乳酸バクテリアを生成するエクソポリサッカライドの選択と特徴付け
Dor Zipori1, Merlin Brychcy1, Agnes Weiss2
1Department of Food Microbiology and Hygiene, Institute of Food Science and Biotechnology, University of Hohenheim, Garbenstrasse 28, 70599, Stuttgart, Germany.
Food microbiology
|September 1, 2025
まとめ
研究者らは,有益な細菌 β-グルカンを生成できる新しい乳酸細菌 (LAB) 株を特定しました. これらの菌株は食品発酵に安全であり,特に果物ベースのアプリケーションで強化された食品の可能性を提供します.
科学分野:
- 食品微生物学
- バイオテクノロジー
- 発酵科学
背景:
- 乳酸バクテリア (LAB) は発酵食品に不可欠であり,食品の質感と機能性を向上させるエクソポリスハカリド (EPS) を生成する.
- バクテリア β-グルカンは,LABの特定のEPSであり,望ましいレオロギー特性と健康上の利点を持ち,食品用途に価値があります.
研究 の 目的:
- 食品発酵,特にフルーツベースの製品のためのβ-グルカンを生産できるLAB株を特定し,特徴づけること.
- 選択されたβ-グルカンを産生するLAB菌株の安全性とゲノム特性を評価し,スタートカルチャーとして潜在的に使用する.
主な方法:
- 246 LAB 単離物のフェノタイプとゲノタイプを組み合わせたスクリーニング
- β-グルカン合成酵素をコードする gtf-2 遺伝子を持つ菌株の特定
- 選択された株のゲノム,代謝,安全性評価
主要な成果:
- Lacticaseibacillus paracasei LTH 2407を含む6つのEPS産生LAB株が選択されました (GTF-2を持つその属の中で初めて).
- ゲノム分析により,多様な食品マトリックスに適した株特有の代謝プロファイルが明らかになった.
- 安全性評価では,毒素,抗菌剤耐性,または重要な生物学的アミン生成遺伝子が確認されていません.
結論:
- 選択されたLAB菌株,特にLacticaseibacillus paracasei LTH 2407は,食品発酵のスタートカルチャーとして安全な使用の可能性を示しています.
- これらのβ-グルカンを産生する菌株は,果物ベースの食品を含む発酵食品を改良する有望な候補である.
- 発酵性能と産業関連性に関するさらなる研究が必要である.
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