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Chapter 26: Q46P (page 750)

The water-soluble vitamins niacinamide (a neutral com- pound), riboflavin (a neutral compound), niacin (an anion), and thiamine (a cation) were separated by micellar electrokinetic chromatography in 15mMborate buffer (pH8.0)with 50mMsodium dodecyl sulphate. The migration times were niacinamide (8.1min), riboflavin (13.0min), niacin (14.3min), and thiamine. What would the order have been in the absence of sodium dodecyl sulphate? Which compound is most soluble in the micelles?

Short Answer

Expert verified

The thiamine is eluted last as it would be the most soluble.

Step by step solution

01

Definition of water soluble vitamin

Vitamin A, D, E and K are fat-soluble vitamins. Water-soluble vitamins are not stored in our body as its excess gets excrete through the urine. Therefore, these vitamins need to be replenished constantly. Vitamin B and C are water-soluble vitamins.

02

Task of soluble vitamin

In the task niacinamide riboflavin, niacin and thiamine were separated by micellar electrokinetic chromatography. We need to state the order in the absence of sodium dodecyl sulphate and determine which compound would be the most soluble in the micelles.

03

Soluble compounds

Niacinamide (neutral)

Riboflavin(neutral)

Niacin (anion)

Thiamine (cation)

Sodium dodecyl sulphate is an anionic surfactant in the absence of the compound we would that be the order: Cation<neutral<anion

Which in our case means: Thiamine < riboflavin =niacinamide<niacin

Consider thiamine to be eluted last as it would be the most soluble.

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Most popular questions from this chapter

Measure the width of theC351- peak at half-height in Figure 26-32 and calculate the plate number. The capillary length to detector was 40.0 cm. Find the plate height.

(a) How can molecular exclusion chromatography be used to measure the molecular mass of a protein?

(b) Which pore size in Figure 26-15 is most suitable for chromatography of molecules with molecular mass near 100 00?

Totarlsulfexperimevt: Inorganic cations can be quantified by passing a salt solution throagh a cation-exchange columan in the OH-form and titruting the relcasod H+with strong base. The moles of OH-titrant equal the equivalenss of catioa charge in solution.

(a) What volume of 0.0231 M NaOH is needed to titrate the eluate when 10.00ml of 0.0458MKNO3,have been loaded on a cation exchange columan in the H+foem?

(b) A 0.2692g sample of unknown salt is dissolved in demonized waler and loasedoato a cation exchange column in the H+form. The columin is rinsed with deionined water and the combincd loading and rinse solutions are titrated with 0.1396M KOH. A volume of 30.64mL is required to reach the endpoint. How many equivalents of cation are in the sample? Find the millieguivalents of cation per gram of sample (meq/g).

(c) The mass of substance containing one cquivalent is called the equivalent mas. If the cation has a +1 charge, the equivalent mass equals the molar mass. If the cation has a +2 charge, the equivalent mass is half the molar mass. What is the equivalent mass of the sample in (b)?

The system in Figure 26-7 can be adapted to produce the strong acid eluent methane sulfonic acid(CH3SO3-H+). For this purpose, the polarity of the electrodes is reversed and the reservoir containsNH4+CH3SO3-. The barrier membrane and the resin bed at the bottom of the figure must both be anion-exchangers loaded withCH3SO3-.Draw this system and write the chemistry that occurs in each part.

(a) The interstitial volume, V0, in Figure 26-15 is the volume at which the curves rise vertically at the left. FindV0for the 25-nm-pore-size column. To the nearest order of magnitude, what is the smallest molecular mass of molecules excluded from this column? (b) What is the molecular mass of molecules eluted at 9.7 mL from the 12.5-nm column? (c)Vmis the volume at which the curves drop vertically at the right. Find the largest molecular mass that can freely enter the 45-nm pores.
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