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A novel acid-stable bead made of gellan gum and xanthan gum was used to immobilize Bifidobacteria. The beads (0.75% gellan and 1% xanthan gum) had an average diameter of 3 mm and did not shrink in 25% lactic acid solution, pH 1.5, or 20% acetic acid solution, pH 1.5, after storage at 4 o C for 4 weeks. Bifidobacterium infantis ATCC 15697, the most acid-tolerant strain tested, was immobilized...
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