A processed lemon juice is stored at 4 oC and 10 oC in order to compare storage stability. For ascorbic acid degradation, rate constant (day-1) can be expressed as k=A.e-25000/RT. If the ascorbic acid degradation rate constant is 2.587x10-3 day-1 at 5 oC; Calculate ascorbic acid degradation rate constants at 4 and 10 oC, Determine ascorbic acid degradation order and derive shelf-life equation for degradation order, Calculate shelf-life values of ascorbic acid at 4 and 10 oC and compare those

A processed lemon juice is stored at 4 oC and 10 oC in order to compare storage stability. For ascorbic acid degradation, rate constant (day-1) can be expressed as k=A.e-25000/RT. If the ascorbic acid degradation rate constant is 2.587x10-3 day-1 at 5 oC; Calculate ascorbic acid degradation rate constants at 4 and 10 oC, Determine ascorbic acid degradation order and derive shelf-life equation for degradation order, Calculate shelf-life values of ascorbic acid at 4 and 10 oC and compare those

Introduction to General, Organic and Biochemistry

11th Edition

ISBN:9781285869759

Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres

Publisher:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres

Chapter31: Immunochemistry

Section: Chapter Questions

Problem 31.20P: Chemical Connections 20D states that the antigen in the red blood cells of a person with B-type...

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Determine the branch points and reducing ends of amylopectin. A 0.5g sample of amylopectin was analyzed to determine the fraction of the total glucose residues that are branch points in the structure. The sample was methylated and then digested, yielding 50 μmol of 2,3-methylglucose and 0.4 μmol of 1,2,3,6-tetramethyl glucose. (MWglucose = 162 g/mol, minus H2O) What fraction of the total residues are branch points? How many reducing ends does the amylopectin have?
Contrast the structure of glycogen and chitin. Drag the appropriate items to their respective rows. Glycogen Chitin Monomers connect by B-1,4-glycosidic linkages Monomers connect by alpha-1,4-glycosidic linkages Polymers interact with one another via hydrogen bonds Consists of modified glucose residues (NAG) Contains branches arising from alpha-1,6-glycosidic linkages Consists of glucose residues
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Give two examples of external innate immunity in humans.
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When some sugars dissolve in water they spontaneously undergo changes in optical rotation called mutarrotation. The Mutarrotation of D-glucopyranose is catalyzed by acid and bases. 2-Hydroxypyridine is a more effective catalyst than phenol and pyridine for this reaction because: a.Both oxygen and N in 2-hydroxypyridine act as bases increasing the rapid interconversion of sugar b. The OH of 2-hydroxypyridine serves as the base while the current N as the acid. c. 2-hydroxypyridine acts both as a base to remove the proton from the hydroxyl group in the hemiacetal and as an acid to provide a proton to the oxygen in the hemiacetal. d.Phenol and pyridine are very expensive.
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C6H12O6 + a*O2 + b*NH3 --> c*CH1.64O0.52N0.16 + d*CO2 + e*H2O + f*C2H5OH In the aerobic yeast growth process, overflow metabolism can be observed when the sugar feed rate exceeds the oxidizing capacity of the yeast. In this case, part of the substrate is treated anaerobically and the production of biomass is reduced and ethanol is formed. This can also be observed when the respiratory rate RQ goes above one. The chemical composition of this yeast is CH1.64O0.52N0.16 . The yield of ethanol from glucose is 0.14 g g-1 and the yield of biomass from glucose is 0.362 g g-1. Calculate the oxygen demand of the reaction. In this calculation, use the following rounded even values as atomic weights for all calculations: C=12 g/mol, H=1 g/mol, O=16 g/mol ja N=14 g/mol. So how many moles of oxygen are needed per mole of glucose?
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