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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 26 (1978), S. 372-375 
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food quality 4 (1981), S. 0 
    ISSN: 1745-4557
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: A titrimetric method for determining cinnamaldehyde has been developed; it is based on the quantitative reaction of the aldehyde with semicarbazide hydrochloride to form the semicarbazone. The semicarbazone is removed and the excess unreacted semicarbazide determined iodometrically using chloramine-T reagent. Two moles of chloramine-T are required per mole of the semicarbazide. The method has been used in the routine quality evaluation of cinnamon oils and the samples required are about 0.02 g for bark oils and 0.05 g for leaf oils.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 60 (1972), S. 818-822 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Sinalbin (Sinapin-p-hydroxybenzylglucosinolat) ist ein Inhaltsstoff des Samens von weißem Senf (Sinapis alba) und bildet bei enzymatischer Hydrolyse eine scharf schmeckende, würzig riechende Verbindung, p-Hydroxybenzyl-isothiocyanat (p-HBI). Ein neues kolorimetrisches Verfahren wurde entwickelt, das auf der Reaktion von p-HBI mit Natronlauge beruht, wobei p-Hydroxybenzylalkohol und NaCNS entstehen. Dieses wird mit Brom zu Bromcyan umgesetzt, das seinerseits mit Pyridin-Benzidin eine Rotfärbung mit dem Absorptionsmaximum bei 518 nm gibt. Die Lösung dieser roten Komplexverbindung folgt dem Beer'schen Gesetz von 0,1–0,5 μg SCN−/ml. Ein Mol Sinalbin entspricht einem Grammion Thiocyanat. Die Ausbeute beträgt etwa 90%.
    Notes: Summary Sinalbin (Sinapinp-hydroxybenzylglucosinolate) is present in white mustard seed(sinapis alba) and on enzymatic hydrolysis liberates a sharp, hot, pungent and flavoury compound,p-hydroxybenzyl isothiocyanate (p-HBI). A new sensitive colorimetric method has been developed in which thep-HBI is reacted with sodium hydroxide to givep-hydroxybenzyl alcohol and sodium thiocyanate. The thiocyanate is converted into cyanogen bromide by reacting it with bromine. The cyanogen bromide is then treated with pyridine—benzidine reagent to give a red colour which has an absorption maximum at 518 nm. The red complex solution obeys Beer's law over the concentration range 0.1–0.5 μg of SCN per ml of the solution. One mole of sinalbin gives rise to one mole of thiocyanate ion. Recovery is ∼90%.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 65 (1976), S. 11-15 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Methylsalicylat ist ein natürlicher Bestandteil in schwarzem Tee; für dessen Bestimmung wurde eine Methode ausgearbeitet. Sie beruht auf der Extraktion der Teeblätter mit heißemn-Hexan; das Lösungsmittel wird dann abdestilliert und der harzartige Rückstand einer Wasserdampfdestillation unterzogen, um das flüchtige Öl zu gewinnen. Dieses wird gaschromatographisch unter Verwendung geeigneter Standardproben analysiert. Der Einfluß von Methylsalicylat auf das Aroma wurde besprochen.
    Notes: Summary Methyl salicylate is a naturally occurring compound in black tea. A method has been developed for the determination of the methyl salicylate in tea samples. The method consists of hot extraction of the teas withn-hexane, distilling off the solvent and steam distillation of the resinous mass to obtain the volatile oil. This oil was analysed gas chromatographically using suitable standards. The effect of methyl salicylate on the overall flavour quality is also reported.
    Type of Medium: Electronic Resource
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