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  • 1
    Digitale Medien
    Digitale Medien
    s.l. : American Chemical Society
    Journal of natural products 48 (1985), S. 993-993 
    ISSN: 1520-6025
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food quality 18 (1995), S. 0 
    ISSN: 1745-4557
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Dietary fiber in ready salted potato crisps was determined by two methods, i.e., the official AOAC method, and the modified method of Englyst, recommended in the U. K. The ultimate aim was to compare the results and to evaluate the advantages and limitations of each method for the analysis of this food in order to obtain a figure to be included on the package. The AOAC method is an enzymatic-gravimetric procedure to determine the total dietary fiber (TDF). The Englyst method consists of an enzymatic-chemical extraction and fractionation of the nonstarch polysaccharides (NSP) and their subsequent determination as neutral sugars by GLC. We modified the original chromatographic method. The AOAC method gave a value of 5.39 g/100g (dry matter) for TDF, and the Englyst method of a value of 1.70 g/100g (dry matter) for NSP. It is assumed that the gravimetric method gives a higher fiber value than the Englyst method due to a contribution from retrograded starch. For this particular food, the AOAC method is faster and much easier to carry out and does not overestimate dietary fiber, if the resistant starch is regarded as part of it.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 39 (1991), S. 524-530 
    ISSN: 1520-5118
    Quelle: ACS Legacy Archives
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 42 (1994), S. 1543-1545 
    ISSN: 1520-5118
    Quelle: ACS Legacy Archives
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Springer
    Zeitschrift für Lebensmittel-Untersuchung und -Forschung 206 (1998), S. 48-51 
    ISSN: 1431-4630
    Schlagwort(e): Key words Carbohydrates ; Myo-inositol ; Orange juice quality ; Gas chromatography
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Abstract  A gas chromatographic method using a capillary column is described for the quantitative analysis of fructose, glucose, sucrose and myo-inositol in orange juice. The method is evaluated for precision and recovery using phenyl-β-glucoside as an internal standard. The results support the suitability of the method. Carbohydrates (fructose, glucose, sucrose and myo-inositol) were determined in different kinds of orange juice. The determination of carbohydrate composition and ratios of the carbohydrate constituents provide a method to assess orange juice quality, especially the myo-inositol content and myo-inositol/fructose ratio. These new indices, which were found to be lower in samples made from concentrates, provide information on the quality and genuineness of orange juice.
    Materialart: Digitale Medien
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  • 6
    ISSN: 1438-2385
    Schlagwort(e): Lactococci ; Proteolysis ; Flavour development ; Cheese-curd slurries
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Abstract This study describes the accelerating effect exerted on proteolysis and flavour development in cheese-curd slurries by combined application ofLactococcus lactis subsp.lactis IFPL359 and high concentrations of its Lac− Prt− derivative, (i.e. that which has reduced capacity to metabolize lactose and reduced proteolytic activity, strain T1). Cells of strain T1 partially lysed by either sonication or incubation with lysozyme, were also used to ascertain how proteolysis was affected by release of intracellular enzymes in the initial stage of incubation of the strains in cheese-curd slurries. The presence of strain T1 produced higher levels of non-protein nitrogen (NPN) and amine nitrogen (AN) during the first weeks of incubation when partially lysed cells had been added. Addition of whole cells of strain T1 produced higher values of NPN and AN at the end of incubation of slurries, accelerating proteolysis by about 2 weeks with respect to the control, which only contained the parental strain IFPL359. At the end of the experimental period higher amino acid levels were detected by HPLC in the slurry containing whole T1 cells. Volatile fractions of the different cheese-curd slurries were also analysed. The higher level of proteolysis produced by addition of high levels of strain T1 appeared to be related to release of intracellular enzymes by this strain owing to its greater capacity for autolysis.
    Materialart: Digitale Medien
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  • 7
    ISSN: 1438-2385
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Beschreibung / Inhaltsverzeichnis: Summary “Acid-stable, heat-stable polypeptides” (previously called proteose-peptone) of three milk species have been studied. Analysis by polyacrylamide gel electrophoresis revealed that all fractions showed similar patterns. Only bands with the lowest mobilities showed the presence of carbohydrates when stained with Schiffs reagent. These bands had a lower mobility in ewe's and goat's milk than in cow's milk. Gas chromatography/mass spectrometry analysis showed the presence of fucose, mannose, glucose, galactose, glucosamine and galactosamine in the three fractions studied. Acid-stable, heat-stable polypeptides of bovine milk had the lowest carbohydrate content (4 mg/100 mg protein), whereas the highest content was found in ewe's milk (7.30 mg/100 mg protein) mainly as a result of the high galactose, mannose and glucosamine content. The sialic acid content was lower in ewe's and goat's milk (2.68 and 2.98 mg/ 100 mg protein respectively) than in bovine milk (2.06 mg/100 mg protein).
    Notizen: Zusammenfassung Säure- und hitzestabile Polypeptide, früher Proteose-Peptone genannt, von drei Milchsorten wurden untersucht, wobei sich durch Polyacrylamid-Gelelektrophorese ergab, daß alle Fraktionen gleichartig waren. Nur die Banden mit der niedrigsten Mobilität zeigten das Vorhandensein von Kohlenhydraten an, wenn sie mit Schiffs-Reagens behandelt wurden. Diese Banden hatten geringere Mobilität in Schaf- und Ziegenmilch als in Kuhmilch. Analysen mit Gaschromatographie/Massenspektrometrie wiesen auf das Vorhandensein von Fucose, Mannose, Glucose, Galaktose, Glucosamin und Galaktosamin in den drei untersuchten Fraktionen hin. Die säureund hitzebeständige Fraktion der Kuhmilch hatte den niedrigsten Gehalt an Kohlenhydrat: 4,0 mg/100 mg Protein, während der Höchstgehalt in Schafmilch gefunden wurde (7,3 mg/100 mg Protein), hauptsächlich bedingt durch den hohen Gehalt an Galaktose, Mannose und Glucosamin. Der Gehalt an Sialinsäuren ist mit 2,06 mg/100 mg Protein in Kuhmilch niedriger als in Schaf- und Ziegenmilch, die 2,68 mg bzw. 2,98 mg/100 mg Protein enthielten.
    Materialart: Digitale Medien
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  • 8
    ISSN: 1438-2385
    Schlagwort(e): Continuous flow microwave treatment ; Cows' milk ; Goats' milk ; Milk pasteurization
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Abstract Raw cows' and goats' milks were heated by microwave in a continuous flow unit up to temperatures ranging from 73.1 to 96.7°C. The effects of the heat treatments were estimated by measurements of lactose isomerization, protein denaturation, inactivation of alkaline phosphatase and peroxidase and the total bacterial count. Negative phosphatase tests and low bacterial counts, together with low degrees of whey protein denaturation, were achieved under several temperature/time combinations. The results indicate that continuous microwave processing may be an efficient and mild approach for the pasteurization of milk.
    Materialart: Digitale Medien
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  • 9
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 21 (1998), S. 225-233 
    ISSN: 0935-6304
    Schlagwort(e): Chiral GC ; chiral stationary phase ; cyclodextrin ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---2,3-Di-O-pentyl-6-O-tert-butyldimethylsilyl-β-cyclodextrin has been evaluated as an enantioselective stationary phase for capillary gas chromatography. Experimental results show a good enantioselectivity towards compounds with different functional groups (haloalkanes, alcohols, esters, terpenoids, amino acid derivatives, and heterocycles). Column stability improves mixing the chiral phase with polysiloxane SE-54 (1 : 1).
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Chichester : Wiley-Blackwell
    Journal of Chemical Technology AND Biotechnology 65 (1996), S. 111-114 
    ISSN: 0268-2575
    Schlagwort(e): lactose ; lactulose ; monosaccharides ; sepiolite ; isomerization ; Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Sepiolite (a hydrated magnesium silicate) was investigated as a catalyst for the isomerization of lactose. Factors such as temperature, concentration and time were studied. The main reaction product was lactulose; small amounts of epilactose, galactose, tagatose and 3-deoxypentulose were also formed. Product distribution indicated that the reaction routes were isomerization of the disaccharide followed by degradation of lactulose.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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