By Harold H Trimm
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Extra resources for Analytical chemistry : methods and applications
MLW type thermostatically controlled water bath (Memmert GmbH, Co. Schwa bach, Germany). Biofuge Pico centrifuge (Heraeus Instruments, Germany). 25%. , Abo-Zaabal, Egypt). Potassium borohydride (Sigma-Aldrich Chemie GmbH, Steinheim, Germany). Adamine capsules (Rameda Co. for Pharmaceutical Industries & Diagnostic Reagents, Cairo, Egypt) are labeled to contain 100 mg of AMD per capsule. Human plasma samples were collected from normal healthy volunteer at King Khaled University Hospital (Riyadh, Kingdom of Saudi Arabia), and they were stored at −20°C until analysis.
The mass error (observed mass versus calculated mass of the hydrolysis fragments) is shown for each proposed structure for Unknown 2. 7 ppm. Thus, the accurate mass data collected for the acid hydrolysis fragments allowed for elimination of the bis-sulfoxide as a potential structure for Unknown 2. Table 5. Mass error analysis of the observed accurate mass for fragments generated by the acid hydrolysis of the enriched impurity fraction. The analysis is conducted for both the thioether and bis-sulfoxide structures proposed for Unknown 2.
The precision of the proposed methods at three concentration levels of AMD. Table 4. Recovery studies for the proposed spectrofluorometric method for the determination of AMD in spiked human plasma. 72%. This 58 Analytical Chemistry: Methods and Applications indicated the absence of interferences from these excipients. Moreover, the interferences from the amino acids with the assay procedures were also studied using glycine as an example for the amino acids. The results of this study revealed that the amino acids could interfere with the spectrophotometric procedures.