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Topic: Maltose


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In the News (Tue 10 Nov 09)

  
  Carbohydrates - Maltose
Maltose or malt sugar is the least common disaccharide in nature.
It is present in germinating grain, in a small proportion in corn syrup, and forms on the partial hydrolysis of starch.
At the point when the maximum starch content is reached, the seed growth is stopped by heating the grain to a temperature that stops growth but allows an important natural enzyme diastase to remain active.
www.elmhurst.edu /~chm/vchembook/546maltose.html   (416 words)

  
 maltose. The Columbia Encyclopedia, Sixth Edition. 2001-05
Maltose is produced from starch by hydrolysis in the presence of diastase, an enzyme present in malt.
Maltose is hydrolyzed to glucose by maltase, an enzyme present in yeast; the glucose thus formed may be fermented by another enzyme in yeast to produce ethanol.
Maltose is important in the brewing of beer.
www.bartleby.com /65/ma/maltose.html   (127 words)

  
 [No title]   (Site not responding. Last check: 2007-11-03)
Maltose is also commercially important in the brewing industry, wherein it is provided as a fermentable component of brewing worts.
The maltose may be readily separated from the product mixture thus formed via ultrafiltration'to yield a high-purity maltose product in which the maltose content is greater than 70% based upon total carbohydrate and in which the combined content of glucose and oligosaccharides having a DP ranging from 3-10 is below 10%.
Such a correlation between reaction time and maltose content may be determined empirically, for instance, by performing at least two experiments in which the enzyme is quenched at different reaction times each less than the optimum reaction time, and measuring the maltose content in each case.
www.wipo.int /cgi-pct/guest/getbykey5?KEY=01/64934.010907&ELEMENT_SET=DECL   (5391 words)

  
 Metabolic Signals Trigger Glucose-Induced Inactivation of Maltose Permease in Saccharomyces -- Jiang et al. 182 (3): ...   (Site not responding. Last check: 2007-11-03)
Maltose permease is required for maltose transport and MAL gene induction (6, 7).
2, in glucose sensing by pathway 2 in the inactivation of maltose
Characterization of the glucose-induced inactivation of maltose permease in Saccharomyces cerevisiae.
jb.asm.org /cgi/content/full/182/3/647   (4119 words)

  
 Analysis of the Mechanism by Which Glucose Inhibits Maltose Induction of MAL Gene Expression in Saccharomyces -- Hu et ...   (Site not responding. Last check: 2007-11-03)
in Saccharomyces cerevisiae is induced by maltose and repressed
Glucose-induced inactivation of maltose permease in hxk2 mutant strains.
of glucose inhibition of maltose induction in the gsf1-1 strain.
www.genetics.org /cgi/content/full/154/1/121   (4952 words)

  
 Intracellular Maltose Is Sufficient To Induce MAL Gene Expression in Saccharomyces cerevisiae -- Wang et al. 1 (5): 696 ...   (Site not responding. Last check: 2007-11-03)
Intracellular Maltose Is Sufficient To Induce MAL Gene Expression in Saccharomyces cerevisiae -- Wang et al.
Intracellular Maltose Is Sufficient To Induce MAL Gene Expression in Saccharomyces cerevisiae
maltose permease in maltose sensing by substituting a heterologous
ec.asm.org /cgi/content/abstract/1/5/696   (385 words)

  
 Maltose
Maltose, the disaccharide obtained by enzyme-catalyzed hydrolysis of starch, consists of two D-glucopyranoses joined by a 1,4'-beta-glycoside bond.
Both maltose and cellobiose are reducing sugars because the anomeric carbons on the right-hand sugar are part of a hemiacetal.
Maltose, however, is digested without difficulty and is fermented readily.
www.3dchem.com /molecules.asp?ID=57   (157 words)

  
 Genetic Evidence That High Noninduced Maltase and Maltose Permease Activities, Governed by MALx3-Encoded ...   (Site not responding. Last check: 2007-11-03)
Maltose transport activity was assayed according to the method of Serrano (38).
Higher noninduced levels of maltase and maltose permease increase the ability of a yeast strain to produce CO in unsugared dough.
Constitutive expression of the maltose fermentative enzymes in Saccharomyces carlsbergensis is dependent upon the mutational activation of a nonessential homolog of MAL63.
aem.asm.org /cgi/content/full/65/2/680   (3776 words)

  
 Trehalose synthase of Mycobacterium smegmatis: Purification, cloning, expression, and properties of the enzyme -- Pan ...   (Site not responding. Last check: 2007-11-03)
of 1 nmole of trehalose to maltose in 1 min.
to trehalose and trehalose to maltose with 50% inhibition of
maltose in the absence or in the presence of 10 or
content.febsjournal.org /cgi/content/full/271/21/4259   (5508 words)

  
 Realbeer.com Beer Community - Anhoser-Boob & maltose
Maltose is the main sugar, along with maltotriose, that the yeast consume during fermentation.
Maltose (sugar) is converted to alcohol and CO2 during fermentation.
Maltose, is 100% fermentable there is no maltose in most beers.
www.realbeer.com /discussions/showthread.php?s=5ba7d1781e3bf7346dbccc7e7723da91&threadid=3381   (838 words)

  
 Maltose information page. All about maltose and the role it plays in your diet.
Maltose, also called malt sugar, is not found free in nature, but is formed by enzymes or acid hydrolysis from starch.
On hydrolysis of maltose, two molecules of glucose is formed and are an intermediate product are the digestion of starch.
It is easily used by the body, and is sometimes used, together with dextrin, a polysaccharide, in infant formulas.
www.anyvitamins.com /maltose-info.htm   (180 words)

  
 Maltose/Maltodextrin System of Escherichia coli: Transport, Metabolism, and Regulation -- Boos and Shuman 62 (1): 204 ...   (Site not responding. Last check: 2007-11-03)
After transport of maltose by the binding protein-dependent ABC transporter, a maltosyl, maltotriosyl, or maltotetraosyl (and so on) residue is transferred from maltotriose, maltotetraose, or maltopentaose (and so on) onto the incoming maltose releasing glucose in the process.
This scheme demonstrates that maltose degradation by the maltose enzymes requires the endogenous presence of a maltodextrin primer with the minimal size of maltotriose.
substrate is maltotriose; maltose is not a substrate.
mmbr.asm.org /cgi/content/full/62/1/204   (10581 words)

  
 Residues in the {alpha} helix 7 of the bacterial maltose binding protein which are important in interactions with the ...   (Site not responding. Last check: 2007-11-03)
Residues in the {alpha} helix 7 of the bacterial maltose binding protein which are important in interactions with the Mal FGK(2) complex -- SZMELCMAN et al.
Residues in the {alpha} helix 7 of the bacterial maltose binding protein which are important in interactions with the Mal FGK(2) complex
maltose transport and in chemotaxis towards this sugar.
www.proteinscience.org /cgi/content/abstract/6/3/628   (431 words)

  
 Daylength effects on starch degradation rate and maltose metabolism
Inhibition of maltose export or metabolism results in a 20 to 90-fold increase in maltose content of leaves and a dwarf phenotype.
When plants were put into darkness in the middle of their physiological light period they accumulated very small levels of maltose but in darkness during their normal dark period they accumulated 2 to 4 times the amount of maltose found in the light.
Maltose is metabolized by cytosolic amylomaltase and starch phosphorylase (poster xxx).
abstracts.aspb.org /pb2004/public/M15/9019.html   (401 words)

  
 Maltose Metabolism in the Hyperthermophilic Archaeon Thermococcus litoralis: Purification and Characterization of Key ...
Maltose Metabolism in the Hyperthermophilic Archaeon Thermococcus litoralis: Purification and Characterization of Key Enzymes -- Xavier et al.
Maltose metabolism was investigated in the hyperthermophilic archaeon Thermococcus litoralis.
The enzyme was eluted with 20 mM maltose or maltotriose in the
jb.asm.org /cgi/content/full/181/11/3358   (5834 words)

  
 Headlines@Hopkins: Johns Hopkins University News Releases
Maltose binding protein binds to a type of sugar called maltose that the E.
To do this, they snipped the maltose binding genes, using enzymes that act like molecular scissors to cut the genes as though they were tiny strips of paper.
Because the pieces were cut and reassembled at different locations along the maltose binding gene, the combined genes produced new proteins with different characteristics.
www.jhu.edu /news_info/news/home03/mar03/molecule.html   (827 words)

  
 Maltose Binding Protein
Maltose Binding Protein (MBP) is a part of the maltose/maltodextrin system of Eschericia coli bacteria, which is responsible for the uptake and efficient catabolism of maltodextrins.
Location of "dominant-negative" and "suppressor" mutation sites on the structure of closed, ligand-bound MBP; maltose is shown in a ball and stick represen-tation.
The direction and magnitude of the conformational change when going from the unliganded to the ligand-bound form are shown.
www.che.utoledo.edu /nadarajah/webpages/mbp.htm   (484 words)

  
 High-Affinity Maltose Binding and Transport by the Thermophilic Anaerobe Thermoanaerobacter ethanolicus 39E -- Jones et ...   (Site not responding. Last check: 2007-11-03)
Maltose transport systems in mesophilic bacteria have been widely studied (2), and several systems in thermophiles have
Maltose and glucose concentrations in culture medium were determined enzymatically as previously described (13).
maltose being cleaved to glucose by extracellular enzymes and
aem.asm.org /cgi/content/full/66/3/995   (4161 words)

  
 Maltose-Induced Hyponatremia -- Palevsky et al. 118 (7): 526 -- Annals of Internal Medicine   (Site not responding. Last check: 2007-11-03)
The serum maltose concentration was measured as the increment
Serum sodium (top panel), osmolal gap (middle panel), and serum maltose (bottom panel) concentrations before (pre-IVIG), during the final 4 hours of (end-IVIG), and 6 to 12 hours after the completion of (post-IVIG) infusions of intravenous immune globulin (IVIG) in 10% maltose in a patient with acute renal failure.
Linear regression of the serum sodium concentration in relation to serum maltose concentrations (Panel A) and the osmolal gap (Panel B), before, during, and after repeated infusions of intravenous immune globulin in 10% maltose in a patient with acute renal failure.
www.annals.org /cgi/content/full/118/7/526   (1046 words)

  
 ARS | Publication request: FLUORINATED CELLOBIOSE AND MALTOSE AS STAND-INS FOR ENERGY SURFACE CALCULATIONS   (Site not responding. Last check: 2007-11-03)
It was quite predictive of structures for the cellulose that could be observed under ideal conditions, but not as predictive for maltose structures.
The apparent mean strength of an intra molecular, inter-residue hydrogen bond is about 3 kcal/mol, based on the energy for many of the hydrogen bonded maltose structures on the F-maltose map.
The F-maltose map was similar to one for an analog of maltose in which all hydroxyl groups were replaced with hydrogen atoms.
www.ars.usda.gov /research/publications/Publications.htm?seq_no_115=172746   (463 words)

  
 {beta}-Amylase Induction and the Protective Role of Maltose during Temperature Shock -- Kaplan and Guy 135 (3): 1674 -- ...   (Site not responding. Last check: 2007-11-03)
a mutation in a single-copy maltose translocator gene (Niittyla
Lu Y, Sharkey TD (2004) The role of amylomaltase in maltose metabolism in the cytosol of photosynthetic cells.
Sean EW, Weber APM, Sharkey TD (2004) Maltose is the major form of carbon exported from the chloroplast at night.
www.plantphysiol.org /cgi/content/full/135/3/1674   (5823 words)

  
 Genetic localization and regulation of the maltose phosphorylase gene, malP, in Lactococcus lactis -- Nilsson and ...   (Site not responding. Last check: 2007-11-03)
(c) Cell extract from a parent culture grown on maltose was loaded in lane 2, and cell extracts from maltose-grown cells were loaded in lanes 3–5.
Bunte, A. Genes and enzymes involved in maltose metabolism in Lactococcus lactis.
Ehrmann, M. and Vogel, R. Maltose metabolism of Lactobacillus sanfranciscensis: cloning and heterologous expression of the key enzymes, maltose phosphorylase and phosphoglucomutase.
mic.sgmjournals.org /cgi/content/full/147/6/1565   (4130 words)

  
 {beta}-Maltose Is the Metabolically Active Anomer of Maltose during Transitory Starch Degradation -- Weise et al. 137 ...   (Site not responding. Last check: 2007-11-03)
Maltose is the major form of carbon exported from the chloroplast
Maltose was extracted from leaf punches taken in the middle
Weise SE, Weber A, Sharkey TD (2004) Maltose is the major form of carbon exported from the chloroplast at night.
www.plantphysiol.org /cgi/content/full/137/2/756   (3445 words)

  
 Oxidation of exogenous glucose, sucrose, and maltose during prolonged cycling exercise -- Jentjens et al. 96 (4): 1285 ...   (Site not responding. Last check: 2007-11-03)
Oxidation of exogenous glucose, sucrose, and maltose during prolonged cycling exercise -- Jentjens et al.
CHO absorption rates of glucose and maltose may be similar.
Exogenous carbohydrate oxidation from maltose and glucose ingested during prolonged exercise.
jap.physiology.org /cgi/content/full/96/4/1285   (4474 words)

  
 Periplasmic maltose- and glucose-binding protein activities in cell-free extracts of Thermotoga maritima -- Nanavati et ...   (Site not responding. Last check: 2007-11-03)
Periplasmic maltose- and glucose-binding protein activities in cell-free extracts of Thermotoga maritima -- Nanavati et al.
Periplasmic maltose- and glucose-binding protein activities in cell-free extracts of Thermotoga maritima
Jones, C. R., Ray, M., Dawson, K. and Strobel, H. High-affinity maltose binding and transport by the thermophilic anaerobe Thermoanaerobacter ethanolicus 39E.
mic.sgmjournals.org /cgi/content/full/148/11/3531   (2914 words)

  
 Important Drug-Devise Safety Alert - Maltose, Galactose, Oral Xylose
The GDH-PQQ method of glucose determination is non-specific for glucose and, in the presence of maltose, xylose, or galactose, may yield falsely elevated glucose readings.
Review the labeling for both the glucose meter and the test strips to be used to monitor glucose levels to determine what type of method is used for glucose determination.
Preliminary calculations suggest that, when WinRho SDF Liquid is administered at the recommended doses, the peak blood concentration of maltose is unlikely to interfere with glucose testing by GDH-PQQ-based methods.
www.fda.gov /cber/safety/maltose110405.htm   (546 words)

  
 Production of syrups containing maltose
Traditionally, syrups containing maltose as a major component have been produced by treating barley starch with barley
High-maltose syrups (40 - 50 DE, 45-60% (w/w) maltose, 2 - 7% (w/w) glucose) tend not to crystallise, even below 0°C and are relatively non-hygroscopic.
High conversion syrups (60 - 70 DE, 30 - 37% maltose, 35 - 43% glucose, 10% maltotriose, 15% other oligosaccharides, all by weight) resist crystallisation above 4°C and are sweeter (Table 4.3).
www.lsbu.ac.uk /biology/enztech/maltose.html   (412 words)

  
 Truncation of MalF Results in Lactose Transport via the Maltose Transport System of Escherichia coli -- Merino and ...   (Site not responding. Last check: 2007-11-03)
The active accumulation of maltose and maltodextrins by Escherichia coli is dependent on the maltose transport system.
Mutants of MalF have been isolated that alter the range of substrates transported by the maltose transport system (22).
The ability of the amber mutants to utilize maltose as a sole carbon source was assayed by observing growth on minimal maltose
www.jbc.org /cgi/content/full/273/4/2435   (5733 words)

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