@article{Miyata_Sahlan_Ishikawa_Hashimoto_Honda_Kumazawa_2020, title={Propolis Components and Biological Activities from Stingless Bees Collected on South Sulawesi, Indonesia}, volume={27}, url={https://journal.ipb.ac.id/index.php/hayati/article/view/30313}, DOI={10.4308/hjb.27.1.82}, abstractNote={<p>Three new compounds, namely sulabiroins A (1) and B (2), and 2’,3’-dihydro-3’-hydroxypapuanic acid (3), were isolated from the propolis of stingless bees (<em>Tetragonula</em> aff. <em>biroi</em>) collected on South Sulawesi, Indonesia. In addition, ten known compounds, (–)-papuanic acid (4), (–)-isocalolongic acid (5), isopapuanic acid (6), isocalopolyanic acid (7), glyasperin A (8), broussoflavonol F (9), (2S)-5,7-dihydroxy-4’-methoxy-8-prenylflavanone (10), isorhamnetin (11), (1’S)-2-<em>trans</em>,4-<em>trans</em>-abscisic acid (12), and (1’S)-2-<em>cis</em>,4-<em>trans</em>-abscisic acid (13) were identified. The structures of the new and known compounds were determined by spectroscopic analysis. The absolute configurations of sulabiroins A (1) and B (2) were determined by X-ray crystallography analysis and ECD calculation, respectively. The propolis from stingless bee (<em>Tetragonula</em> aff. <em>biroi</em>) collected on South Sulawesi contained compounds not present in propolis from other regions. Sulabiroin A (1) and isorhamnetin (11) were examined for xanthine oxidase (XO) inhibitory activity as one of biological activities; isorhamnetin (11) exhibited potent XO inhibitory activity, with an IC<sub>50</sub> value of 3.9 µm.</p&gt;}, number={1}, journal={HAYATI Journal of Biosciences}, author={MiyataRyo and SahlanMuhamad and IshikawaYoshinobu and HashimotoHiroshi and HondaSari and KumazawaShigenori}, year={2020}, month={Jan.}, pages={82} }