The Determination of Small Concentrations of Carbonyl Groups in Starch by the Cyanohydrin Method

Schmorak, J.; Lewin, Menachem

doi:10.1021/ac60178a039

Cited by 13 publications

(3 citation statements)

References 18 publications

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“…Carbonyl and carboxyl contents in oxidized starches were measured as described by Schmorak and Lewin [7] and Mattison and Legendre [8], respectively. Hydroxylpropyl content was measured as described by Johnson [9].…”

Section: Degree Of Polymerization Of Modified Starch and Carbonyl Cmentioning

confidence: 99%

Thin‐Boiling and Nongelling Adhesive Prepared from Maize and Wheat Starches

Chung

Seib

1991

Starch Stärke

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To prepare thin‐boiling and nongelling adhesives, granular wheat and corn starches were thinned by treatment with aqueous hydrochloric acid or sodium hypochlorite and then hydroxypropylated with propylene oxide. Chlorine oxidation gave more rapid chain cleavage and whiter products with better freeze‐storage stability than acid‐treatment. Under the same depolymerization conditions, wheat starch was converted to a low viscosity granular starch more rapidly than corn starch. The best adhesive, judged by bonding strength, viscosity stability, and freeze‐thaw stability, resulted from wheat or corn starch oxidized with 0.82% Cl at pH 8.0 for 1 h followed by hydroxypropylation to molar substitution (M.S.) ∼ 0.07.

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Section: Degree Of Polymerization Of Modified Starch and Carbonyl Cmentioning

confidence: 99%

Thin‐Boiling and Nongelling Adhesive Prepared from Maize and Wheat Starches

Chung

Seib

1991

Starch Stärke

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“…Carbonyl Hb derivatives were quantified using the method [75] with minor modifications. The method consists in inducing the formation of covalent adducts of carbonyl (aldo-and keto-) groups) with DNPH, spectrophotometrically recorded at 13 wavelengths.…”

Section: Determining Of Protein Carbonylsmentioning

confidence: 99%

Protective Effect of Dinitrosyl Iron Complexes Bound with Hemoglobin on Oxidative Modification by Peroxynitrite

Kosmachevskaya

Nasybullina

Шумаев

et al. 2021

IJMS

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Dinitrosyl iron complexes (DNICs) are a physiological form of nitric oxide (•NO) in an organism. They are able not only to deposit and transport •NO, but are also to act as antioxidant and antiradical agents. However, the mechanics of hemoglobin-bound DNICs (Hb-DNICs) protecting Hb against peroxynitrite-caused, mediated oxidative modification have not yet been scrutinized. Through EPR spectroscopy we show that Hb-DNICs are destroyed under the peroxynitrite action in a dose-dependent manner. At the same time, DNICs inhibit the oxidation of tryptophan and tyrosine residues and formation of carbonyl derivatives. They also prevent the formation of covalent crosslinks between Hb subunits and degradation of a heme group. These effects can arise from the oxoferryl heme form being reduced, and they can be connected with the ability of DNICs to directly intercept peroxynitrite and free radicals, which emerge due to its homolysis. These data show that DNICs may ensure protection from myocardial ischemia.

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“…Der Verbrauch des Titrationsmittels wird kontinuierlich in Abhangigkeit von der Reaktionsgeschwindigkeit zunachst in Intervallen von 1 -2 min, dann von 5 min (1 -2 h), von 10 min (2 -4 h) und von 15 min (4 -6 h), nach Subtraktion des Blindwertes abgelesen. Der Oximierungsvorgang wurde fur jede Oxycelluloseprobe bei 20, 23,25,28,30 und 35°C verfolgt. Die Reaktion wurde bei 20, 23 und 25°C fur 10 h, bei 28 und 30 "C fur 8 h und bei 35 "C fur 7 h verfolgt.…”

Section: Experimentellesunclassified

Indirekte klassifikation von sechs oximierenden aldehydgruppen in oxycellulose nach dem polymerisationsgrad

Bláha

Černý

Jahn

1984

Angew. Makromol. Chem.

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Die stufenweise Oximierung bei 20, 23, 25, 28, 30 und 35°C ermöglichte die qualitative und quantitative Trennung von sechs verschiedenen Aldehydgruppen in Oxycellulose. Für die Berechnung des Gehaltes bn der n‐ten Aldehydgruppe bei einer bestimmten Oximierungstemperatur wurde eine modifizierte Berechnungsmethode nach einer verbesserten Gleichung angewandt. Das vorgeschlagene Verfahren ermöglichte die Charakterisierung der chemischen Strukturen von sechs verschiedenen Aldehydgruppen in Oxycellulosemakromolekülen. Es wurden lineare Abhängigkeiten zwischen den Gehalten an diesen Aldehydgruppen sowie den Aldehydsummenwerten und DP‐Werten bei logarithmischer Darstellung gefunden, die eine indirekte und schnelle Aldehydbestimmung in Oxycellulosen über den DP‐Wert ermöglichte. Für die indirekte Bestimmung der Aldehydgruppen über den DP‐Wert wurde ein Computerprogramm ausgearbeitet.

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The Determination of Small Concentrations of Carbonyl Groups in Starch by the Cyanohydrin Method

Cited by 13 publications

References 18 publications

Thin‐Boiling and Nongelling Adhesive Prepared from Maize and Wheat Starches

Thin‐Boiling and Nongelling Adhesive Prepared from Maize and Wheat Starches

Protective Effect of Dinitrosyl Iron Complexes Bound with Hemoglobin on Oxidative Modification by Peroxynitrite

Indirekte klassifikation von sechs oximierenden aldehydgruppen in oxycellulose nach dem polymerisationsgrad

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