We used the autoinducing medium for growth and expression of the recombinant lipase LipA PSA01: tryptone, yeast extract, lactose, glucose, glycerol, lactose, potassium dihydrogen phosphate, disodium hydrogen phosphate, ammonium chloride, and magnesium sulfate were purchased from PanReac AppliChem (Barcelona, Spain). All solvents (hexane, ethanol, acetone, 2-propanol, ethyl acetate, and methanol) were acquired from JT Baker (Phillipsburg, NJ, USA). Gas chromatography standards and other chemicals used in this study (sodium, sodium hydroxide, TRIS, acetic acid, HEPES) were analytical reagents obtained from Sigma Aldrich (St Louis, Mo, USA).
Lactose
Lactose is a disaccharide sugar composed of galactose and glucose. It is the primary sugar found in milk and dairy products. Lactose serves as a source of energy and carbohydrates in various laboratory applications.
Lab products found in correlation
4 protocols using lactose
Recombinant Lipase LipA PSA01 Production
We used the autoinducing medium for growth and expression of the recombinant lipase LipA PSA01: tryptone, yeast extract, lactose, glucose, glycerol, lactose, potassium dihydrogen phosphate, disodium hydrogen phosphate, ammonium chloride, and magnesium sulfate were purchased from PanReac AppliChem (Barcelona, Spain). All solvents (hexane, ethanol, acetone, 2-propanol, ethyl acetate, and methanol) were acquired from JT Baker (Phillipsburg, NJ, USA). Gas chromatography standards and other chemicals used in this study (sodium, sodium hydroxide, TRIS, acetic acid, HEPES) were analytical reagents obtained from Sigma Aldrich (St Louis, Mo, USA).
Lactose Fermentation and Nitrate Reduction Assays
lactose fermentation was tested in a modified API 50CH medium containing the following: lactose 5 or 20 g.L−1 (Panreac, Lyon, France), tryptone 10 g.L−1, yeast extract 5 g.L−1, K2HPO4, 0.25 g.L−1, MnSO4 0.05 g.L−1, and bromocresol purple 0.17 g.L−1. The medium was inoculated using 1% (v/v) of 48-h cultures in YEL, and incubated at 30 °C under anaerobiosis (using the Anaerocult A system, Merck, Darmstadt, Germany). The production of acid from lactose was determined from the colour change of bromocresol purple from purple to yellow after 2, 5, and 7 days of incubation.
Nitrate reductase activity was detected by means of the Griess reagent (Biomérieux, Marcy l'Etoile, France) after incubation of cultures at 30 °C under microaerophilic conditions (air atmosphere without agitation) in a broth containing potassium nitrate, 0.5 or 1.5 g.L−1 (VWR International, Fontenay-sous-Bois, France), tryptone (Biokar Diagnostics, Allone, France) 10 g.L−1, yeast extract (Biokar Diagnostics) 5 g.L−1, and glucose (Grosseron, Saint-Herblain, France) 1 g.L−1, according to Dalmasso et al. (2011 (link)). The results of the tests were read after 2 and 5 days of incubation.
All the tests were carried out in triplicate.
Porcine Collagen Extraction and Characterization
Cod Fish Gelatin-based Bioactive Film
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