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Open AccessArticle

Methyl Ether-Derivatized Sterols and Coprostanol Produced via Thermochemolysis Using Tetramethylammonium Hydroxide (TMAH)

1
Department of Science and Technology, Soka University, 1-236 Tangi-machi, Hachioji City, Tokyo 192-8577, Japan
2
Department of Environmental Engineering for Symbiosis, Graduate School of Engineering, Soka University, 1-236 Tangicho, Hachioji, Tokyo 192-8577, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Yasunori Yaoita
Molecules 2019, 24(22), 4040; https://doi.org/10.3390/molecules24224040
Received: 7 October 2019 / Revised: 31 October 2019 / Accepted: 5 November 2019 / Published: 7 November 2019
(This article belongs to the Special Issue Natural Sterols)
Sterols are widely distributed in nature from lipids in organisms to sediments. As a conventional method, extraction and derivatization with TMS have been applied for sterol analysis, requiring a long preparation time for gas chromatography–mass spectrometry analysis. In this study, for sterol analysis, thermochemolysis using tetramethylammonium hydroxide (TMAH) was applied. This method performs hydrolysis and methylation simultaneously; thus, free and ether-bonding sterols can be analyzed as sterol methyl ethers in a relatively short time period. A sediment sample from a tideland (the Yatsu tideland, Japan) was analyzed using the TMAH method, and we detected more than 10 sterols, which include cholest-5-en-3β-ol (cholesterol), 24-ethylcholest-5-en-3β-ol (sitosterol), 24-methylcholesta-5,22E-3β-ol (brassicasterol), 24-ethylcholesta-5,24(28)Z-dien-3β-ol (isofucosterol), 4α,23,24-trimethyl-5α(H)-cholest-22E-en-3β- ol (dinosterol), and 5β(H)-cholestan-3β-ol (coprostanol). The detection of the various sterols can be attributed to multiple natural and artificial sources around the Yatsu tideland. In this paper, the mass spectra of these sterols are provided together with an interpretation of their fragmentation patterns. Additionally, the fecal pollution in the Yatsu tideland is discussed in the context of the detection of coprostanol. View Full-Text
Keywords: thermochemolysis; tetramethylammonium hydroxide (TMAH); sterols; coprostanol thermochemolysis; tetramethylammonium hydroxide (TMAH); sterols; coprostanol
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Nakakuni, M.; Yamasaki, Y.; Yoshitake, N.; Takehara, K.; Yamamoto, S. Methyl Ether-Derivatized Sterols and Coprostanol Produced via Thermochemolysis Using Tetramethylammonium Hydroxide (TMAH). Molecules 2019, 24, 4040.

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