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Glycerol GK Assay Kit

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Glycerol GK Assay Kit K-GCROLGK Scheme
Product code: K-GCROLGK

70 assays (manual) / 700 assays (microplate) / 600 assays (auto-analyser)

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Content: 70 assays (manual) / 700 assays (microplate) / 600 assays (auto-analyser)
Shipping Temperature: Ambient
Storage Temperature: Short term stability: 2-8oC,
Long term stability: See individual component labels
Stability: > 2 years under recommended storage conditions
Analyte: Glycerol
Assay Format: Spectrophotometer, Microplate, Auto-analyser
Detection Method: Absorbance
Wavelength (nm): 340
Signal Response: Increase
Linear Range: 1.0 to 35 µg of glycerol per assay
Limit of Detection: 0.37 mg/L
Reaction Time (min): ~ 7 min
Application examples: Wine (and grape juice), beer, spirits, vinegar, marzipan, fruit juices, soft drinks, toothpaste, honey, tobacco, paper (and cardboard), cosmetics, pharmaceuticals, soap and other materials (e.g. biological cultures, samples, etc.).
Method recognition: Novel method

The Glycerol GK test kit is a simple, reliable and accurate method for the measurement and analysis of glycerol in beverages, foodstuffs and other material. Based on use of ADP-glucokinase and increase in absorbance on conversion of NAD+ to NADH.

Note for Content: The number of manual tests per kit can be doubled if all volumes are halved.  This can be readily accommodated using the MegaQuantTM  Wave Spectrophotometer (D-MQWAVE).

Explore our complete range of alcohol assay kit products.

  • Extended cofactors stability. Dissolved cofactors stable for > 1 year at 4oC.
  • Novel tablet format for increased stability 
  • Very competitive price (cost per test) 
  • All reagents stable for > 2 years as supplied 
  • Very rapid reaction 
  • Positive reaction (assay proceeds with an increase in absorbance) 
  • Mega-Calc™ software tool is available from our website for hassle-free raw data processing 
  • Standard included 
  • Suitable for manual, microplate and auto-analyser formats
Certificate of Analysis
Safety Data Sheet
FAQs Booklet Data Calculator
An accurate description of Aspergillus niger organic acid batch fermentation through dynamic metabolic modelling.

Upton, D. J., McQueen-Mason, S. J. & Wood, A. J. (2017). Biotechnology for Biofuels, 10(1), 258.

Background: Aspergillus niger fermentation has provided the chief source of industrial citric acid for over 50 years. Traditional strain development of this organism was achieved through random mutagenesis, but advances in genomics have enabled the development of genome-scale metabolic modelling that can be used to make predictive improvements in fermentation performance. The parent citric acid-producing strain of A. niger, ATCC 1015, has been described previously by a genome-scale metabolic model that encapsulates its response to ambient pH. Here, we report the development of a novel double optimisation modelling approach that generates time-dependent citric acid fermentation using dynamic flux balance analysis. Results: The output from this model shows a good match with empirical fermentation data. Our studies suggest that citric acid production commences upon a switch to phosphate-limited growth and this is validated by fitting to empirical data, which confirms the diauxic growth behaviour and the role of phosphate storage as polyphosphate. Conclusions: The calibrated time-course model reflects observed metabolic events and generates reliable in silico data for industrially relevant fermentative time series, and for the behaviour of engineered strains suggesting that our approach can be used as a powerful tool for predictive metabolic engineering.

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Light enhanced calcification in Stylophora pistillata: effects of glucose, glycerol and oxygen.

Holcomb, M., Tambutté, E., Allemand, D. & Tambutté, S. (2014). PeerJ, 2, e375.

Zooxanthellate corals have long been known to calcify faster in the light than in the dark, however the mechanism underlying this process has been uncertain. Here we tested the effects of oxygen under controlled pCO2 conditions and fixed carbon sources on calcification in zooxanthellate and bleached microcolonies of the branching coral Stylophora pistillata. In zooxanthellate microcolonies, oxygen increased dark calcification rates to levels comparable to those measured in the light. However in bleached microcolonies oxygen alone did not enhance calcification, but when combined with a fixed carbon source (glucose or glycerol), calcification increased. Respiration rates increased in response to oxygen with greater increases when oxygen is combined with fixed carbon. ATP content was largely unaffected by treatments, with the exception of glycerol which decreased ATP levels.

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Construction of an efficient xylose-fermenting diploid Saccharomyces cerevisiae strain through mating of two engineered haploid strains capable of xylose assimilation.

Kim, S. R., Lee, K. S., Kong, I. I., Lesmana, A., Lee, W. H., Seo, J. H., Kweon, D. H. & Jin, Y. S. (2013). Journal of Biotechnology, 164(1), 105-111.

Saccharomyces cerevisiae can be engineered for xylose fermentation through introduction of wild type or mutant genes (XYL1/XYL1 (R276H), XYL2, and XYL3) coding for xylose metabolic enzymes from Scheffersomyces stipitis. The resulting engineered strains, however, often yielded undesirable phenotypes such as slow xylose assimilation and xylitol accumulation. In this study, we performed the mating of two engineered strains that exhibit suboptimal xylose-fermenting phenotypes in order to develop an improved xylose-fermenting diploid strain. Specifically, we obtained two engineered haploid strains (YSX3 and SX3). The YSX3 strain consumed xylose rapidly and produced a lot of xylitol. On the contrary, the SX3 strain consumed xylose slowly with little xylitol production. After converting the mating type of SX3 from alpha to a, the resulting strain (SX3-2) was mated with YSX3 to construct a heterozygous diploid strain (KSM). The KSM strain assimilated xylose (0.25 g xylose h-1 g cells-1) as fast as YSX3 and accumulated a small amount of xylitol (0.03 g g xylose-1) as low as SX3, resulting in an improved ethanol yield (0.27 g g xylose-1). We found that the improvement in xylose fermentation by the KSM strain was not because of heterozygosity or genome duplication but because of the complementation of the two xylose-metabolic pathways. This result suggested that mating of suboptimal haploid strains is a promising strategy to develop engineered yeast strains with improved xylose fermenting capability. -1

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Dynamic modeling of methylotrophic Pichia pastoris culture with exhaust gas analysis: From cellular metabolism to process simulation.

Niu, H., Daukandt, M., Rodriguez, C., Fickers, P. & Bogaerts, P. (2013). Chemical Engineering Science, 87, 381-392.

A systematic approach to establish a dynamic model of methylotrophic Pichia pastoris culture in bioreactor is presented on the basis of biomass compartmentalization and metabolic stoichiometry simplification. Besides direct state variables (i.e., biomass, glycerol, methanol, and ammonia), CER and OUR calculated from on-line exhaust gas analysis are included in the model. The model is directly and crossly validated with five experimental cultures involving glycerol growth and methanol feeding phases. Model parameters are identified with confidence intervals. Meanwhile, data consistency is straightforward checked between predicted CERs and measured CTRs. In addition, in the light of the model structure, the results of parameter sensitivity analysis verifies the relative “freedom” of biomass initial compartmentalization and the high output sensitivity when the substrate (glycerol or methanol) concentration is close to the affinity constant (KGly or KMeth). With the proposed model, a process control strategy can be accordingly developed, which is based on real-time monitoring and regulating of cellular metabolic state during culture.

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Construction of self-cloning, indigenous wine strains of Saccharomyces cerevisiae with enhanced glycerol and glutathione production.

Hao, R. Y., Liu, Y. L., Wang, Z. Y. & Zhang, B. R. (2012). Biotechnology Letters, 34(9), 1711-1717.

To improve wine taste and flavor stability, a novel indigenous strain of Saccharomyces cerevisiae with enhanced glycerol and glutathione (GSH) production for winemaking was constructed. ALD6 encoding an aldehyde dehydrogenases of the indigenous yeast was replaced by a GPD1 and CUP1 gene cassette, which are responsible for NAD-dependent glycerol-3-phosphatase dehydrogenase and copper resistance, respectively. Furthermore, the α-acetohydroxyacid synthase gene ILV2 of the indigenous yeast was disrupted by integration of the GSH1 gene which encodes γ-glutamylcysteine synthetase and the CUP1 gene cassette. The fermentation capacity of the recombinant was similar to that of the wild-type strain, with an increase of 21 and 19% in glycerol and GSH production. No heterologous DNA was harbored in the recombinant in this study.

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Safety Information
Symbol : GHS07
Signal Word : Warning
Hazard Statements : H302, H412
Precautionary Statements : P264, P270, P273, P301+P312, P330, P501
Safety Data Sheet
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