Fatty acid composition and lipid stability of cricket (Gryllus bimaculatus) flour preserved using ginger and garlic extracts

Abstract

Insect consumption is regarded as a sustainable diet with a high nutritional value and low environmental footprint. This study evaluated the fatty acid composition and oxidative stability of flour produced from crickets treated with ginger and garlic extracts. Ethanolic extracts of ginger, garlic and a combination were used to treat blanched cricket at a ration 1:4 (v/w). Treatments with sodium benzoate and distilled water served as positive and negative controls, respectively. Samples were dried in a hot air oven, milled to flour and packed in 10 μm polyethylene bags; stored at ambient conditions and evaluated on day on days 0, 30, and 60 of storage. Results showed that the major fatty acids in the flour were palmitic, oleic, and linoleic. During storage: palmitic acid increased from a range of 24.62 to 25.40 %; Oleic and linoleic acid decreased significantly ranging from 29.75 to 29.01 % and 32.85 to 32.21 %, respectively (p˂0.05). The ratio of polyunsaturated fatty acid to saturated fatty acid decreased significantly during storage. The acid value, peroxide value, and thiobarbituric acid reactive substances of flour increased significantly during storage (p˂0.05). The untreated flour was most affected than the spice treated flour. Treatment with a combination of ginger and garlic extracts is recommended due to the synergistic effect on the oil quality. Further investigation is required on the effects of various storage conditions and lengthy storage of spice preserved cricket flour on the fatty acid profile.