Uji aktivitas ekstrak biji kacang merah (Vigna angularis) sebagai Inhibitor Enzim α-Amilase dan Pengaruhnya terhadap kadar glukosa darah postprandial Tikus (Rattus norvegicus) Jantan Galur Sprague-Dawley = The Activity of Adzuki Bean (Vigna angularis) Extract as an Inhibitor of α-Amylase and its Effect on postprandial blood glucose levels of Male Rat (Rattus norvegicus) Sprague-Dawley Strain