Results 161 to 170 of about 3,513 (189)
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Analytical Biochemistry, 1979
Abstract The activity of diamine oxidase (DAO) in amniotic fluid was measured by three different methods. The first two, one colorimetric and the other fluorometric, depended on the coupled peroxidase assay. The other was a radiochemical procedure. The latter proved to be a reliable method, free from interference and linear over a wide range of time ...
E, Neufeld, R, Chayen
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Abstract The activity of diamine oxidase (DAO) in amniotic fluid was measured by three different methods. The first two, one colorimetric and the other fluorometric, depended on the coupled peroxidase assay. The other was a radiochemical procedure. The latter proved to be a reliable method, free from interference and linear over a wide range of time ...
E, Neufeld, R, Chayen
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An improved spectrophotometric assay for histamine and diamine oxidase (DAO) activity
Agents and Actions, 1985Diamine oxidase or its substrates can be measured using a coupled reaction with peroxidase and the chromogen 3-methyl-2-benzothiazolone hydrazone (MBTH) with an appropriate acceptor such as 3-(dimethylamino)benzoic acid (DMAB). This method provides a more rapid and sensitive method of measuring histamine than current colorimetric assays; using this ...
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Biochemical Pharmacology, 1976
Abstract High diamine oxidase (DAO) and histamine activity are present in rat intestine, thymus and adrenals, and a close correlation exists between the two activities in these tissues ( Biochem. Pharmac. 24 , 979 (1975)). The distribution of histaminase in normal and germ-free rat tissues and the release of this enzyme from intestine, thymus and ...
R E, Shaff, M A, Beaven
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Abstract High diamine oxidase (DAO) and histamine activity are present in rat intestine, thymus and adrenals, and a close correlation exists between the two activities in these tissues ( Biochem. Pharmac. 24 , 979 (1975)). The distribution of histaminase in normal and germ-free rat tissues and the release of this enzyme from intestine, thymus and ...
R E, Shaff, M A, Beaven
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Diamine oxidase (DAO) activity and intestinal mucosa integrity: influence of suture techniques
Agents and Actions, 1987After various kinds of intestinal mucosal injuries, whether by disease or by experiment, the diamine oxidase activity is reduced. Therefore, we studied the effect of surgical manipulations on the intestinal mucosa and diamine oxidase activity. The reaction of the gut on the insertion of sutures was a transient increase of the enzymic activity followed ...
R, Mennigen +3 more
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Agents and Actions, 1990
The key-enzyme for the metabolism of diamines in man is diamine oxidase (DAO). Its highest activities are in the intestinal mucosa, localized in the cytoplasm of the mature enterocytes of the small and large bowel. If the gut is affected by inflammation in Crohn's disease macroscopical changes are observed.
J Sattler, R Hesterberg, H D Röher
exaly +3 more sources
The key-enzyme for the metabolism of diamines in man is diamine oxidase (DAO). Its highest activities are in the intestinal mucosa, localized in the cytoplasm of the mature enterocytes of the small and large bowel. If the gut is affected by inflammation in Crohn's disease macroscopical changes are observed.
J Sattler, R Hesterberg, H D Röher
exaly +3 more sources
How reliable are DAO supplements? — A comparison of over-the-counter Diamine oxidase products
2023Abstract Diamine oxidase (DAO) supplements have gained increasing attention in recent years due to their potential to support DAO deficiency, histamine intolerance and related symptoms. However, choosing a reliable and trustworthy DAO supplement can be a challenging task for patients and Healthcare practitioners.
Marc Alemany-Fornes +4 more
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Some problems with the diamine oxidase (DAO) assay using putrescine as substrate in rat liver
Agents and Actions, 1993Determination of diamine oxidase (DAO) activity in rat liver preparations by measuring the formation of radioactive delta 1-pyrroline from 14C-putrescine is complicated by the complexity of competing metabolic pathways. This can lead to complete masking of the DAO activity present when rat liver homogenates are used as the enzyme source.
G, Ignesti +4 more
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Changes in serum and intestinal diamine oxidase (DAO) activity after proximal enterectomy in rats
Digestive Diseases and Sciences, 1989To determine whether serum and mucosal DAO activity reflects quantitative changes in the small bowel mucosal mass, we have chosen an experimental model of mucosal hyperplasia which is known to occur in the rat after enterectomy. A 50% proximal enterectomy or a single transection was performed in 20 growing rats weighing 145-160 g.
J P, Buts +3 more
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Acta Physiologica Scandinavica, 1973
AbstractThe postheparin DAO increase in blood plasma has been shown to depend on intact intestines in rat and rabbit. Our findings indicate, however, that sources of mobilizable DAO may be found also outside the small intestine in these species. In the rat, after partial portal stricture for a week.
R, Hansson, H, Thysell
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AbstractThe postheparin DAO increase in blood plasma has been shown to depend on intact intestines in rat and rabbit. Our findings indicate, however, that sources of mobilizable DAO may be found also outside the small intestine in these species. In the rat, after partial portal stricture for a week.
R, Hansson, H, Thysell
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Agents and Actions, 1988
In the intestinal mucosa, diamine oxidase (DAO) seems to be involved in a feed-back regulation mechanism for the termination of proliferation. Therefore, we studied the DAO activity in large bowel tumors and in the non-affected mucosa of these patients in comparison with patients having a normal large mucosa. The DAO activity in the tumor tissue itself
R, Mennigen +6 more
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In the intestinal mucosa, diamine oxidase (DAO) seems to be involved in a feed-back regulation mechanism for the termination of proliferation. Therefore, we studied the DAO activity in large bowel tumors and in the non-affected mucosa of these patients in comparison with patients having a normal large mucosa. The DAO activity in the tumor tissue itself
R, Mennigen +6 more
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