(a) In an experiment to determine the glycine concentration of test sample A, the Ninhydrin method was used and the absorbance data in Table 1 was generated. Table 1: Absorbance data generated @ Amax for glycine standards (0-0.1mM) and test sample A. Tube Number Standard (mM)/Test sample A 1 0 2 0.025 3 0.05 4 0.075 0.1 (i) (ii) 5 Absorbance @575nm 6 7 8 0 0.126 0.231 0.355 0.479 0.723 0.357 0.143 Test sample A (undiluted) Test sample A (2-fold dilution) Test sample A (5-fold dilution) Using the data in Table 1 estimate the amino acid concentration of test sample A. Given the true value of test sample A is 0.15mM, comment on the accuracy and precision of the experimernal data. (iii) Describe the principle of the Ninhydrin method for quantitation of amino acids.

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(a) In an experiment to determine the glycine concentration of test sample A, the Ninhydrin method
was used and the absorbance data in Table 1 was generated.
Table 1: Absorbance data generated @ Amax for glycine standards (0-0.1mM) and test sample
A.
Tube Number Standard (mM)/ Test sample A
0
0.025
0.05
0.075
0.1
Test sample A (undiluted)
e
(1)
(ii)
1
2
3
4
5
6
7
8
Test sample A (2-fold dilution)
Test sample A (5-fold dilution)
Absorbance @575nm
0
0.126
0.231
0.355
0.479
0.723
0.357
0.143
Using the data in Table 1 estimate the amino acid concentration of test sample A.
Given the true value of test sample A is 0.15mM, comment on the accuracy and
precision of the experimental data.
Describe the principle of the Ninhydrin method for quantitation of amino acids.
Transcribed Image Text:(a) In an experiment to determine the glycine concentration of test sample A, the Ninhydrin method was used and the absorbance data in Table 1 was generated. Table 1: Absorbance data generated @ Amax for glycine standards (0-0.1mM) and test sample A. Tube Number Standard (mM)/ Test sample A 0 0.025 0.05 0.075 0.1 Test sample A (undiluted) e (1) (ii) 1 2 3 4 5 6 7 8 Test sample A (2-fold dilution) Test sample A (5-fold dilution) Absorbance @575nm 0 0.126 0.231 0.355 0.479 0.723 0.357 0.143 Using the data in Table 1 estimate the amino acid concentration of test sample A. Given the true value of test sample A is 0.15mM, comment on the accuracy and precision of the experimental data. Describe the principle of the Ninhydrin method for quantitation of amino acids.
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