Yogurt was prepared with different substitution ratio [10, 30, and 50% (w/w)] of skim milk with enzymatically hydrolyzed purple sweet potato powder (EHPSPP) and fermented at 40 o C for 15 h. Fermentation characteristics and antioxidant activities of the yogurt were evaluated in terms of acid production (pH and titratable acidity) and lactic acid bacterial counts and DPPH radical scavenging activity, respectively. After 15 h fermentation, titratable acidity of EHPSPP yogurt was 0.80โ0.89% and was lower than that (0.93%) of yogurt made without EHPSPP. The acid production and the number of viable lactic acid bacterial cell decreased with increasing the substitution ratio. The sensory score of EHPSPP yogurt prepared with 30% substitution ratio showed the highest values in taste and overall acceptability among the tested yogurt preparations. DPPH radical scavenging activity increased with increasing the substitution ratio in yogurt fermented for 12 h. The total phenolic content of 30% EHPSPP yogurt was 40% higher than that of skim milk yogurt. These results suggest that EHPSPP can be used as substituent of skim milk and the optimum substitution ratio is around 30%.
To develop red pepper paste and soy sauce pickles with Maengjong bamboo (Phyllostachys pubescens) shoots, the pretreatment conditions of bamboo shoots and the physicochemical and sensory properties of both pickles according to incubation period were investigated. For pretreatment, wet heating in boiling water was more effective to soften the fresh bamboo shoots than dry heating at 190 o C. To remove the disagreeable pungent taste of the shoots, the heated shoots were soaked in 10% NaCl solution for 1 hour and dried at 50 o C for 8 hours. Changes of the quality characteristics of the red pepper paste and soy sauce pickles using pretreated bamboo shoots were observed at 25 o C for 6 days. The pH of both of the pickles was stably maintained at 4.0~5.5 for 6 days. The salt value of the red pepper paste pickles considerably increased from 7.21% to 9.36%. The lightness and yellowness of the color values of both pickles decreased and the redness of the red pepper paste pickles increased with increase of the incubation time. The sensory evaluation, color, taste, texture, and overall acceptability of both pickles were enhanced with increase of the incubation time. Further, the proper incubation period for both pickles was suggested to be 6 days.
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