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Osamu Shirota

Explore the profile of Osamu Shirota including associated specialties, affiliations and a list of published articles. Areas
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Articles 65
Citations 282
Followers 0
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Recent Articles
1.
Yagoo A, Milton M, Vilvest J, Ahino Jessie A, Shirota O, Balakrishna K
Toxicon . 2024 Dec; 253:108200. PMID: 39644978
Mosquitoes, as hematophagous ectoparasites, are significant pests and vectors of numerous pathogens, causing diseases such as dengue, lymphatic filariasis, malaria, chikungunya, and Japanese encephalitis in India. This study investigates the...
2.
Warashina T, Shirota O, Okamoto Y
Chem Pharm Bull (Tokyo) . 2024 Oct; 72(10):917-922. PMID: 39462549
The MeOH extract from dried immature fruits of Euonymus sieboldianus (Celastraceae) plants yielded nineteen new β-dihydroagarofuran-type sesquiterpene polyesters. The structures of these compounds were established using NMR, MS spectroscopic analysis...
3.
Yamada S, Warashina T, Shirota O, Kato Y, Fukuda T
Biomolecules . 2024 Oct; 14(10). PMID: 39456179
Petit vert (scientific name: var. DC. × var. DC.) is a new variety of vegetable created by crossbreeding kale and brussel sprouts species). The present study aimed to identify biologically...
4.
Warashina T, Shirota O, Ohara K
Chem Pharm Bull (Tokyo) . 2023 Sep; 71(9):734-740. PMID: 37661379
The MeOH extract from dried roots of Oxypetalum caeruleum (Apocynaceae, formerly known as Asclepiadaceae) plants yielded twenty new pregnane glycosides, some of which had a new 12,20-epoxy type aglycone. The...
5.
Warashina T, Shirota O, Ohara K
Chem Pharm Bull (Tokyo) . 2022 Jul; 70(8):580-588. PMID: 35908924
The MeOH extract from dried roots of Oxypetalum caeruleum (Apocynaceae) plants yielded seventeen new pregnane glycosides, some of which had the acylated-ramanone or -isoramanone type aglycone. The structures of these...
6.
Nugroho A, Tange M, Kusakabe S, Hirasawa Y, Shirota O, Matsuno M, et al.
J Nat Med . 2022 May; 76(4):756-764. PMID: 35511335
Bioactivity guided separation of Chukrasia velutina root methanolic extract led to the isolation of nine new isopimarane diterpenoids, chukranoids A-I (1-9). The absolute configuration was then assigned by comparing the...
7.
Louis M, Rani V, Krishnan P, Reegan A, Balakrishna K, Ignacimuthu S, et al.
Appl Biochem Biotechnol . 2022 Feb; 195(4):2636-2647. PMID: 35201599
Mosquitoes are important vectors responsible for spreading a number of diseases affecting both humans and animals. Many diseases as dengue, chikungunya, yellow fever, malaria, filariasis and Japanese encephalitis are spread...
8.
Nugroho A, Nakajima S, Wong C, Hirasawa Y, Kaneda T, Shirota O, et al.
J Nat Med . 2021 Aug; 76(1):94-101. PMID: 34351584
Eight new limonoids, walsogynes H-O (1-8) were isolated from the barks of Walsura chrysogyne, and their structures were determined on the basis of the 1D and 2D NMR data. Walsogynes...
9.
Warashina T, Shirota O
Chem Pharm Bull (Tokyo) . 2021 Feb; 69(2):226-231. PMID: 33518605
The MeOH extract from dried aerial parts of Oxypetalum caeruleum (Apocynaceae) plants yielded seventeen compounds, including four new tetracyclic triterpenoids, one pregnane glycoside, two lignane glycosides, and ten known compounds....
10.
Nugroho A, Hirasawa Y, Kaneda T, Shirota O, Matsuno M, Mizukami H, et al.
J Nat Med . 2021 Jan; 75(2):415-422. PMID: 33481181
Bioactivity guided separation of Walsura trichostemon stem methanolic extract led to the isolation of four new dammarane (1-4) and two new apotirucallane triterpenoids (5-6), together with one limonoid (7), 11,25-dideacetyltrichostemonate,...