2.2. Resistance to artificial gastric conditions
The resistance of Lactobacillus sp. to artificial gastric conditions was determined ( Lee, Lee, & Paik, 2013). Stationary-phase-grown cells of LAB were harvested at 10,000 × g for 15 min, washed with 0.1% peptone water, and added to artificial gastric acid, and incubated at 37 °C for 2 h. The artificial gastric acid was MRS broth containing 1% pepsin (Sigma, St. Louis, MO, USA), adjusted to pH 2.5 by the addition of 0.1 M HCl. Resistance to artificial bile acid was measured by cultivating cells treated with artificial gastric juice (MRS broth containing 0.3% (w/v) oxgall (BD BBL)). Viable cell counts were measured by incubating aliquots for 24 h on MRS agar at 37 °C.
2.2. Resistance to artificial gastric conditionsThe resistance of Lactobacillus sp. to artificial gastric conditions was determined ( Lee, Lee, & Paik, 2013). Stationary-phase-grown cells of LAB were harvested at 10,000 × g for 15 min, washed with 0.1% peptone water, and added to artificial gastric acid, and incubated at 37 °C for 2 h. The artificial gastric acid was MRS broth containing 1% pepsin (Sigma, St. Louis, MO, USA), adjusted to pH 2.5 by the addition of 0.1 M HCl. Resistance to artificial bile acid was measured by cultivating cells treated with artificial gastric juice (MRS broth containing 0.3% (w/v) oxgall (BD BBL)). Viable cell counts were measured by incubating aliquots for 24 h on MRS agar at 37 °C.
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