You can download this article for your study. This method easy.
"In Vitro a-Glucosidase Inhibition and Antioxidative Potential of an Endophyte Species (Streptomyces sp. Loyola UGC) Isolated from Datura stramonium L". Curr Microbiol (2013) 67:69–76. DOI 10.1007/s00284-013-0329-2.
if you unable to download, text me I send you the paper