@article {1260, title = {Prebiotic Activity of Polysaccharides Extracted from Jerusalem Artichoke Tuber and Development of Prebiotic Granules}, journal = {Pharmacognosy Journal}, volume = {12}, year = {2020}, month = {Research Article}, pages = {1402-1411}, type = {Research Article}, chapter = {1402}, abstract = {

Introduction: Jerusalem artichoke tubers (JA) contain non-digestible carbohydrates, especially inulin-type fructans, which have been found to possess various benefits on human health, including the prebiotic effect. Although many studies established the prebiotic property of inulin or fructo-oligosaccharides, there are less information of the prebiotic potential of JA crude extract. This study aimed to investigate prebiotic effect of the JA extract and develop prebiotic granules from JA extract. Material and Methods: Crude polysaccharide extract of JA was obtained using hot water and freeze-dried method. The selected probiotics, including L. plantarum, L. acidophilus, B. longum and B. breve were used in this study. The prebiotic effect of the JA extract was indicated by bacterial growth and acid production. Parallelly, JA extract granule formulation was developed to be a prebiotic food product. Results: The JA extract at the highest concentration tested (2\%) caused a significant increase in the growth and acid production of every probiotics tested, including L. plantarum, L. acidophilus, B. longum and B. breve. The growth promoting effects of the 2\% JA extract were detected as early as 12 hour-incubation, and this action was maintained throughout the observed incubation period. Conclusions: The developed JA extract granules possessed desirable properties with the moisture content of 4.00{\textpm}0.20\%. The formulated granule was soluble in water and produced a brown and clear solution with slightly sweet taste. Nonetheless, in vivo experiments on the prebiotic effect of the developed preparation should be performed further.

}, keywords = {Granule, Helianthus tuberosus, Jerusalem artichoke, Prebiotic effect, Probiotics}, doi = {10.5530/pj.2020.12.194}, author = {Sakulrat Rattanakiat and Pawitra Pulbutr and Wanwisa Khunawattanakul and Bunleu Sungthong and Kritsanee Saramunee} } @article {772, title = {Inhibitory Actions of Lagerstroemia speciosa (L.) Pers. Aqueous and Ethanolic Leaf Extracts against Carbohydrate-digesting Enzymes}, journal = {Pharmacognosy Journal}, volume = {10}, year = {2018}, month = {November 2018}, pages = {s113-s118}, type = {Original Article}, chapter = {s113}, abstract = {

Context: The leaves of Lagerstroemia speciosa (L.) Pers. (banaba) have been consumed traditionally in several Southeast Asian countries for the treatment of diabetes mellitus. The plasma glucose lowering actions of this medicinal plant were proposed to be linked with several mechanisms of action. However, its inhibitory actions against \α-amylase and \α-glucosidase, which play a major role in the regulation of postprandial plasma glucose, have not been clearly established. Aims: This study thus aimed to investigate the effects of Lagerstroemia speciosa (L.) Pers. aqueous and ethanolic leaf extracts (LSA and LSE extracts, respectively) on in vitro carbohydrate-digesting enzyme activities and enzyme kinetics. Settings and Design: In vitro carbohydrate-digesting enzyme activity assay. Materials and Methods: The activities of \α-amylase and \α-glucosidase were indicated by the amounts of maltose and p-nitrophenol generated in the reactions, respectively. Statistical analysis used: The data were analysed by using one-way ANOVA, followed by Bonferroni post-hoc test. Results: The LSA extract significantly inhibited both \α-amylase and \α-glucosidase enzymes with the IC50s of 1.21\±0.16 and 49.71\±0.86 \μg/mL, respectively. Meanwhile, the LSE extract selectively inhibited \α-amylase activity (IC50 = 22.21\±4.00 \μg/mL) with no apparent inhibition against \α-glucosidase activity. Both LSA and LSE extracts inhibited \α-amylase enzyme in a mixed inhibition manner whilst the LSA extract also acted as a mixed inhibitor against \α-glucosidase enzyme. The extracts possessed higher binding affinities toward the enzymes, indicated by the lower Ki values, when compared to acarbose (positive control). Conclusion: These results suggest the potential use of the extracts for a control of postprandial plasma glucose.

}, keywords = {Diabetes mellitus, Lagerstroemia speciosa (L.) Pers., α-amylase, α-glucosidase}, doi = {10.5530/pj.2018.6s.22}, author = {Wanwisa Khunawattanakul and Passakorn Boonma and Ronnarit Kampetch and Achida Jaruchotikamol and Benjamart Cushnie and Sakulrat Rattanakiat and Pawitra Pulbutr} }