미강에 함유된 약리성분인 γ-oryzanol 함량을 검정하여 용도 다양화 연구의 기초 자료를 제공코자 시험을 수행한 바 다음과 같은 결과를 얻었다. Soxhlet 추출장치에서 얻은 미강유에서 유리 sterol과 ferulic acid ester가 분리되었다. 유리 sterol은 GC-MS에 의하여 campesterol, β-sitosterol 및 stigmasterol로 구성되어 있음을 알 수 있었다. ferulic acid ester는 알칼리 가수분해에 의하여 얻어지는 검화분해물을 분리용 TLC로 분리하여 triterpene과 sterol을 얻었다. sterol은 GC-MS 측정으로 유리 sterol과 같은 조성임을 알았으며 triterpene은 cycloartanol, cycloartenol, 24-methylenecycloartanol 및 미지의 triterpene로 구성되었다. 미강유나 pitch 중 ferulic acid ester의 흡광도를 기준으로 γ-oryzanol의 함량을 평가한다면 큰 오차는 없으리라 생각된다.

Phytochemical analysis on rice bran and its pitch was performed by the tool of TLC, UV- and IR-spetroscopy, so that it was found that they contained γ-oryzanol and free sterol. GC-MS analysis of free sterol revealed that it was composed of β-sitosterol, campesterol and stigmasterol. Successive phytochemical analysis of γ-oryzanol revealed that it was composed of ferulic acid ester of triterpene and sterol, respectively. Triterpene moieties of γ-oryzanol were identified as follows: cycloartanol, cycloartenol, 24-methylenecycloartanol and unknown triterpene; And sterol moieties were found to be identical with free sterols. In addition, characteristic absorption band in UV spectrum (220-340 nm) was exclusively due to γ-oryzanol. Thus, it was suggested that rice brans of nearly all species of Oryza sativa can be quantitatively analyzed by UV absorption spectrometry, even when water soluble pigments was contained in the rice bran.

• 곽태순 | Kwak, Tae-Soon
• 박희준 | Park, Hee-Juhn