Nutritional Characterization of White Grape Pomace: Potential Feed Additive in Ruminants’ Nutrition
Keywords:
Antioxidant potential, bioactive compounds, nutritional quality, white grape pomaceAbstract
In today's food industry, fortifying food products with several nutrients is a priority, and animal nutrition represents a key strategy for achieving this goal. Nevertheless, the scarcity and high costs of conventional feedstuffs lead to investigation of industrial by-products as alternative solutions in livestock nutrition. White grape pomace, a by-product of the winery industry, is well-known for its rich resveratrol content. Nevertheless, in addition to this, it can present significant quantities of other nutrients and antioxidant compounds, which exert beneficial effects when incorporated into ruminants’ nutrition. Our study revealed a remarkable concentration of the white grape pomace nutrients, with important minerals, particularly manganese (106.35 mg/kg). The fatty acids profile showed a high composition of polyunsaturated fatty acids (65.05 g/100 g FAME), with a great amount of omega 3 fatty acids (62.66 g/100 g FAME). Concerning the antioxidant compounds, white grape pomace exhibited a concentration of 12.49 mg/g GAE for total polyphenols and 3.27 mg/kg for total flavonoids. Also, our study highlighted its high antioxidant potential, especially assessed through the DPPH radical scavenging assay (74.26 mM eq. Trolox), ABTS radical scavenging assay (75.07 mM eq. Trolox), and total antioxidant capacity (286.26 mM eq. ascorbic acid).
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