Heat Resistance of <i>Alicyclobacillus Hesperidum </i>Spores

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  • Goto Keiichi
    School of Marine Science and Technology, Tokai University
  • Oiri Katsuki
    School of Marine Science and Technology, Tokai University
  • Sato Eiri
    School of Marine Science and Technology, Tokai University
  • Kubota Kaori
    School of Marine Science and Technology, Tokai University
  • Suzuki Keiko
    School of Marine Science and Technology, Tokai University
  • Niida Yusuke
    School of Marine Science and Technology, Tokai University
  • Tajima Erina
    School of Marine Science and Technology, Tokai University
  • Fujii Taichi
    School of Marine Science and Technology, Tokai University
  • Yasui Kazuki
    School of Marine Science and Technology, Tokai University

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Other Title
  • <i>Alicyclobacillus hesperidum</i>芽胞の耐熱性
  • Alicyclobacillus hesperidum芽胞の耐熱性
  • Alicyclobacillus hesperidum ガホウ ノ タイネツセイ

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Abstract

<p>Alicyclobacillus species are aerobic, acidophilic, and thermophilic Gram-positive spore-forming bacilli. Some Alicyclobacillus species produce guaiacol, which exhibits a medicinal off-odor, and cause food spoilage. Although A. hesperidum has no ability to produce guaiacol, it has recently been found that strains very similar to A. hesperidum have the ability to produce guaiacol. Regarding to control methods for Alicyclobacillus, much information has been accumulated in A. acidoterrestris and A. acidocaldarius. However, since A. hesperidum had been recognized as not producing guaiacol, there is no knowledge about control methods for the species. Therefore, we investigated the heat resistance of spores on A. hesperidum and its related strains. The D values of the spores of A. hesperidum and its related strains in PBS were D107 °C＝2.2±0.7-2.9±0.1 and in 100 % orange juice were D107 °C＝1.9±0.3-2.1±0.3, and are higher than those of A. acidoterrestris (D95 °C＝2.3±0.5 and 2.1±0.1, respectively). From the results, it was indicated that A. hesperidum and its related strains could not be sterilized by general condition of heat sterilization for acidic beverages targeting A. acidoterrestris (110-115 °Cfor about 0.5 minutes).</p>

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