title: Functional properties of autolysate and enzymatic hydrolysates from yam tsukuneimo (Dioscorea opposita Thunb.) tuber mucilage tororo: antioxidative activity and antihypertensive activity.
abstract: Yam tsukuneimo tuber mucilage tororo hydrolysates were prepared by autolysis and three different peptic enzymes. Except for pepsin hydrolysate, tororo was perfectly digested. Each hydrolysate for 100 mg/ml significantly prolonged the induction period of auto-oxidation of linoleic acid, which was similar to 5 mM ascorbic acid. These hydrolysates also possessed high scavenging activities such as superoxide anion radicals, hydroxyl radicals, and DPPH radicals. Moreover, high antihypertensive activities were detected in these hydrolysates except for autolysate, which were similar to various fermented foods such as miso, natto, sake, cheese, and so on. Present findings suggest that yam tsukuneimo tuber mucilage tororo may be useful for preventing diseases associated with reactive oxygen species and blood pressure in the body system and it can fully absorb the useful components from it to digest using the gastrointestinal enzymes.
authors.affiliation: Graduate School of Agricultural Sciences, Yamagata University, Yamagata, 9978555 Japan ; The United Graduate School of Agricultural Sciences, Iwate University, Iwate, 0208550 Japan ; Graduate School of Prince of Songkla University, Hat Yai, Songkhla 90112 Thailand.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Nagai
authors.affiliation: Nagoya Research Institure, Toyoake, Aichi 4701131 Japan.
authors.forename: Nobutaka
authors.initials: N
authors.lastname: Suzuki
authors.affiliation: National Fisheries University, Yamaguchi, 7596595 Japan.
authors.forename: Norihisa
authors.initials: N
authors.lastname: Kai
authors.affiliation: National Fisheries University, Yamaguchi, 7596595 Japan.
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Tanoue
keywords: Antihypertensive activity; Antioxidant activity; Enzymatic hydrolysis; Free radical scavenging activity; Yam tsukuneimo tuber mucilage tororo