title: Measurement of invertase activity of cells of Saccharomyces cerevisiae.
abstract: The determination of the invertase activity of intact yeast cells presents a critical point, that is, the blockage of the enzyme action at a given moment. In this paper seven blockage methods were compared: the addition of 0.010 M sodium hydroxide solution, addition of 0.010 M sodium carbonate solution, addition of 0.010 M sodium carbonate solution followed by centrifugation (9750g; 10 min), immersion of the reacting mixture in a boiling water bath, immersion of the mixture in a -15 degrees C bath, filtration through a Millipore membrane, and addition of the first Somogyi's reagent followed by immersion in a boiling water bath. Only the last two methods lead to a rapid and effective blockage of the invertase activity.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D006026:Glycoside Hydrolases / Q000302:isolation & purification*; D006358:Hot Temperature; D012441:Saccharomyces cerevisiae / Q000201:enzymology*; D013997:Time Factors; D043324:beta-Fructofuranosidase
chemical_list: D006026:Glycoside Hydrolases; D043324:beta-Fructofuranosidase