Abstract
Anthracene as a chemical probe is usually used to trap the singlet oxygen and then detection and quantification can be based on absorbance. In this study, oxidation of anthracene declared that rate of singlet oxygen quenching in the presence of pasipay (passiflora incarnate L.) as a natural antioxidant, 1,4 Diazabicyclo [2.2.2] octane (DABCO) as a well‐known singlet oxygen scavenger and highly effective synthetic antioxidants in food industry such as Butylated hydroxytoluene (BHT), Butylated hydroxyanisole (BHA), tert‐Butylhydroquinone (TBHQ) decreased in the order of DABCO >pasipay > TBHQ > BHT > BHA. On the other hand, lipid photooxidation is the undesirable chemical process in which singlet oxygen result in the peroxidation of fatty acids. The results of this study also showed that oleic acid oxidation with singlet oxygen in the presence of pasipay (contains 0.4576 mg flavonoid compounds) diminished about 11% which shows pasipay has an effective role to inhibit lipid peroxidation.
Highlights
Oxygen molecule in its ground state has two unpaired electrons and when oxygen molecule has excess energy, these unpaired electrons in the external orbital can be pair and generate singlet oxygen (Min & Boff, 2002)
Lipids can be a target of singlet oxygen due to the electrophilic inherent, this reactive species attacked to unsaturated fatty acid and produce lipid hydroperoxides as primary products (Girotti, 1998)
Natural antioxidants act (a) as reducing agents, (b) as free radical scavengers, and (c) as quenchers of the formation of singlet oxygen. They can be used in the food industry and there is evidence that they may exert their antioxidant effects within the human body (Hamid, Aiyelaagbe, Usman, Ameen, & Lawal, 2010; Koski et al, 2002)
Summary
Oxygen molecule in its ground state has two unpaired electrons and when oxygen molecule has excess energy, these unpaired electrons in the external orbital can be pair and generate singlet oxygen (Min & Boff, 2002). Natural antioxidants act (a) as reducing agents, (b) as free radical scavengers, and (c) as quenchers of the formation of singlet oxygen. They can be used in the food industry and there is evidence that they may exert their antioxidant effects within the human body (Hamid, Aiyelaagbe, Usman, Ameen, & Lawal, 2010; Koski et al, 2002). There are few studies on the efficacy of natural antioxidant as O2 (1Δg) quenchers and their roles in the prevention of lipid oxidation (Niki, 2015; Terao, Minami, & Bando, 2010) because scavenging of DPPH free radical is the basis of a common antioxidant assay and most often an overall antioxidant effect was measured. Singlet oxygen has not radical nature. (Ruiz-González et al, 2017) This project was designed to characterize the antioxidant potential of passiflora incarnate L. as a natural antioxidant in compare with well-known singlet oxygen scavenger such as DABCO and the highly effective antioxidants such as BHA, BHT, and TBHQ
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