RESEARCH ARTICLE


Stabilized Avocado Pastes: Chemical Contents and Oxidative Changes During Storage



H.D. Mepba*, 1, T.G. Sokari2, L. Eboh3, E.B. Banigo1, D.B. Kiin-Kabari1
1 Department of Food Science & Technology, Rivers State University of Science & Technology, Port Harcourt, Nigeria
2 Department of Applied & Environmental Biology, Rivers State University of Science & Technology, Port Harcourt, Nigeria and
3 Department of Home Economics, University of Uyo, Uyo, Nigeria


© 2008 Mepba et al.;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at theDepartment of Food Science & Technology, Rivers State University of Science & Technology, Port Harcourt, Nigeria; E-mail: mepba12002@yahoo.co.uk


Abstract

The nutritive compositions and oxidative stabilities of processed avocado pastes at ambient (30±1°C, RH80%) and refrigerator (5-6oC) storage temperatures were evaluated and studied. Avocado pulp was blended with ingredients, chilled, kneaded and shaped. For oxidative studies varying concentrations and combinations of Ascorbyl palmitate (AP) and Propyl gallate (PG) were blended with the pulp. Products were evaluated for their proximate composition, minerals and vitamin C contents. Stored products at ambient and refrigerated temperatures for 16 days, were evaluated for contents of free fatty acids (FFA), peroxide values (PV), thiobarbituric acid values (TBA), also changes in colour, odour and flavour/ aroma. The protein, carbohydrates and lipid contents of control (untreated) and stabilized pastes ranged from 2.7- 2.8%, 9.2 - 9.5% and 32.8-33.4%, respectively. The results of mineral analysis and their implications on human nutrition are discussed. Vitamin C contents ranged from 20.6-22.8mg/100g. Generally, stored products had lower FFA contents, PV and TBA values from days 0-4 and 0-8 at ambient and refrigerator temperatures, respectively. Highest percent FFA, PV and TBA values were obtained in the control samples while least values were recorded in products stabilized with AP+PG, 200/200ppm. The efficacy of the preservatives were of the order of AP+PG, 200/200ppm > AP+PG, 100/100ppm>AP, 200ppm>PG200ppm>untreated control. AP+PG, 200/200ppm significantly (P≥0.05) reduced % FFA, PV and TBA values in stored products and synergistically stabilized their colour, odour and flavour/aroma for 4 and 8 days at ambient and refrigerator storage temperatures, respectively.

Keywords: Avocado pastes, ascorbyl palmitate, propyl gallate, stabilized, stored products, treated, oxidative, composition, minerals, vitamin C, ambient, refrigerated.