| With acid value, peroxide value, iodine value, saponification value, fatty acid composition, and 22 kinds of inorganic element contents as quality evaluation indicators, and DPPH free radical scavenging rate as an antioxidant activity evaluation indicator, the quality and antioxidant activity of Sacha inchi oils from Puer, Yunnan, China, Xishuangbanna, Yunnan, China, Thailand and Peru were compared. The results showed that the acid values of Sacha inchi oils from Puer, Yunnan, China, Xishuangbanna, Yunnan, China, Thailand and Peru were 0.98, 0.84, 1.02, 1.15 mgKOH/g respectively, the peroxide values were 0.07, 0.06, 0.10, 0.11 g/100 g respectively, the iodine values were 194, 190, 191, 194 gI/100 g respectively, and the saponification values were 192, 190, 194, 193 mgKOH/g respectively, and all of these were within the scope of the food industry standard LS/T 3264-2019. The main fatty acid compositions of Sacha inchi oil were palmitic acid, stearic acid, oleic acid, linoleic acid, and linolenic acid. The contents of linolenic acid were the highest, followed by the linoleic acid. The contents of unsaturated fatty acids were more than 91%. The contents of heavy metal elements including Al, Co, Ni, As, Mo, Ag, Cd, Sb, Ba, Hg, Tl, Pb in Sacha inchi oils from different producing areas were extremely low, and they all contained Na, Mg, K, Ca, Mn, Zn inorganic elements. The Sacha inchi oil from Puer, Yunnan, China contained higher Fe elements. When the mass concentration was 25 mg/mL, the DPPH free radical scavenging rates of Sacha inchi oil from the four producing areas were all above 80%, and the DPPH free radical scavenging rate of Sacha inchi oil from Puer, Yunnan, China was the highest. |
