A sample containing histidine (pKas 1.8, 6.0, 9.3), lysine (pKas 2.2, 9.1, 10.5), and leucine (pKas 2.3, 9.7) at pH 7 is loaded onto an SP-Sepharose resin and then eluted at pH 7 using a gradient of increasing NaCl concentration. What would be the order of elution of the amino acids from the column (first to last)?
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- 1. A mixture of proteins (pepsinogen, myoglobin, and cytochrome c) is subjected to anion exchange chromatography at pH 5.0. In what order would the following proteins be eluted from the DEAE cellulose anion exchanger by an increasing salt gradient: cytochrome c (pl, 10.6), pepsinogen (pl, 1.0) and myoglobin (pl, 6.8)Chemistry the samples mixture of anion,cation and neutral species were analysed by capillary zone electrophoresis (C2E). Using buffer at pH 4 with the injection at anode and the detection at cathode. the electroosmotic flow was greater than the electrophonetic flow. Give your opinion on the seperation if the pH of buffer used is increased to 7what weight of betazole phosphotungstate might be expected in the assay of 0.1550 g sample of betazole hydrochloride containing 98% C5H9N3.2HC? Gravimetric factor = 0.0909
- Proteins A, B, and C have isoelctric points of 8.2, 6.7, and 5.2 respectively. Place proteins A, B, and C in order of increasing volume on a size exclusion column. Then place the proteins in order of probable increasing elution volume in cation exchange chromatography during an increasing salt graditend run at pH 5.pls explain whyWhat will be the effect on resolution if the ionic strength of the buffer initially used as mobile phase for elution in IEC was too high?a. Increaseb. Decreasec. No effectd. indeterminateIn an SDS-PAGE experiment, protein X has an Rf = 0.75, while protein Y has an Rf = 0.30. Which of the following statements are FALSE during the electrophoretic run?I. X has a greater charge-to-mass ratio than Y, since X has a smaller MW.II. X has a lower MW, and thus experiences less friction with the gel matrix.III. X has more hydrophobic groups, thus is in a more linearized state.IV. X is globular, while protein Y is rod-like, thus X has higher mobility.V. X is affected by less magnitude of electric field because of smaller MW.a. I and Vb. II and IVc. II, III, and IVd. I, III, IV, and VIn coulometric karl Fisher water analysis, 25.0 mL of pure “dry” methanol required 4.23 C to generate enough I2 to react with residual H2O in methanol. A suspension of 0.8476 g of finely ground polymeric material in 25.0 mL of the same “dry” methanol required 63.16 C. Find the weight percent of water in the polymer.
- A 5.00-mL sample of blood was treated with trichloroacetic acid to precipitate proteins. After centrifugation, the resulting solution was brought to pH 3 and extracted with two 5-mL portions of methyl isobutyl ketone containing the lead-complexing agent APCD. The extract was aspirated directly into an air/acetylene flame and yielded an absorbance of 0.569 at 283.3 nm. Five-milliliter aliquots of standard solutions containing 0.400 and 0.600 ppm of lead were treated in the same way and yielded absorbances of 0.396 and 0.599. Please calculate the concentration of lead in the sample in ppm.The same polar compound is gas chromatographed on an SE-30 (very nonpolar) column and then on a Carbowax 20M (very polar column). I low will K=cS/cM vary between the two columns?In order to improve the peptide separation by using a HPLC system, trifluoroacetic acid acts as mobile-phase modifier was added during the preparation of mobile phase. The preparation was performed by a postgraduate student as following:“2.851 g trifluoroacetic acid (MW: 114.02 g/mol) was made up to 500 cm3 in a graduated flask. To this solution, 50 cm3 of ethanol was added, and after mixing the mobile phase was placed in the solvent reservoir and pumping was commenced at 1.5 cm3 min-1.”Based on the given preparation procedure, identify THREE mistakes that were made.
- A 5.00-mL sample of blood was treated with trichloroacetic acid to precipitate proteins. After centrifugation, the resulting solution was brought to pH 3 and extracted with two 5-mL portions of methyl isobutyl ketone containing the lead-complexing agent APCD. The extract was aspirated directly into an air/acetylene flame and yielded an absorbance of 0.527 at 283.3 nm. Five-milliliter aliquots of standard solutions containing 0.400 and 0.600 ppm of lead were treated in the same way and yielded absorbances of 0.396 and 0.599. Find the concentration of lead in the sample in ppm assuming that Beer’s law is followed.Look up the pKa values for trimethylamine, dimethylamine, ethylamine, and ammonia. Predict the order of elution of these compounds from a cation-exchange column eluted with a gradient of increasing pH, beginning at pH 7.The relative electrophoretic mobilities of a 30-kDa protein and a 92-kDa protein used as standards on an SDS-polyacrylaide gel are 0.80 and 0.41. What is the apparent mass of a protein having a mobility of 0.62 on ths gel?