江西产腐乳生物胺水平调查及产胺菌的分离与鉴定

Investigation of the Biogenic Amine Content in Jiangxi-made Sufu and Isolation and Identification of Amine-producing Bacteria

采用高效液相色谱法对江西产腐乳生物胺含量水平进行调查分析,通过微生物学分离结合高效液相色谱确认,筛选出生物胺产生菌,并对其进行鉴定。结果表明,12种腐乳样品中总生物胺含量范围为68.5~1084.0 mg/kg,色胺、腐胺、组胺和酪胺是主要生物胺,其中腐胺和酪胺的含量较高。筛选出的9株产胺菌产生物胺的含量范围为93.8~369.2 mg/L。对产胺量较高的6株菌进行表型鉴定和基因型16S rDNA序列测定,得到耐热芽孢杆菌(Bacillus sporothermodurans) 1株,鲁梅利杆菌(Rummeliibacillus stabekisii) 1株,耐硼赖氨酸芽孢杆菌(Lysinacillus boronitolerans)3株和皮脂葡萄球菌(Staphylococcus piscifermentans)1株。研究结果对腐乳食用安全性评价提供了理论依据,为进一步探清如何抑制腐乳中产胺菌的活性提供了理论研究基础。

The biogenic amine Level in Jiangxi-made sufu was analyzed by high performance liquid chromatography(HPLC) and amine-producing bacteria were isolated and identified by microbiological methods combined with HPLC confirmation. The results showed that total biogenic amine level ranged from 68.5 to 1084.0 mg/kg in sufu samples. Major biogenic amines were tryptamine, putrescine, histamine and tyramine, among which putrescine and tyramine were of the highest level. Biogenic amine level produced by 9 amine-producing bacteria ranged from 93.8 to 369.2 mg/L. For six bacteria with relatively high amine productivity, phenotype and genotype 16S rDNA sequence determination had found one Bacillus sporothermodurans strain, one Rummeliibacillus stabekisii strain, three Lysinacillus boronitolerans strains and one Staphylococcus piscifermentans strain. The current research offered theoretical evidence for edible safety evaluation of sufu and served as research basis to investigate how to inhibit activity of amine-producing bacteria in sufu.