Enhanced Antioxidant and Anti-inflammatory Activities ofMonascus pilosusFermented Products by Addition of Turmeric to the Medium

Abstract

Monascus sp. fermented products are known for their antihypercholesterolemic effects; however, their antioxidant and anti-inflammatory activities are different from those of many plant-derived foods. To evaluate the effect of turmeric addition into the medium on the antioxidant and anti-inflammatory activities of Monascus pilosus fermented products, we cultured uninoculated PDB medium (PDB), inoculated PDB medium (MP), uninoculated turmeric-containing PDB medium (PDBT), and inoculated turmeric-containing PDB medium (MPT). The broth and mycelia were collected, freeze-dried, and extracted to evaluate their free radical scavenging and iron-chelating activities, inhibition of peroxidation, phenolic and curcuminoid contents, and cellular antioxidant activity. The effects of the extracts on cell viability, cytokines and nitric oxide (NO) production, and expression of enzymes that regulate antioxidation and inflammation were also evaluated. The results showed that MPT had a significantly higher antioxidant activity than PDB, MP, and PDBT at all fermentation time points; moreover, the fermentation process significantly increased the phenolic and curcuminoid contents of MPT. As compared with MP, MPT had a more significant effect on down-regulating the production of NO and TNF-alpha as well as the expression of inducible nitric oxide synthase, cyclooxygenase-2, glutathione peroxidase, superoxidase dismutase, and catalase. After the inherent levels of antioxidant and anti-inflammatory capacities were increased, the modified M. pilosus fermented product demonstrated a higher antiatherosclerotic value than the unmodified product.