Symbiotic sheep milk cheese containing Moringa oleifera extract and Bifidobacterium pseudolongum INIA P2

Abstract

Healthy non-bovine functional dairy products are reaching high interest among consumers. In the present study, an aqueous polyphenol-rich Moringa oleifera extract (MoE) and a Bifidobacterium strain of human origin (B. pseudolongum INIA P2) were added, alone or in combination, for the manufacture of three experimental and one control sheep milk cheeses. In general, addition of 2.05 g of lyophilized MoE per 100 g of curd did not affect cheese dry matter or lactococci starter counts during ripening. B. pseudolongum INIA P2 showed good viability in cheese during ripening, and after simulated major gastrointestinal conditions, reaching levels above 7 log CFU / g of cheese. Cheeses with MoE showed lower pH, higher proteolysis and aminopeptidase activity than control cheese. MoE impoved functional properties, significantly (P < 0.01) increasing total phenolic content (TPC) and, especially, antioxidant capacity, with respect to control cheese. MoE modified cheese colour and volatile profile. Cheeses with MoE were darker in colour with higher red and yellow components than control cheese. Several volatile compounds were only detected in cheeses with MoE, indicating their plant origin. On top of that, increased levels of compounds originating from amino acid catabolism were present in these cheeses, as a result of their higher proteolytic and peptidolytic indexes. The symbiotic cheese with MoE and B. pseudolongum INIA P2 could confer beneficial effects on consumers' health by increasing polyphenol bioavailability and contributing to the host antioxidant capacity.