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Articles by Chitchamai Ovatlarnporn
Total Records ( 2 ) for Chitchamai Ovatlarnporn
  Kashif-ur-Rehman Khan and Chitchamai Ovatlarnporn
  Hydroxypropyl cellulose (HPC) was selected as a macromolecular carrier for the attachment of para-aminobenzoic acid (PABA) for different pharmaceutical, biomedical and nutritional applications. HPC-PABA ester conjugate was synthesized in a two easy steps that were performed homogeneously. In the first step, the primary amino group of PABA was protected by 98% formic acid and during the second step the protected PABA was coupled with the HPC polymer in DMF by using 4-(dimethylamino)pyridine as a base and N-(3-dimethylaminopropyl)-N-ethylcarbodiimide hydrochloride (EDC.HCl) as a coupling reagent at room temperature. The optimum conditions for deprotection process were also determined. Novel macromolecular conjugate has solubility in both water and organic solvents. HPC-PABA ester conjugate was synthesized with good percentage yield and purity and well identified by FT-IR and 1H-NMR techniques. According to this new synthesis plan HPC-PABA conjugate can be prepared easily and has potential for pharmaceutical, textile and biomedical sectors.
  Sirinporn Nalinbenjapun and Chitchamai Ovatlarnporn
  Background: The p-aminobenzoic acid (PABA) is an essential nutrient and important substrate for folic biosynthesis in human. The PABA deficiency can cause many symptoms and diseases which may related to folic acid insufficiency. In this study, chitosans with three different molecular weights (30, 80 and 300 kDa) were selected as a macromolecule carrier for the attachment of PABA for pharmaceutical and nutritional applications. Materials and Methods: The first step, amino groups of chitosan were substituted by p-nitrobenzoyl moiety resulting in p-nitrobenzoyl-chitosans (1a-c). The PABA-chitosan conjugates (2a-c) were finally obtained by sodium dithionite reduction process. They were characterized for their functional groups by FT-IR and PABA loading capacity by HPLC. Results: The products of the first step (1a-c) were obtained in good yields (82.49-90.67%) with high purity. The PABA-chitosan conjugates (2a-c) were achieved from the second step also in high yields (82.26-91.86%) and purity. The FT-IR results of 2a-c displayed the C=O stretching, amide II deformation of N-H group and the C-O stretching at 1632.58-1638.00, 1550.08-1559.93 and 1036.58-1040.09 cm–1, respectively. The HPLC results demonstrated that PABA can be loaded onto chitosan in a range of 11.07-23.02% according to the MW of chitosans. Conclusion: These PABA-chitosan conjugates are suitable to delivery PABA to the large intestine and colon where the biodegradation process of chitosan and the cleavage of the attached PABA occur. The released PABA can be utilized as a substrate for folic acid synthesis and for the treatment of PABA deficiency syndrome.
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