yield; Physicochemical properties; Proximate composition; Sour sop

Language: English

Document Type: Regular paper

Affiliations: 1: Biochemistry Department, Ambrose Alli University, P.M.B. 14 Ekpoma, Edo State, Nigeria

Publication date: 2002-01-01