Purple sweet potato powder was obtained from Yundoo Co.Uijeongbu Korea (,). Agar (AG) was purchased from Daejung Chemical.& Metals Co, Ltd. (Shiheung Korea), and potato starch (PS was.)Purchased from Junsei Chemical Co, Ltd. Tokyo Japan (,). Anhydrous.Glycerin (99%), hydrochloric acid (HCl), and buffer solutions.From pH 2.0 - 8.0 and 10.0 were purchased from Daejung Chemical.& Metals Co, Ltd. (Shiheung Korea). Buffer, solution of pH 9.0 was.Obtained from Junsei Chemical Co, Ltd. Tokyo Japan (,). Sodium.Hydroxide (NaOH) was obtained from Yakuri Pure Chemicals, Co.Ltd. Kyoto Japan (,).
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