Steam-exploded Laminaria japonica polysaccharide improved set yogurt quality: Based on flavor, storage stability and dynamic in vitro digestive properties

Abstract

Laminaria japonica polysaccharide (LJP) is an important nutrient of Laminaria japonica, and the extraction rate and the bioactivity of LJP were improved with the steam explosion (SE) method according to our preliminary research. Here, the effects of steam-exploded Laminaria japonica polysaccharide (LJPS) on flavor, storage stability, and dynamic in vitro digestive properties of set yogurt were investigated in this study. The results suggested that the addition of 0.1 % LJP and LJPS maintained the taste and the odor of set yogurt. In addition, the water holding capacity was increased significantly by 1.067 and 1.066 folds with LJP and LJPS compared with the control groups, respectively. Furthermore, the water distribution was optimized with the addition of LJP and LJPS. In particular, LJP improved the adhesiveness of set yogurt by texture profile analysis. Moreover, the viability of Lactobacilli and Lactococci was sustained during the dynamic in vitro digesting process with LJP and LJPS. Overall, the study provides theoretical guidance for the application of marine plant polysaccharides in the food industry.