Rep. Nat l Food Res. Inst No 報 文 3M TM Molecular Detection System を用いた Listeria monocytogenes の 簡易迅速遺伝子検査法の評価 Evaluation of 3M Molecular Detection System for detecting Listeria monocytogenes from food samples Susumu KAWASAKI 1 Mari Mochida 1, Mie Saito 1, and Takatoshi Moriyama 2 1 National Food Research Institute, 2-1-12 Kannondai, Tsukuba, Ibaraki 305-8642, Japan 2 3M Health Care Limited, 33-1, Tamagawadai 2-chome Setagaya-ku, Tokyo 158-8583, Japan Abstract The culture methods (ISO 11202-1) were compared to 3M Molecular detection system (MDS) for Listeria monocytogenes from enrichment cultures of various types of artificially inoculated ready to eat (RTE) foods. The MDS assay was evaluated in 12 types of spiked samples, including meat, fish, sprouts, and dairy products for L. monocytogenes. The MDS assay also evaluated in inoculate ground beef samples. Beef samples contamination levels is 0.66 most probable number (MPN)/g were used for recovery study. Twenty test portions (5g) of the contaminated beef were pre-enriched, and MDS assay and the culture method (ISO 11290-1) was used thereafter. An excellent agreement was obtained for the results of MDS assay and culture method, which suggests that the MDS assay is a reliable and useful method for rapid screening of L. monocytogenes contamination. Keywords: 3M Molecular detection system, L. monocytogenes, rapid detection, foodborne pathogens Corresponding author skawasa@affrc.go.jp
緒言 Listeria monocytogenes ready-to-eat L. monocytogenes ISO - FDA/BAM L. monocytogenes Real-Time PCR DNA PCR SYBR Green ds-dna PCR LAMP Molecular Detection System MDS LAMP ATP MDS - ATP ATP LAMP MDS L. mocytogenes Listeria Ready-to-eat M MDS L monocytogenes Readyto-eat 図 1.MDS 法を用いた遺伝子増幅産物の検出原理
M MDS L MDS MDS 実験材料および方法 1. 供試菌および供試食材と接種菌数の確認 L. monocytogenes ATCC Trypticase Soy Broth TSB Difco. % Yeast extract TSBYE, Ready-to-eat L. monocytogenes Tripticase Soy Agar TSA; Difco. % Yeast extract TSAYE L. monocytogenes 2. 牛挽肉からのL. monocytogenes 検出感度試験 L. monocytogenes Fraser M Fraser Fraser ml g Fraser ml Fraser ml L. monocytogenes Fraser Fraser CFU/mL CFU/mL 3.Ready-to-eat 食品からの MDS による検出評価試験 L. moncytogenes CFU/mL. ml g ISO - MDS ISO - Demi-Fraser L Fraser L MDS MDS ISO - MDS 4. 低濃度接種区における検出感度試験と前培養培地間比較試験 g L. moncytogenes CFU/mL ml g ml ml TSBYE L. moncytogenes L. moncytogenes 表 1.L. monocytogenes の接種試験による MDS 法の食材適合試験結果. Demi-Fraser Fraser ISO- - MDS ISO- - MDS
図 2.MDS と培養法での L. monocytogenes 検出比較実験のスキーム g TSBYE Demi-Fraser ml ml - MDS L. moncytogenes TSBYE Demi-Fraser. ml ml Fraser L. moncytogenes ml Fraser 5. 培養法と抗体キットによるL. monocytogenes の検出と確認 L. monocytogenes ALOA L PBS L SiglePath L mono (Merck) L. monocytogenes L SiglePath L mono L. monocytogenes 6.MDS による核酸抽出法および遺伝子増幅反応による検出 MDS M Molecular Detection Assay Listeria monocytogenes M M Molecular Detection Instrument M L M Lysis tube Lysis tube - Lysis tube Lysis tube L M Molecular Detection Instrument / L. monocytogenes
結果 1. 牛挽肉における検出感度試験 Fraser Fraser L. monocytogenes CFU/mL L MDS CFU/mL Data not shown 2.Ready-to-eat 食品でのMDS 法の検出評価試験 CFU/ g L. moncytogenes MDS Demi-Fraser MDS. ml ml Fraser MDS 3. 低濃度接種区における検出感度試験と前培養培地間比較試験 L. monocytogenes. MPN/ g Demi-Fraser MDS MDS No. Fraser MDS No. MDS Fraser PCR L. monocytogenes Demi-Fraser Fraser TSBYE TSBYE MDS MDS MDS 表 2. 牛挽肉を用いた L. monocytogenes の培地間評価および検出試験結果. TSBYE Demi-Fraser Demi-Fraser Fraser SampleNo. h h SampleNo. h h ISO - MDS ISO - MDS ISO - MDS ISO - MDS
考察 L. monocytogenes ATP ATP L. monocytogenes MDS L L L CFU/ L. x CFU/mL copy CFU/mL MDS L. monocytogenes Demi-Fraser Fraser MDS L. monocytogenes TSBYE MDS Demi-Fraser Fraser MDS MDS MDS TSBYE MDS MDS TSBYE MDS MDS Demi-Fraser Fraser L. monocytogenes L. monocytogenes 要約 L. monocytogenes Ready to eat M Molecular detection system MDS. MPN/g g MDS ISO - MDS MDS L. monocytogenes
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