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Type 4 Resistant Starch(RS—4)Enriched Breads Increase Portal Vein Plasma GLP—1 and PYY Concentrations in Rats
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JPY
Abstract
Objectives It was studied whether the effect of RS4-type resistant starch(RS-4)to increase the portal plasma PYY and GLP-1 concentrations is affected by bread-baking process or not. Methods Rats were fed one of five diets AIN-93-based diet which 250 g of carbohydrate source were replaced by freeze-dried bread with or without RS-4. Hydroxypropyl starch(HPS)and distarch phosphate(DP)were used as RS-4 source. Diet without RS-4 was called W diet, and diet with RS-4(20% or 40%)was called W, DP20, DP40, HPS20 and HPS40 diet, respectively. The DF content in W, DP20, DP40, HPS20 and HPS40 diet was 11, 65, 118, 54, and 111 g╱kg diet, respectively. Results The pH and amounts of total SCFA in cecal contents in rats fed the DP20, DP40, HPS20, and HPS40 diet were significantly lower and higher than that in rats fed the W diet. The concentrations of GLP-1 and PYY in the portal vein plasma increased with increasing the amount of total SCFA in cecal contents. Food intake decreased with increasing the concentrations of GLP-1, PYY, and GLP-1+PYY in the portal vein plasma. Conclusions The present results show that RS-4 enriched breads increased portal vein plasma GLP-1 and PYY concentrations in rats, and the effect to increase the concentrations of GLP-1 and PYY in portal vein blood of RS-4 was not affected by bread-making process.
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