Antioxidant activity of grapefruit seed extract on vegetable oils

✍ Scribed by Armando, Carrasquero; Maythe, Salazar; Beatriz, Navas Petra

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 213 KB
• Volume: 77
• Category: Article
• ISSN: 0022-5142
• DOI: 10.1002/(sici)1097-0010(199808)77:4<463::aid-jsfa62>3.0.co;2-1

✦ Synopsis

The antioxidant activities of a grapefruit seed extract (GFSE) which contains tocopherols, citric acid and ascorbic acid, were investigated in vegetable oils. Di †erent amounts of GFSE in powder were dissolved in a mixture of soybean oilÈsunÑower oil. The oxidation was carried out in an AOM equipment at temperatures of 98É7¡C, 75¡C and 66É5¡C. The results indicated prooxidant e †ects of GFSE at 97É8¡C and 75¡C possibly due to a blockade e †ect of a hydroxyl compound by tocopherol. The inhibitor reaction order at these temperatures were 0É902 and 0É465, respectively, while at 66É5¡C the oxidation rate was inverse to GFSE concentration with reaction order of [0É420. These results seem to indicate di †erent reaction mechanisms depending on temperature conditions. The blockade e †ects was explained on the basis of a proposed complex between tocopherol and citric acid molecules.

1998 SCI.