Invertase


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invertase

[′in·vər‚tās]
(biochemistry)

Invertase

 

(also saccharase, (β-fructofuranosidase), an enzyme of the hydrolase class, contained in plants, microorganisms, and the digestive juices of animals. It catalyzes the splitting of the β-fructofuranose radical from oligosaccharides and polysaccharides, and it catalyzes the conversion of sucrose into glucose and fructose. The latter reaction is called inversion. The name “invertase” derives from the circumstance that the reaction is accompanied by a change in the sign of optical rotation, with D-sucrose converting to invert sugar, a mixture of L-glucose and L-fructose. Invertase is especially active in yeast, from which it is extracted in the form of refined enzyme preparations. It also effects the transfer of the fructofuranose radical in-certain cases.

References in periodicals archive ?
Trehalase, amylase and invertase activities were significantly decreased in 4th and 6th instar larvae of both populations.
Raich, "Invertase activity in fresh and processed honeys," Journal of the Science of Food and Agriculture, vol.
Honeys were preliminary characterized by determining their water content, electrical conductivity, specific rotation, and activity of invertase as well as by visual and organoleptic testing (Table 3).
The invertase activity was measured by reducing sugars of the reaction of 1 mL of extract, from 1 mL of a sucrose solution at 0.5 mg [mL.sup.-1] in acetate buffer pH 4.7, at 37[degrees]C, for 10 minutes.
Comparison of salt and drought stress effects on maize growth and yield formation with regard to acid invertase activity in the kernels.
A variety of enzymes, for example, oxidase, invertase, amylase, and catalase, are constituents of honey; the main enzymes are invertase (saccharase), diastase (amylase), and glucose oxidase.
Major genes of cluster 4 were coexpressed with active genes for starch degradation (amylases, hexokinase, and invertase) and sucrose synthesis (SPS and starch synthase), which indicates strong regulation of carbohydrate metabolism in HKI1532: SPS and starch synthase were suppressed in PC3 but expressed 7-fold to 8-fold higher in HKI1532.
Different physiological properties of yeast such as invertase activity, flocculation, ethanol tolerance, hyperosmotic tolerance, temperature tolerance, and C[O.sub.2] production for a strain to be used as a commercial baker's were also analyzed [12, 13].
Ergene, "Covalent immobilization of invertase on microporous pHEMA-GMA membrane," Food Chemistry, vol.