Analytical Sciences

Mass Spectrometric Quantification of Amphipathic, Polyphenolic Antioxidant of the Pacific Oyster (Crassostrea Gigas)

Hiroaki OKABE,* Shu-Ping HUI,* Hirotoshi FUDA,* Takayuki FURUKAWA,* Seiji TAKEDA,* Rojeet SHRESTHA,* Yusuke MIURA,* Mitsugu WATANABE,** and Hitoshi CHIBA*

*Faculty of Health Sciences, Hokkaido University, Kita-12, Nishi-5, Sapporo 060-0812, Japan
**Watanabe Oyster Laboratory Co., Ltd., 490-3 Shimoongata-cho, Hachioji, Tokyo 192-0154, Japan

A novel amphipathic phenolic compound, 3,5-dihydroxy-4-methoxybenzyl alcohol (DHMBA), that can be isolated from the Pacific oyster (Crassostrea gigas) has been found to protect human hepatocytes against oxidative stress. This study aims to establish a method for the measurement of DHMBA for industrial application. Liquid chromatography–tandem mass spectrometry using deuterated DHMBA as an internal standard and a polar end-capped ODS (Hypersil GOLD aQ) as the solid phase was validated. The limit of detection was 0.04 pmol (S/N = 5), and the limit of quantitation was 0.1 pmol (S/N = 10). The calibration curve was linear throughout the range of 0.1 – 16 pmol (r² = 0.9995). This method successfully quantified DHMBA in oysters from 11 sea areas in Japan. The results showed that the yield of DHMBA was variable from 9.8 to 58.8 μg g⁻¹ whole oyster meat wet weight but not affected by the seawater temperature. The proposed LC-MS/MS method is useful in quantitative studies for DHMBA and potentially for other amphipathic substances.

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