Abstract
Punicalagin and ellagic acid are the major polyphenols present in pomegranate peels. The contents of α‐punicalagin, β‐punicalagin, and ellagic acid in the pomegranate peels were approximately 75, 72, and 20 µM, respectively. The reactions of polyphenols in pomegranate peels with sodium nitrite under simulated stomach conditions were studied. The reactions decreased the polyphenolic contents of the pomegranate peels and accompanied the formation of nitroso compounds. The oxidation rates followed the order ellagic acid ＜α‐punicalagin ≈ β‐punicalagin. The results suggested that the reactions can occur in the stomach after a meal, while the pH changes from 2 to 4.5.
Highlights
Pomegranate (Punica granatum L.) is deciduous shrubs or dungarunga, which is located in tropical and subtropical regions (Du, Li, Zhang, Wang, & Zhang, 2018)
This report explores and analyzes the reactions of polyphenols in pomegranate peel with nitrite under simulated stomach conditions to discuss the functions of pomegranate peels
The results indicated that with increasing nitrite concentration, the concentrations of α‐punicalagin, β‐ punicalagin, and ellagic acid decreased gradually
Summary
Pomegranate (Punica granatum L.) is deciduous shrubs or dungarunga, which is located in tropical and subtropical regions (Du, Li, Zhang, Wang, & Zhang, 2018). The pomegranate peel is a by‐product that composes approximately half of the whole fruit (Al‐Said, Opara, & Al‐Yahyai, 2009). It is a traditional ingredient in Asian cuisine. Pomegranate peel extracts have a potential to be used as food additives (Akhtar, Ismail, Fraternale, & Sestili, 2015). Pomegranate peel extracts have been proven to have significant antioxidant capacities in many studies. This report explores and analyzes the reactions of polyphenols in pomegranate peel with nitrite under simulated stomach conditions to discuss the functions of pomegranate peels. The ethyl acetate extract was evaporated under nitrogen in a water bath, and the residue was dissolved in 1 ml mobiles phases. The solutions were centrifuged at 10,000 g for 2 min and used for HPLC analysis
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