Isoastilbin 是Rhizoma Smilacis glabrae和Astragalus membranaceus中的二氢黄酮醇糖苷。它抑制酪氨酸酶活性，还抑制葡萄糖基转移酶，IC50值为 54.3 μg/mL。它具有神经保护、抗氧化、抗微生物和抗凋亡活性，可研究阿尔茨海默氏病。

Isoastilbin is a dihydroflavonol glycoside compound in Rhizoma Smilacis glabrae and Astragalus membranaceus. Isoastilbin inhibits glucosyltransferase (GTase) with an IC50 value of 54.3 μg/mL, Isoastilbin has anti-acne and tyrosinase inhibition properties. Isoastilbin shows neuroprotective, antioxidation, antimicrobial and anti-apoptotic properties and has the potential for Alzheimer s disease research

The crude extracts were assayed for antimicrobial activities against Streptococcus sobrinus and for glucosyltransferase (GTase) inhibition. Fourteen extracts inhibited the growth of S. sobrinus by more than 50% and six extracts inhibited GTase activity by more than 50% at a concentration of 100 μg/ml. Koompassia malaccensis (kempas) extracts showed 90% depression of S. sobrinus growth and 80% inhibition of GTase activity at a concentration of 100 μg/ml. Kempas crude extracts were subjected to column chromatography using Sephadex LH-20 and then preparative high-performance liquid chromatography to isolate four compounds A, B, C, and D. These compounds were identified as taxifolin and the flavanonol rhamnoside isomers neoastilbin, astilbin, and Isoastilbin, respectively, from 1H and 13C nuclear magnetic resonance (NMR) spectra and other two-dimensional NMR techniques (COSY, HMBC, and HMQC). Each compound depressed the growth of S. sobrinus over a concentration range of 9.3242.7 μg/ml and showed GTase inhibitory activity with IC50 values in the range 27.4-57.3 μg/ml[1]

54081-48-0

C21H22O11

450.39

DMSO:10 mM
Powder: -20°C for 3 years
In solvent: -80°C for 2 years