Co-encapsulation of Dictyophora indusiata to improve Lactobacillus acidophilus survival and its effect on quality of sweet fermented rice (Khoa-Mak) sap beverage

Abstract

Egg and fruiting body of bamboo mushroom at the concentrations of 0, 0.8, 1 and 3% (w/v) were added during encapsulation of Lactobacillus acidophilus TISTR 2365 in alginate beads. The influence of addition of co-encapsulated, encapsulated and free probiotic cells on the microbiological, physico-chemical, antioxidant and sensory properties of Khoa-Mak sap beverages during storage at 4 °C for 35 days were investigated. All encapsulation formulations indicated high encapsulation yields of 95.72-98.86% and also influenced positively several characteristics such as ethanol, titratable acidity, reducing sugar, probiotic survival and sensory properties. High viability of L. acidophilus (> 8 log CFU/g) in all bead formulations was maintained above the recommended minimum therapeutic throughout storage of Khoa-Mak sap beverages. Moreover, the incorporation of bamboo mushroom, particularly 3% egg stage in beads (AEB3) increased the survival of L. acidophilus in Khoa-Mak saps during storage. The addition of either egg or fruiting body of bamboo mushroom from 0.8 to 3% in beads resulted in the significant increasing of total phenolic contents and their DPPH radical scavenging activities, and also without negative impact sensory attributes.

Supplementary information: The online version contains supplementary material available at 10.1007/s13197-021-05101-9.

Keywords: Bamboo mushroom; Co-encapsulation; Khoa-Mak sap; Probiotic; Storage.