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Topic: Amadori rearrangement

	Involvement of Hydrogen Peroxide in Collagen Cross-linking by High Glucose in Vitro and in Vivo -- Elgawish et al. 271 ...
		In the presence of Amadori compounds, kinetic changes were dramatically increased and were preventable by addition of catalase to the medium.
		In order to investigate the impact of pre-existing tendon-linked Amadori products on cross-linking and glycoxidation, identical incubations were carried out with tendons that were first preglycated for 10 days under anaerobic conditions in order to minimize cross-linking and glycoxidation.
		In the case of CML, both the presence of glycosylamine and Amadori products were major contributors to CML formation, most likely by a mechanism involving glyoxal formation (8, 9).
	www.jbc.org /cgi/content/full/271/22/12964 (6183 words)

	U.S. Patent: 5541159 - Calcitonin derivatives - July 30, 1996
		By Amadori sugar residue as may be present in the LHRH antagonists of the invention in position 8 is to be understood a sugar residue obtainable by means of an Amadori or Heyns rearrangement, for example a residue of formula (Ia) or (Ib), e.g.
		In the Amadori sugar residue of formula (Id.sub.3) or (Id.sub.4), -NH-Q"- or -NH-Q'"- is preferably a -NH-C.sub.b H2.sub.b -CO-radical wherein b is preferably an integer from 1 to 3.
		In addition to the Amadori sugar residue in 8 position, or to the residues (b.sub.1) and/or (b.sub.2), the LHRH antagonists of the invention may bear one or two sugar residues of formula (Ia) to (Id) above, e.g.
	www.everypatent.com /comp/pat5541159.html (9282 words)

	United States Patent Application: 0030017995
		It was found that this Maillard reaction occurred in vivo as well, when it was found that a glucose was attached via an Amadori rearrangement to the amino-terminal of the.alpha.-chain of hemoglobin.
		The identification of the reactive intermediate as an Amadori product is well supported by the amino acid analysis carried out (after sodium cyanoborohydrate reduction) before and after dialysis at the 24 h interruption point.
		Its isolation by the interruption procedure is of importance for kinetic and structural studies, since it allows one to make studies in the absence of free or Schiff base bound sugar and their attendant reactions and complications.
	appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&s1='20030017995'.PGNR.&OS=DN/20030017995&RS= (17267 words)

	Novel Degradation Pathway of Glycated Amino Acids into Free Fructosamine by a Pseudomonas sp. Soil Strain Extract -- ...
		The first major modification from which most subsequent advanced glycation compounds are formed is a ketoamine originating through Amadori rearrangement of the Schiff base initially formed by the reaction of glucose with protein amino groups.
		The enzymatic activity was assayed polarographically with a Clark type oxygen electrode (Beckman) at 25 °C. The assay mixture continuously stirred within the electrode chamber consisted of 100 µl of bacterial extract in 1.3 ml of 0.1 M sodium phosphate buffer (pH 7.4).
		The likelihood that the Amadori product degrading activity was membrane-bound was suggested by an experiment in which the insoluble pellet from the French press was further fractionated by differential centrifugation in the presence of 0.5% deoxycholate.
	www.jbc.org /cgi/content/full/270/1/218 (5345 words)

	World Intellectual Property Organization (Site not responding. Last check: 2007-10-13)
		Considerable interest has focused on the Amadori product that is the most important"early"modification during nonenzymatic glycation in vitro and in vivo.
		As used herein, a"glycated protein"refers to a substance which is produced by the non-enzymatic and irreversible binding of the amino group of an amino acid constituting a protein, with the aldehyde group of a reducing sugar such as aldose.
		The H202 released is measured by a colorimetric Trinder end-point reaction.
	www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=05/17136.050224&ELEMENT_SET=DECL (6649 words)

	Dojindo Molecular Technologies
		3-DG is generated by the amadori rearrangement reaction and self oxidation of fluctose.
		Another dicarbonyl compound, 3-Deoxyglucosone (3-DG), is also known to be one of the AGE precursors.
		3-DG is derived from the Amadori rearrangement products of proteins and sugars in early stages of the Maillard reaction.
	www.dojindo.com /products/alphasearch/dojindodtl1.cfm?alphafield=Deoxyglucosone&ProdName=3-Deoxyglucosone (476 words)

	Disposition and Covalent Binding of Diflunisal and Diflunisal Acyl Glucuronide in the Isolated Perfused Rat Liver -- ...
		rearrangement isomers (iso-DAG), each administered at 30-µg DF equivalents/ml perfusate (four recirculating perfusions each group).
		Rearrangement occurs by intramolecular acyl migration and anomerization of the isomers.
		In summary, DAG is a reactive acyl glucuronide metabolite that is disposed in the perfused rat liver by hydrolysis, rearrangement,
	dmd.aspetjournals.org /cgi/content/full/26/2/98 (4533 words)

	TSRI - News and Publications
		This unique and heretofore undetected ability of a metabolite to form enamine structures under aqueous conditions led us to consider other physiologically relevant chemical reactions that make use of similar intermediates.
		The Amadori rearrangement fit these requirements, and we hypothesized that nornicotine would form the corresponding Amadori product (compound 2 in Fig.
		Furthermore, this reaction scenario implied that this Amadori product could be an early intermediate in the glycation of proteins by nornicotine.
	www.scripps.edu /news/sr/sr2003/chm0305.html (1988 words)

	The MACiE Dictionary (Site not responding. Last check: 2007-10-13)
		Acid or base catalysed rearrangement of N-glycosides of aldoses to N-glycosides of the corresponding ketoses.
		This is an Sn2 reaction with concurrent allylic rearrangement.
		Molecular rearrangement involving both the creation of a new s-bond between atoms previously not directly linked and the breaking of an existing s-bond.
	www-mitchell.ch.cam.ac.uk /macie/glossary.html (3307 words)

	Maillard Reaction (Site not responding. Last check: 2007-10-13)
		The initial reaction is the condensation of the carbonyl group of a reducing sugar (aldose) with a free amino group of a protein or an amino acid, which loses a molecule of water to form N-substituted glycosylamine (Step A).
		This is unstable and undergoes the "Amadori rearrangement" to form "1-amino-1-deoxy-2-ketoses" (known as "ketosamines") (step B).
		Studies of model systems showed that an increase in temperature and/or time of heating resulted in increases in colour development, the carbon-to-nitrogen ratio and the degree of unsaturation and the chemical aromaticity.
	www.landfood.ubc.ca /courses/fnh/410/colour/3_82.htm (686 words)

	Kinetics of Nonenzymatic Glycation of Ribonuclease A Leading to Advanced Glycation End Products. Paradoxical Inhibition ... (Site not responding. Last check: 2007-10-13)
		As anticipated, the kinetics of glycation by ribose were considerably faster than by glucose, and the rate of AGE formation initially increased with increasing sugar concentrations.
		The kinetics of buildup of the Amadori intermediates and the kinetics of their post-Amadori conversion to antigenic AGEs were then independently studied.
		A rapid and reversible inhibition of the post-Amadori kinetics by free ribose was verified by direct re-addition of ribose to the isolated, sugar-free intermediate.
	pubs.acs.org /cgi-bin/jtext?bichaw/35/i15/abs/bi9525942 (412 words)

	United States Patent: 6,692,788 (Site not responding. Last check: 2007-10-13)
		The third stage involves dehydration and or fission of the Amadori and Heyns rearrangement products to furan derivatives, reductones and other carbonyl compounds (which may have significant organoleptic qualities).
		In the interests of convenience and cost efficiency, it is often desirable to reduce the time and/or temperature used in the cooking of various foods.
		The use of a non-sulphur-containing reductone ensures that the precursors of the invention enter the Millard reaction at a point prior to substitution with sulphur moieties or amino moieties from amino acids (e.g.
	spore.patentmatrix.com /Projects/WNCCTC/BOS/6692788.html (4594 words)

	Leading Article (Site not responding. Last check: 2007-10-13)
		the shift in the position of the carbonyl group (from C1 to C2) during the Amadori rearrangement.
		The level of oxidizable substrate (glucose, Amadori adducts, reactive carbonyl and dicarbonyl compounds and polyunsaturated fatty acids) is increased in blood and tissues in diabetes and the changes in ascorbate, atocopherol and glutathione concentration are consistent with decreased antioxidant protection.
		Thus, increased levels of oxidative stress may be present in diabetes, but may be both a cause and an effect of tissue damage [10].
	www.d4pro.com /IDM/site/leading2.htm (2594 words)

	CT Valley Hop Dogs: Maillard Reactions (Site not responding. Last check: 2007-10-13)
		This is unstable and undergoes the famous "Amadori rearrangement" to form "1-amino-1-deoxy-2-ketoses" (known as "ketosamines") which can undergo complex subsequent dehydration, fission and polymerization reactions.
		But now in Maillard, there are a few guys called Schiff, Amadori and Strecker in your beer!
		The ketosamine products of the Amadori rearrangement can then react three ways in the second phase.
	www.hopdogs.com /articles/maillard.php (1388 words)

	DSM Food Specialties - Galactose dialdehyde as potential protein cross-linker
		Combined enzymatic oxidation of D-galactose by D-galactose oxidase [EC 1.1.3.9] in water, amination with butylamine, and oxalic acid catalyzed Amadori rearrangement in methanol yielded 1,6-bis(butylamino)-1,6-dideoxy-erythro-hexo-2,5-diulose, demonstrating how in situ formed galacto-hexodialdose can be used to cross-link protein residues.
		The various species formed during this three-step conversion are present as bicyclic structures in solution as established by 13C labeling and in situ NMR spectroscopy of the reaction mixtures.
		Using protein (gelatin) instead of butylamine, distinct Amadori product formation was observed using 99% enriched D-(1-13C)- and D-(2-13C)- galactose.
	www.dsm.com /en_US/html/dfs/rnd_publ_galact_dialdeh.htm (131 words)

	Diabetes: Mechanistic studies of advanced glycosylation end product inhibition by aminoguanidine (Site not responding. Last check: 2007-10-13)
		Inhibition of AGE formation occurring with undetectable differences in the level of Amadori product is consistent with the relatively small number of amino groups involved in AGE formation[18].
		These findings are relevant to the potential clinical use of aminoguanidine in the prevention of diabetic complications[19,20], because neither stabilization of potentially harmful Amadori products by aminoguanidine nor formation of potentially antigenic aminoguanidine-glycosylated peptide adducts appears to occur.
		Thus, any macromolecular dysfunction caused by excessive Amadori product formation alone could be reversed with normoglycemia, whereas irreversible dysfunction caused by formation of AGES would be prevented by aminoguanidine treatment.
	www.findarticles.com /p/articles/mi_m0922/is_n1_v41/ai_12368181/pg_2 (766 words)

	Tramadol, buy tramadol, antibiotics, Weight Loss drugs, weight loss herbs, weight loss herbal formula, hair loss, hair ...
		The fate of the Amadori compound N-(1-deoxy-D-fructos-1-yl)glycine (DFG) was studied in aqueous model systems as a function of time and pH.
		The samples were reacted at 90 degrees C for up to 7 h while maintaining the pH constant at 5, 6, 7, or 8.
		The rate of parent sugar formation increased from pH 5 to pH 7 in the absence of phosphate, leading to glucose and mannose in a constant ratio of 7:3.
	hair-loss-stop.com /ref-glycine/glycine-research-abs4.218.html (1561 words)

	Untitled Document (Site not responding. Last check: 2007-10-13)
		In a first step, a Schiff aldimine base is produced that is likely to undergo an Amadori rearrangement to produce a ketoamine, also called Amadori product.
		Fructosyl-lysine, resulting from the reaction between glucose and lysine or protein lysine residues, is considered as one of the most important Amadori product in stored or heat-treated proteinic foods.
		Depending on the type of processed food, Maillard reaction should be favoured or avoided by controlling several parameters, such as pH, temperature, concentration of reactants...
	etseq.urv.es /dinamic/transfronterera2004/catala/aplicacions/oral3.htm (322 words)

	9_3
		Furfural formation direct from sugars is characteristic of relatively acidic systems.
		However, furfural formation at mild pH is catalyzed by amino acids that participate in the Amadori rearrangement.
		The formation of reductones(where n= 0 or 2) can rise from the Amadori arrangement product, furfurals or through recombinant aromatization reactions.
	animalscience.unl.edu /451/forage9/9_3.htm (167 words)

	[No title] (Site not responding. Last check: 2007-10-13)
		Casein-maltodextrin conjugates were prepared using an economical, food-grade process based on the Amadori rearrangement of the Maillard reaction.
		It was demonstrated that alpha-1,4 substituted polysaccharides (maltodextrins) could be used to form stable, colourless casein-glycoconjugates that were not subject to post-Amadori Maillard reaction steps.
		Dairy glycoconjugates prepared from natural ingredients using this food-grade process have significant potential as effective food emulsifiers or soluble protein additives for acidic sports drinks/nutritional supplements.
	www.elsevier.com /cdweb/journals/0268005X/articles/14/4/S0268005X9900067.abstract.en (106 words)

	BCHM-GRM unit
		Fructosamines form as a result of a spontaneous condensation reaction of glucose with primary amines, followed by an Amadori rearrangement (Fig.
		Fructosamines slowly convert to advanced glycation endproducts, which are thought to play a role in the development of diabetic complications.
		Glucose spontaneously reacts with primary amines of proteins to form Schiff bases, which spontaneously rearrange to fructosamines.
	www.icp.ucl.ac.be /grm/Carbohydrate/fructosamine.htm (289 words)

	Nat' Academies Press, High-Energy, Nutrient-Dense Emergency Relief Food Product (2002)
		series of reactions that start with the formation of Amadori compounds from aldose or hexose carbonyl compounds condensing with free amino groups of amino acids or protein.
		The condensing product is a Schiffs base that later becomes aldosylamine, and this, in turn, is converted into ketosamines in the Amadori rearrangement.
		The final step involves formation of melanoidins, which are brown nitrogenous polymers or copolymers.
	www.nap.edu /openbook.php?record_id=10347&page=103 (744 words)

	Name reactions
		The Merck Index (USA) [E] Benzilic Acid Rearrangement
		The Merck Index (USA) [E] Curtius Rearrangement (Reaction)
		The Merck Index (USA) [E] Heteroatom Rearrangements on Nitrogen
	www.chemlin.de /chemistry/name_reactions.htm (1360 words)

	Mutagenesis by environmental pollutants and biomonitoring of environmental mutagens (Site not responding. Last check: 2007-10-13)
		AGEs form by the Maillard process, a non-enzymatic reaction between ketones or aldehydes and the amino groups of proteins that contributes to the aging of proteins and to the pathological complications of diabetes [7-10, 23].
		The concentration of an Amadori product in CSF correlated with the CSF glucose concentration but did not change with age.
		In contrast, the level of CSF Amadori product was 1.7 times greater in AD patients than in a non-demented age-matched control group.
	www.bentham.org /1-1/car1-1/takeuchi/takeuchi-ms.htm (4603 words)

	Glucosylated Glycerophosphoethanolamines are the Major LDL Glycation Products and Increase LDL Susceptibility to ... (Site not responding. Last check: 2007-10-13)
		Schemes of Glc PtdEtn, which may occur in LDL as Schiff base adduct or its Amadori rearrangement product.
		Fragmentation pattern of 16:0 to 18:2 GroPEtn generated by increasing the capillary exit voltage from 160 to 300 V. A, Fragmentation pattern in the negative mode of ionization; B, fragmentation in the positive mode of ionization.
		Amadori products from model reactions of D-glucose with phosphatidyl ethanolamine: independent synthesis and identification of 1-deoxy-1-(2-hydroxyethylamino)-D-fructose derivatives Carbohydr Res..
	atvb.ahajournals.org /cgi/content/full/20/2/467 (5363 words)

	Vascular Smooth Muscle Cell Activation by Glycated Albumin (Amadori Adducts) -- Hattori et al. 39 (1): 22 -- ...
		Amadori adducts exert similar biological effects on VSMCs, we
		Amadori albumin in type 1 diabetic patients: correlation with markers of endothelial function, association with diabetic nephropathy, and localization in retinal capillaries.
		Ichiki T, Funakoshi Y, Ito K, Takeshita A. Expression of monocyte chemoattractant protein-1 by nonenzymatically glycated albumin (Amadori adducts) in vascular smooth muscle cells.
	hyper.ahajournals.org /cgi/content/full/39/1/22 (3834 words)

	Kinetic analysis of glycation as a tool for assessing the half-life of proteins.
		Kinetic analysis of glycation as a tool for assessing the half-life of proteins.
		Glycation of proteins, a common postribosomal modification, proceeds via Amadori rearrangement to yield a stable ketoamine linkage of glucose with the protein.
		Kinetic analysis of the reaction shows that the amount of glycation at steady state is proportional to the glucose concentration, to protein half-life and to the rate of glycation.
	www.arclab.org /medlineupdates/abstract_3768412.html (276 words)

	Kinetic analysis of the nonenzymatic glycosylation of hemoglobin -- Higgins and Bunn 256 (10): 5204 -- Journal of ... (Site not responding. Last check: 2007-10-13)
		rearrangement of this complex to form the stable ketoamine, Hb AIc.
		D-[14C]glucose in order to remove a rapidly reacting contaminant.
		The rate of the Amadori rearrangement (kappa 2) was
	intl.jbc.org /cgi/content/abstract/256/10/5204 (323 words)

	ABC Online Forum (Site not responding. Last check: 2007-10-13)
		This is unstable and undergoes the famous "Amadori rearrangement" to
		But now in Maillard, there are a few guys called Schiff, Amadori
		The ketosamine products of the Amadori rearrangement can then react three
	www2b.abc.net.au /science/k2/stn/archives/archive69/newposts/796/topic796366.shtm (1617 words)

	Biologically active 1-aminodeoxy and 1-O-alkyl derivatives of the powerful D-glucosidase inhibitor ... (Site not responding. Last check: 2007-10-13)
		By an Amadori rearrangement of easily available 5-azido-5-deoxy-d-glucofuranose with dibenzylamine and subsequent catalytic hydrogenation of the resulting 5-azido-1-(N,N-dibenzyl)amino-1,5-dideoxy-d-fructopyranose, 1-amino-1,2,5-trideoxy-2,5-imino-d-mannitol was obtained in only two steps and in excellent overall yield.
		The reported rearrangement reaction is a high yielding, convenient and apparently general entry to 1-aminodeoxyketopyranoses modified at C-5, facilitated by the ring enlargement of the aldofuranose to the ketopyranose as an addnl.
		A range of selected chain extended analogs was prepd.
	www.aglycon.at /cms/beitrag/10000248/5655 (182 words)

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