• 한국수산과학회지
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• 제49권6호
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• pp.792-799
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• 2016

We isolated seven tryptamine-producing bacteria from commercial salted and fermented sand lance (Ammodytes personatus) sauces using an L-tryptophan decarboxylating medium. These tryptamine-producing bacteria, identified using an API kit and 16S rRNA analysis, included Lysinibacillus xylanilyticus (one strain), Lysinibacillus fusiformis (four strains), and Staphylococcus epidermidis (two strains). Lysinibacillus spp. produced the highest levels of tryptamine in culture broth containing 0.5% L-tryptophan, compared with 1.0% and 2.0% preparations. After 72 h of incubation, Staphylococcus epidermidis produced the highest levels of tryptamine ($60.50{\mu}g/mL$ and $664.86{\mu}g/mL$) in culture broth containing 2.0% L-tryptophan. While Lysinibacillus spp. comprised the dominant tryptamine-producing bacteria in sand lance sauces, Staphylococcus epidermidis also showed high tryptamine-producing activity. This is the first report on the isolation and identification of tryptamine-producing bacteria in sand lance sauces.

• 생명과학회지
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• 제19권2호
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• pp.277-283
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• 2009

Biogenic amines은 발효제품과 같이 어류 속의 미생물에서 분비된 decarboxylase의 free amino acid의 decarboxylation에 의해 형성된다. 본 연구는 국내 어분 제조원료로 이용되고 있는 참치 부산물의 항영양인자로 작용하는 biogenic amines (histamine, tyramine, tryptamine, putrescine, cadaverine)의 분해조절을 위해 참치 부산물의 특성 구명을 위한 연구로 실시하였다. 참치 부산물의 pH 및 염도 농도는 6.51과 3.35%이었으며, 참치 어분의 pH 및 염도 농도는 5.58과 5.83% 이었다. 참치 부산물 내 존재하고 있는 균주 및 주요 미생물을 확인한 결과 Total bacteria, aerobic plate count (APC), Total coliform (TC), Lactobacillus spp. 및 Bacillus spp.는 각각 9.20, 9.29, 5.67, 7.82 및 7.58(Log CFU/g)이었다. 참치 부산물 내 히스타민 주요 생성균을 확인하기 위해 TLC 방법을 이용하였으며 히스타민 선택배지에서 추출한 미생물 중 총 7종의 히스타민 생성 균주를 선발하였다. 선발된 균주는 HPLC 분석을 통하여 히스타민 농도를 측정하여 아민 생성 미생물을 재확인하였다. Trypicase soy broth에 1% L-histidine (TSBH)을 첨가한 배지에서 분리한 7종의 히스타민 생성 균주를 16SrRNA 염기서열 분석 방법을 통해 분석한 결과, 참치 부산물내 주요 우점 아민 생성 미생물은 L. lactis subsp. lactis, K.pneummonlae, L. garvieae, V. olivaceus, H. alvei, L. garvieae 및 Morganella morganii가 주요 균주로 분석되었다. 16S rRNA 분석결과로 만들어진 phylogenetic tree는 다른 계통임을 보여주며 이는 biogenic amine을 생성하는 그람 양성 및 음성균으로 분류될 수 있다.

• Asian-Australasian Journal of Animal Sciences
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• 제15권11호
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• pp.1646-1652
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• 2002

Si-Raw is a raw cured meat (raw, cured meat fermented with steamed rice) produced by the aboriginal people of Taiwan. In order to prevent food poisoning or intoxication from botulism, new methods of monitoring the production base on hurdle technology were investigated. New methods investigated incorporated citric acid, sodium hypophosphite, Monascus anka mash, plum paste or lactic acid bacteria inoculum added separately to meat with steamed rice and salt to lower the Aw (water activity) and pH values of the products to control the microbial growth. Results showed that anaerobic bacterial counts, lactic acid bacterial counts and aerobic bacterial counts for the products of all treatments were less than $10^6$, $10^5$ and $10^2cfu/g$, respectively. Sodium chloride content of all products was above 5.46%, water activity was below 0.939 and pH value was below 4.27. IMP was lower and ATP and hypoxanthine were higher. ATP concentrations were higher in the samples which contained the anka mash. Result of sensory panel test indicated that most people preferred the products with added sodium hypophosphite. Except for the fact that the content of tryptamine in the sample with Monascus anka mash was higher, the amine concentrations for all treatments were lower than those of other fermented meat products. The amino acid nitrogen content was higher in the product made from raw meat treated with citric acid, but lower in the other products. Neither Clostridium botulinum nor Trichinella spiralis were detected in any of the treatments. The result may indicate that hurdle technology is effective for hygiene and safe producing Si-Raw.