(c) Briefly explain why it is possible to use the spectrum of the mixture to determine the concentration of cach vitamin in the mixture.

Biochemistry
9th Edition
ISBN:9781319114671
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Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
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You are stumped for a while, because you really don't want to spend all day running columns, and then having to
measure the column fractions with UV-VIS. Your colleague however tells you that it is possible to use the
spectrum of the mixture to determine the concentration of cach vitamin in the mixture.
(c) Briefly explain why it is possible to use the spectrum of the mixture to determine the concentration of each
vitamin in the mixture.
Now that you realise that it is possible, you get some information about the molar absorptivities of cach vitamin
at cach Amax, and list it in Table 1.
Table 1. The molar absorptivities of Vitamins B1 and B6 measured in pure samples of each.
E (M' cm')
a (nm)
Vitamin B1
Vitamin B6
423
5075
240
11280
285
1504
(d)(1) Use the information in Table 1 and the absorbance of the sample mixture at the relevant wavelengths
(Figure 1) to determine the concentration of Vitamin B1 in the diluted, prepared sample.
(d)(i) Determine the mass of Vitamin B1 in one of the vitamin tablets. (MW Vitamin B1: 300.81)
(e) Sketch a diagram of the double-beam scanning spectrophotometer that you would have used to generate
the spectra in Figure 1.
Transcribed Image Text:You are stumped for a while, because you really don't want to spend all day running columns, and then having to measure the column fractions with UV-VIS. Your colleague however tells you that it is possible to use the spectrum of the mixture to determine the concentration of cach vitamin in the mixture. (c) Briefly explain why it is possible to use the spectrum of the mixture to determine the concentration of each vitamin in the mixture. Now that you realise that it is possible, you get some information about the molar absorptivities of cach vitamin at cach Amax, and list it in Table 1. Table 1. The molar absorptivities of Vitamins B1 and B6 measured in pure samples of each. E (M' cm') a (nm) Vitamin B1 Vitamin B6 423 5075 240 11280 285 1504 (d)(1) Use the information in Table 1 and the absorbance of the sample mixture at the relevant wavelengths (Figure 1) to determine the concentration of Vitamin B1 in the diluted, prepared sample. (d)(i) Determine the mass of Vitamin B1 in one of the vitamin tablets. (MW Vitamin B1: 300.81) (e) Sketch a diagram of the double-beam scanning spectrophotometer that you would have used to generate the spectra in Figure 1.
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