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OMED0104: You have been provided with a sample that contains a counterfeit mixture of drugs: Analytical Methods and QA/QC Principles Assignment, UOG, UK
| University | University of Greenwich (UOG) |
| Subject | OMED0104: Analytical Methods and QA/QC Principles |
Question 1.
(a) Suggest a typical 2D NMR experiment that can be used for the elucidation of drug-protein interactions. Critically appraise the fundamentals of this technique and with the aid of an example, highlight how results can be monitored.
(b) You have been provided with a sample that contains a counterfeit mixture of drugs. Critically describe, with the aid of a figure, an NMR experiment that can be used to separate and identify the components in this mixture.
Question 2.
(a) Propose an experimental method, using a triple-quadrupole mass spectrometer, for the identification of an unknown drug metabolite observed during phase I clinical testing. Your answer should include:
(i) Consideration of different ionization methods, and the mass spectrometric information generated by them.
(ii) Discussion of the different mass spectrometric scanning modes available, and the information each scanning mode can provide.
(iii) Discussion of the use and limitations of gas chromatography and liquid chromatography as separation methods that supplement mass spectrometry for use with complex analyte matrices.
(b) For the low-resolution electrospray ionization of the nonsteroidal anti-inflammatory drug diclofenac, predict the pseudo-molecular parent ion mass spectrum and isotope distribution, including mass-to-charge ratios of expected peaks, and the calculated relative abundances of any isotope peaks.
Question3.
The following questions are related to chiral separations:
(a) Discuss why pharmaceutical companies care about the chiral purity of their compounds. [8 marks]
(b) Discuss how racemic mixtures are separated. [15 marks]
(c) If you must validate a specific chromatographic methodology, discuss how you evaluate the key validation parameters.
Question4.
(a) Why is the polymorphism of interest in the pharmaceutical industry? Discuss different polymorphic systems(transitions) and explain their physicochemical differences. Provide sketches of their unique DSC traces.
(b) Several experimental parameters may influence the quality of thermogravimetric analysis (TGA) data for a given pharmaceutical molecule. Critically describe the importance of heating rate, carrier gas flow, and type of carrier gas on the obtained results and their quality. Provide examples and graphical explanations to support your answer.
Question5.
(a) What are the key aspects of the analytical method selection process? Provide a detailed explanation and examples to support your answer.
(b) Explain and graphically represent a phase 1a investigation of an OOS result.
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