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Effect of storage conditions on the degradation of roselle (Hibiscus sabdariffa) seeds oil
Abstract
Degradation of edible oil toward rancidity is wasteful and/or health challenging. In this study, oil extracted from Roselle seeds was analyzed for elemental and microbial content. The oil under different conditions of storage (lightened L, dark air-free AF and dark air-tight/covered ATD conditions) were progressively studied for 16 weeks to investigate the changes in the physicochemical properties signaling deterioration. Fourier transformed infrared (FTIR) analysis before and after the storage period were carried out to investigate the changes in the functionality of the oils. Elemental analysis presented Fe, Ca. Zn, K and Na in 159.615 mg/l, 370.10 mg/l, 27.918 mg/l 600 mg/l and 170 mg/l respectively; phytochemical analysis presented saponins only while microbial analysis indicated the presence of bacteria and fungi. The changes in physicochemical properties and the FTIR spectra over the storage period revealed different rates and fashions of deterioration. From the study, the conditional degradation of Roselle seed oil was least severe in ATD compared with other typical storage conditions. The oil will therefore be expected to have the longest shelf-life in ATD.
Keywords: Roselle seed, oil, storage conditions, degradation/deterioration.
