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KMID : 0380620160480040361
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Korean Journal of Food Science and Technology
2016 Volume.48 No. 4 p.361 ~ p.365
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Isolation and identification of a tricin 4"-O-(threo-β-guaiacylglyceryl) ether producing microorganism from germinated rice
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Yoon Na-ra
Jang Gwi-Yeong
Lee Yoon-Jeong
Li Meishan
Kim Min-Young
Kim Hyun-Young
Lee Jun-Soo
Jeong Heon-Sang
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Abstract
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This study was conducted to isolate and identify a microorganism that increases tricin-O-(threo-β-guaiacylglyceryl) ether (TTGE) content in the hulls of rice (Oryza sativa L.). Bacteria from germinated rice were isolated by enrichment cultivation using yeast mold, luria bertani, potato dextrose and mannitol egg york polymyxin broths. The highest increase in TTGE content (339.30 μg/g) was achieved by a microorganism isolated by PDA enrichment cultivation. On the basis of 16S RNA sequence homology and phylogenetic analysis, the isolated bacterium was identified to have 100% similarity with Burkholderia vietnamiensis. The isolated bacteria were short rods, negative for the Gram stain, and positive for the catalase test. The highest TTGE level was 435.86 μg/g in 72-h fermented samples, representing a 2.5x increase compared with the control (175.65 μg/g). In conclusion, the bacterium isolated from germinated rice extract was Burkholderia vietnamiensis, and the optimum fermentation period to maximize TTGE levels was 72 h. These findings might help in developing functional materials using rice hulls, a waste product of rice milling.
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KEYWORD
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rice hull, tricin 4'-O-(threo-β-guaiacylglyceryl) ether, Burkholderia vietnamiensis, isolation, identification.
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