title: Removal of off-flavors from sea tangle (Laminaria japonica) extract by fermentation with Aspergillus oryzae.
abstract: This study was conducted to reduce off-flavors from sea tangle (Laminaria japonica) extract since the typical odor of seaweed is an impediment to consumption of seaweed products. Fifty-six odor compounds emitted from the extract were identified using a thermal desorbor and gas chromatography-mass spectrometry. On the basis of expected odor intensity (EOI), isovaleric acid (41.2%), allyl isothiocyanate (22.6%), octanal (11.1%) and acetaldehyde (10.6%) were responsible for about 85.5% of total odor strength in the extract, suggesting that the odor of the extract might mainly be attributed to these compounds. The EOIs of odor compounds were dramatically reduced or disappeared during fermentation by Aspergillus oryzae. Total EOI of the odor compounds decreased about four-fold, compared with that of the raw extract (control) after the four days of fermentation at 30°C with agitation at 120 rpm. These results indicate that microbial fermentation may be a good strategy to reduce off-flavors of seaweeds.
authors: Cooperative Laboratory Center, Pukyong National University, Busan 608-737, Republic of Korea.
authors: Yong-Soo
authors: YS
authors: Seo
authors: Hyang-Nam
authors: HN
authors: Bae
authors: Sung-Hwan
authors: SH
authors: Eom
authors: Keun-Sick
authors: KS
authors: Lim
authors: In-Hye
authors: IH
authors: Yun
authors: Yong-Hyun
authors: YH
authors: Chung
authors: Jeong-Min
authors: JM
authors: Jeon
authors: Hyun-Woo
authors: HW
authors: Kim
authors: Myung-Suk
authors: MS
authors: Lee
authors: Yang-Bong
authors: YB
authors: Lee
authors: Young-Mog
authors: YM
authors: Kim
mesh_terms: D000079:Acetaldehyde / Q000032:analysis; D000447:Aldehydes / Q000032:analysis; D001236:Aspergillus oryzae / Q000378:metabolism*; D005285:Fermentation; D063427:Food Quality; D008401:Gas Chromatography-Mass Spectrometry; D045782:Hemiterpenes; D017879:Isothiocyanates / Q000032:analysis; D007795:Laminaria / Q000737:chemistry*; D009812:Odorants / Q000032:analysis / Q000517:prevention & control*; D010421:Pentanoic Acids / Q000032:analysis; D010936:Plant Extracts / Q000032:analysis / Q000737:chemistry*; D012624:Seaweed / Q000737:chemistry*
chemical_list: D000447:Aldehydes; D045782:Hemiterpenes; D017879:Isothiocyanates; D010421:Pentanoic Acids; D010936:Plant Extracts; C008216:isovaleric acid; C004471:allyl isothiocyanate; D000079:Acetaldehyde; C031639:caprylic aldehyde