Effects of Accelerated Storage on the Quality of Kenaf Seed Oil in Chitosan-Coated High Methoxyl Pectin-Alginate Microcapsules

• Published in: Journal of food science 2016-10, Vol.81 (10), p.C2367-C2372
• Main Authors: Leong, Mei-Huan, Tan, Chin-Ping, Nyam, Kar-Lin
• Format: Article
• Language: English
• Subjects: Alginates; Aniline Compounds - metabolism; antioxidant activity; Antioxidants; Antioxidants - analysis; Antioxidants - pharmacology; Assaying; Biphenyl Compounds - metabolism; Capsules; Chitosan; co-extrusion technology; Coextrusion; correlation; Drug Compounding; Encapsulator B-390; Fatty acids; Glucuronic Acid; Hexuronic Acids; Hibiscus - chemistry; Hibiscus cannabinus; Humans; Kenaf; Lipid Peroxidation; Lipids; Oxidation; Oxidation-Reduction; oxidative stability; Pectins; Phenols - analysis; Phenols - pharmacology; Picrates - metabolism; Plant Extracts - pharmacology; Plant Oils - metabolism; Plant Oils - pharmacology; Seeds; Seeds - chemistry; Stability; Thiobarbituric Acid Reactive Substances; Vitamin E
• ISSN: 0022-1147; 1750-3841
• DOI: 10.1111/1750-3841.13442

The objective of this research was to study the oxidative stability and antioxidant properties of microencapsulated kenaf (Hibiscus cannabinus L.) seed oil (MKSO) produced by co‐extrusion technology upon accelerated storage. The combination of sodium alginate, high methoxyl pectin, and chitosan were used as shell materials. The oxidative stability of the kenaf seed oil was determined by iodine value, peroxide value, p‐Anisidine value, total oxidation (TOTOX), thiobarbituric acid reactive substances assay, and free fatty acid content. Total phenolic content, 2,2′‐azino‐bis(3‐ethylbenzothiazoline‐6‐sulphonic acid) cation radical‐scavenging assay and 2,2‐diphenyl‐1‐picrylhydrazyl radical scavenging assay were used to examine the antioxidant properties of oils. Oxidative stability tests showed that bulk kenaf seed oil (BKSO) was oxidized significantly higher (P < 0.05) than MKSO. The total increment of TOTOX value of BKSO was 165.93% significantly higher (P < 0.05) than MKSO. Co‐extrusion technology has shown to be able to protect kenaf seed oil against lipid oxidation and delay the degradation of natural antioxidants that present in oil during storage. Practical Application Kenaf seed oil contains polyunsaturated fatty acids (PUFA) and phytosterols, which are beneficial to human health. However, the PUFA in kenaf seed oil is susceptible to lipid oxidation, which degrades its nutritional value. Co‐extrusion technology was shown to be able to protect kenaf seed oil against lipid oxidation and delay the degradation of natural antioxidants that present in oil during storage.