Hypolipidemic effects of lipid-lowering granulated tea preparation from Monascus-fermented grains (adlay and barley bran) mixed with lotus leaves on Sprague–Dawley rats fed a high-fat diet

Abstract

In this study, we used adlay and barley bran as substrates to prepare Monascus-fermented grains and discussed the optimum conditions for monacolin K production. Box–Behnken design results showed that the predicted maximum monacolin K yield (112.649 mg/kg) was close to the experimental value (110.556 ± 17.17 mg/kg) under optimum conditions (fermentation temperature, 28.76 °C; inoculation amount, 7.81%; and solid substrate concentration, 38.75 g/250 mL). We investigated the hypolipidemic effects of the lipid-lowering granulated tea preparation from Monascus-fermented grains (adlay and barley bran) mixed with lotus leaves enriched with bioactive mevinolins (natural statins) in hyperlipidemic rats for 7 weeks. Results showed that the lipid-lowering granulated tea decreased the body weight gain, serum total cholesterol (TC) and triglyceride (TG) levels, atherogenic index, and liver TC and TG levels. The preparation also increased the cecal weight, surface area, and content weight, as well as the concentrations of butyric acid. Furthermore, the preparation affected the intestinal microbiota and the liver.

Keywords

• Monascus-fermented grain
• Monacolin K
• Lipid-lowering granulated tea
• Hypolipidemic effect
• Animal experiment