diastase


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diastase

(dī`əstās'): see amylaseamylase
, enzyme having physiological, commercial, and historical significance, also called diastase. It is found in both plants and animals. Amylase was purified (1835) from malt by Anselme Payen and Jean Persoz.
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diastase

[′di·ə‚stās]
(biochemistry)
An enzyme that catalyzes the hydrolysis of starch to maltose. Also known as vegetable diastase.

diastase

any of a group of enzymes that hydrolyse starch to maltose. They are present in germinated barley and in the pancreas
References in periodicals archive ?
The tendency to cweremphasize the difference between the world of the Holy Spirit and the material world disregards that living in the Spirit of God is tied to the Logos incarnate, who by becoming flesh and body has overcome the diastase, the border between God and world, and who has placed himself in relation to and in "interdependence" (8) with the world.
Diastase activity: It was measured photometrically, which was expressed in DN (diastase number), and corresponded to g starch hydrolysed/100 g honey / h, at pH 5.2 and T = 40[degrees]C, in Schade units (one diastase unit is the enzyme activity of 1 g of honey, which can hydrolyse 0.0 I g of starch in one hour at 40[degrees]C) (Vit & Pulcini, 1996).
Tumour cells with intracytoplasmic or intraluminal mucin have been reported to be positive with PAS (diastase resistant) and Mucicarmine (3, 6, 13).
Criteria such as moisture, fructose+glucose, fructose/glucose, free acidity, electrical conductivity, diastase number, proline,I'13C (protein-honey) are taken into account to determine the authenticity and quality of honey (Codex Stan,1981; Turkish Food Codex, 2005).
When determining the diastase activity in honey, the method used is based on the hydrolysis of 1% starch solution from 1 g of honey in one hour at a temperature of 40[degrees]C.
(b) PAS without diastase digestion showing granular magenta positivity in keratinocytic cytoplasms of the upper half of the squamous mucosa, typical for glycogenic acanthosis (PAS 20X).
Special stains including Periodic acid Schiff (PAS) with diastase, Perl's stain, von Kossa stain were applied which highlighted MG bodies (fig-1b,c,d,e).
Histopathology features consisted of extensive cutaneous deposition, amorphous eosinophilic material which is PAS+ and diastase resistant deposits seen in surrounding capillaries, sweat coils and in the thickened capillary dermis.
Papillary and tubulocystic patterns should be found with hobnail cells lining the cysts and mononuclear inflammatory infiltrate.[sup][6] The mucicarmine-negative, PAS-positive glycogen imparting the clarity to cells should also be diastase labile.[sup][2],[6]
To study the mucin expression, the intraluminal secretion was analysed with the Periodic Acid Schiff (PAS) reaction with and without diastase and with mucicarmine staining, both of which were positive.
They were additionally characterized by a strong Periodic Acid-Schiff- (PAS-) positive reaction (dark red) that was resistant to diastase (PAS-D) treatment.
The suffix "-ase," indicating an enzyme, is derived from "diastase" (from the Greek diastasis, "separation"), the first enzyme discovered in 1833 by Payen and Persoz.