title: The nutraceutical role of the Phaseolus vulgaris alpha-amylase inhibitor.
abstract: The present review assesses the potential of the Phaseolus vulgaris alpha-amylase inhibitor isoform 1 (alpha-AI1) starch blockers as a widely used remedy against obesity and diabetes. Consumption of the alpha-amylase inhibitor causes marginal intraluminal alpha-amylase activity facilitated by the inhibitor's appropriate structural, physico-chemical and functional properties. As a result there is decreased postprandial plasma hyperglycaemia and insulin levels, increased resistance of starch to digestion and increased activity of colorectal bacteria. The efficacy and safety of the amylase inhibitor extracts, however, depend on the processing and extraction techniques used. The extracts are potential ingredients in foods for increased carbohydrate tolerance in diabetics, decreased energy intake for reducing obesity and for increased resistant starch. Research developments in the distribution and biosynthesis of the alpha-amylase inhibitor, relevant physico-chemical properties, the molecular starch-blocking mechanism, anti-obesity and anti-diabetes effects, safety of extracts and the need for research into their potential anti-colorectal cancer effect are discussed.
authors.affiliation: State Key Laboratory of Food Science and Technology, Southern Yangtze University, 1800 Lihu Avenue, Wuxi, Jiangsu 214122, China.
authors.forename: Wokadala Cuthbert
authors.initials: WC
authors.lastname: Obiro
authors.forename: Tao
authors.initials: T
authors.lastname: Zhang
authors.forename: Bo
authors.initials: B
authors.lastname: Jiang
mesh_terms: D019440:Anti-Obesity Agents / Q000627:therapeutic use; D002627:Chemistry, Physical; D003920:Diabetes Mellitus / Q000188:drug therapy; D019587:Dietary Supplements; D006801:Humans; D007004:Hypoglycemic Agents / Q000627:therapeutic use; D009765:Obesity / Q000188:drug therapy; D037121:Plant Lectins / Q000009:adverse effects / Q000737:chemistry / Q000627:therapeutic use*
chemical_list: D019440:Anti-Obesity Agents; D007004:Hypoglycemic Agents; D037121:Plant Lectins; C061510:alpha-amylase inhibitor, Phaseolus vulgaris