Functional Properties of Prickly Pear Cactus Fruit Peels Undergoing Supplemental Irrigation and Fruit Storage Conditions.

Prickly pear cactus fruit peels have been seen as organic waste. This study explored the effect of supplemental irrigation during fruit growth of 'Roja Lisa' (Opuntia ficus-indica) prickly pear cactus on the antioxidant, hypoglycemic and hypolipidemic properties of peel extracts from fruits collected at harvest and after storage conditions. The treatments were non-irrigated and supplemental irrigation and the storage conditions were cold or room temperature, and freshly harvested fruit. After each fruit quality evaluation, peels from each treatment combination were pooled and the concentrations of phenolic compounds, inhibition of an in vitro digestive enzyme, antioxidant capacity, and in vivo hypoglycemic (- control = 268 mg/dL versus fruit peel extracts = 204 mg/dL at 30 min) and hypolipidemic (- control = 203 mg/dL versus fruit peel extracts = 148 mg/dL at 30 min) properties were determined. Therefore, fruit peels could potentially be harnessed for human health benefits, instead of treated as organic waste.

Cookies elaborated with oat and common bean flours improved serum markers in diabetic rats.

BACKGROUND: Common beans have been associated with anti-diabetic effects, due to its high content of bioactive compounds. Nevertheless, its consumption has decreased worldwide. Therefore, there is an increasing interest in the development of novel functional foods elaborated with common beans. The aim of this study was to evaluate the anti-diabetic effect of oat-bean flour cookies, and to analyze its bioactive composition, using commercial oat-wheat cookies for comparative purposes. RESULTS: Oat-bean cookies (1.2 g kg-1 ) slightly decreased serum glucose levels (∼1.1-fold) and increased insulin levels (∼1.2-fold) in diabetic rats, reducing the hyperglycemic peak in healthy rats (∼1.1-fold). Oat-bean cookies (0.8 and 1.2 g kg-1 ) exerted a greater hypolipidemic effect than commercial oat-wheat cookies (1.2 g kg-1 ), as observed in decreased serum triglycerides and low-density lipoprotein cholesterol. Furthermore, the supplementation with 1.2 g kg-1 oat-bean cookies decreased atherogenic index and serum C-reactive protein levels, suggesting their cardioprotective potential. The beneficial effect of oat-bean cookies was associated with their high content of dietary fiber and galacto oligosaccharides, as well as chlorogenic acid, rutin, protocatechuic acid, ß-sitosterol and soyasaponins. CONCLUSION: These results suggest that common beans can be used as functional ingredients for the elaboration of cookies with anti-diabetic effects. © 2017 Society of Chemical Industry.