Effects of Extraction Temperature and Particle Size on Quality of Edible Oil from Podocarpus Falcatus Seed by Aqueous Method, Ethiopia

Abstract

Introduction: The kernel from Podocarpus falcatus has potential for the production of edible oil. The oil is currently extracted using a traditional inefficient method for the purpose of house hold consumption. The objective of this study was to investigate the effects of particle size and extraction temperature on yield and quality of oil extracted from P. Falactus seeds by aqueous method. The experiment was carried out in a completely randomized design that comprised of three aqueous temperatures (70, 80 and 90⁰C) and three particle sizes (0.25, 0.50, and 0.75mm). Results: The maximum oil yield in this study was obtained 22.29 and 22.38±2.10% at extraction temperature of 70⁰C and at the particle size of 0.5mm respectively. Particle size and oil yield have correlation in that higher extraction was obtained (25%) as the particle size decreased. The particle size and temperature interaction had a positive effect on yield and maximum oil yield (25.25%) was obtained by the combination of 0.25mm particle size and 70⁰C. The peroxide, iodine and saponification values were obtained with acceptable range by the combination of 0.25mm and within the acceptable limit of edible oil 70⁰C. Yield and oil quality were influenced by extraction particle size and temperature.

Keywords: Edible oil, Physicochemical, Aqueous, extraction, temperature, particle size, Podocarpus falcatus seed

DOI: 10.7176/FSQM/114-01

Publication date: April 30^th 2022