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1.
Sunisa Boontom Kanokthorn Boonkitpatarakul Mongkol Sukwattanasinitt Nakorn Niamnont 《Tetrahedron》2017,73(17):2483-2487
A novel thiosemicarbazone fluorophore (3) was successfully synthesized in 3 steps via Sonogashira coupling and Knoevenagel condensation using baker's yeast (Saccharomyces cerevisiae) as a biocatalyst. Compound 3 contains triphenylacetylene, which acts as a fluorophore, and thiosemicarbazone, which acts as a copper probe. Compound 3 exhibited highly selective detection of Cu2+ ions based on photoinduced electron transfer (PET) in 10 mM HEPES buffer pH 7.4/propylene glycol (70% (v/v)). A linear relationship was observed for Cu2+ concentrations between 0.1 nM and 10 μM, and the detection limit of the method was 0.14 nM. Additionally, 3 was utilized to detect Cu2+ in wastewater with satisfactory results, which highlighted its potential for real sample applications. 相似文献
2.
Sunisa Suwancharoen Orawan Chonvanich Sophon Roengsumran Surachai Pornpakakul 《Chemistry of Natural Compounds》2012,48(4):583-586
A new seco-kaurane type diterpenoid, ent-3,4-seco-17-oxo-kaur-4(19),15(16)-dien-3-oic acid, and a known compound, ent-3,4-seco-kaur-4(19),16(17)-dien-3-oic acid, were isolated from the stem bark of Croton oblongifolius. The structures of these compounds were established on the basis of spectroscopic data. 相似文献
3.
Chotsuwan Chuleekorn Boonrungsiman Suwimon Chokanarojwong Thitiporn Dongbang Sunisa 《Journal of Solid State Electrochemistry》2017,21(10):3011-3019
Journal of Solid State Electrochemistry - A novel mesoporous soft solid electrolyte was successfully prepared from tetrabutylammonium hexafluorophosphate, propylene carbonate, and... 相似文献
4.
Sunisa Jindasuwan Pornapa Sujaridworakun Supatra Jinawath Sitthisuntorn Supothina 《Macromolecular Symposia》2008,264(1):90-94
Hydrophobic thin films of polydimethylsiloxane (PDMS) - titamium (hydrous) oxide hybrid material were deposited on glass substrate by dip coating from the precursor containing hydroxyl-terminated PDMS and titanium tetraisopropoxide (TIP), as well as small amounts of water and ethyl acetoacetate. Film's hydrophobicity was evaluated by performing contact angle measurement, while surface topography was analyzed by using an atomic force microscope (AFM). Effects of heat treatment temperature and TIP:PDMS ratio on film's hydrophobicity are described. 相似文献
5.
Nuntaporn Moonrungsee Nipat Peamaroon Apaporn Boonmee Sunisa Suwancharoen Jaroon Jakmunee 《Chemical Papers》2018,72(11):2729-2736
A simple toolbox was developed for the evaluation of tyrosinase inhibitory activity in Salak (Salacca zalacca) extracts by the colorimetric measurement based on a photograph taken by a digital camera or a smartphone camera. The reaction of 3,4-dihydroxyphenylalanine (l-DOPA) and tyrosinase was employed to form the dopaquinone dye, which decreases with the increase of the tyrosinase inhibitor. Under the optimum conditions, the Salak extracts were examined for the tyrosinase inhibitory activity. The captured picture of dopaquinone dye product was analyzed by reading blue color intensity using an Adobe Photoshop CS6 program. The tyrosinase inhibition of the extracts was calculated from the blue color intensity, and expressed as %inhibition and IC50 values. The obtained results from the developed method correlated well with those obtained from the microplate reader instrument. The achievement of this research will be a guideline for creating any simple analytical instrument based on colorimetry. In addition, the information on tyrosinase inhibitory activity of the Salak extracts is useful for the application of this fruit to produce the supplement food and the cosmetic in the future. 相似文献
6.
Surachai Pornpakakul Sophon Roengsumran Amorn Petsom Nattaya Ngamrojnavanich Narongsak Chaichit 《Tetrahedron letters》2007,48(4):651-655
A novel CYP3A4 inhibitor, diaporthichalasin, together with pycnidione were isolated from an endophytic fungus, Diaporthe sp. Their structures were elucidated on the basis of spectral data and the structure of diaporthichalasin was confirmed by X-ray crystallographic analysis. Diaporthichalasin exhibited significantly potent inhibition of CYP3A4 with an IC50 value of 0.626 μM, while the IC50 value of pycnidione was 465 μM. 相似文献
7.
Jatupol LiangsakulSurachai Pornpakakul Ek SangvichienNongnuj Muangsin Prakitsin Sihanonth 《Tetrahedron letters》2011,52(48):6427-6430
Two new compounds, emervaridione and varioxiranediol, together with the three known compounds, stellatic acid, ergosterol and dihydroterrein, were isolated from the endophytic fungus, Emericella variecolor. The structures of emervaridione and varioxiranediol were established from spectroscopic and X-ray crystallographic analysis. 相似文献
8.
Using ozonolysis of the acid-catalyzed cyclized products of (−)-nidorellol and air-autoxidation as the key steps, (+)-ambrox was obtained in 53% overall yield. In the course of our synthesis, we discovered that (−)-nidorellol provided (+)-ambrox instead of the expected product, (−)-ambrox. Thus the absolute configuration of (−)-nidorellol was proved to be trans-(5R∗,7R∗,8R∗,9S∗,10R∗)-labda-12,14-diene-7α,8β-diol, which is opposite to that illustrated in a previous report. 相似文献
9.
Punlop Kuntiyong Sunisa AkkarasamiyoNuanpan Piboonsrinakara Chitlada HemmaraPoramate Songthammawat 《Tetrahedron》2011,67(41):8034-8040
A formal synthesis of schulzeines B and C, marine natural products with inhibitory effect against α-glucosidase, has been achieved. The key reactions of the synthesis are N-acyliminium ion cyclization, Sharpless asymmetric dihydroxylation, olefin cross metathesis, and asymmetric allylboration. 相似文献
10.
Sunisa Akkarasamiyo Joseph S. M. Samec 《Angewandte Chemie (International ed. in English)》2019,58(50):17908-17910
The stereospecific substitution of non‐derivatized and non‐allylic enantioenriched alcohols with only water as a by‐product would enable the use of readily available alcohols as substrates for green and sustainable transformations. However, the poor leaving group ability of the OH group has hampered the development of such a process. Denton and co‐workers recently described the use of (2‐hydroxybenzyl)diphenylphosphine oxide as a catalyst of a redox‐neutral and zero‐waste‐generating Mitsunobu reaction. This innovative process constitutes the first intermolecular stereospecific substitution of non‐allylic alcohols, and might find industrial applications. 相似文献