1.Development and in Vitro Evaluation of Multi/bi-bilayer Tablet Dual-release Formulations of Vildagliptin and Dapagliflozin for the Treatment of Type 2 Diabetes Mellitus
Dr. Md Raihan Sarkar ; Shyamjit Paul ; Farhanul Islam ; Abu Zafar Md. Marufur Rahman Bhoiyan ; Faria Tasneem ; Md. Abdurrahim ; Subrata Mojumdar ; A T M Rakibul Alam ; Tanvir Mahtab Uddin ; Ahad Ahamed
Malaysian Journal of Medicine and Health Sciences 2026;22(No. 1):1-14
Introduction: This study aimed to develop an innovative bilayer tablet formulation of dapagliflozin and vildagliptin to increase therapeutic outcomes and patient compliance in diabetes management. Methods: By employing wet granulation, immediate-release, and sustained-release layers were formulated using various super-disintegrating and release-retarding agents, respectively. Several pre-compression parameters were utilized, such as Carr’s index, Hausner ratio, physical attributes (weight variations, friability, hardness), and disintegration time. Drug-excipient interactions were determined through employing FTIR, SEM, DSC, and TGA. In-vitro dissolution studies were performed to assess the release kinetics of these formulations. Results: For immediate-release dapagliflozin, our earlier study demonstrated that the formulations showed Carr’s index (23.5-33.3), physical attributes (weight (145–155 mg), thickness (4.42 ± 0.04 -4.46 ± 0.05 mm), hardness (3.7-5.6 kg/cm2), friability (<1%), and optimized rapid dissolution (F1: 80.50% ± 5.2 in 30 minutes). For sustained-release vildagliptin, the formulations showed Carr’s index (10.48-20), physical attributes (weight (194-203 mg), thickness (3.32 ± 0.06-3.33±0.04 mm), hardness (4.8 ± 0.1-7.6 ± 0.2 kg/cm2), friability (<1%)), and optimized controlled release (A5: 81.76% ± 2.4 in 360 minutes). The results found that F1 and A5 were the optimum formulation for the immediate release of dapagliflozin, and the sustained release of vildagliptin, respectively, and BT-1 was the optimum bilayer tablet because of its rapid onset of action for dapagliflozin (84.23% within 60 minutes) and sustained release for vildagliptin (80.026% within 360 minutes). Conclusion: Based on these data, the optimized bilayer tablet holds the potential to be a convenient and effective treatment option. Further, in-vivo assays are necessary to confirm its efficacy and safety.
2.Targeted yield concept and a framework of fertilizer recommendation in irrigated rice domains of subtropical India
R. BERA ; A. SEAL ; P. BHATTACHARYYA ; T.H. DAS ; D. SARKAR ; K. KANGJOO
Journal of Zhejiang University. Science. B 2006;7(12):963-968
Soil test crop response (STCR) correlation studies were carried out in Vindhyan alluvial plain during 2001 to 2004taking IR-36 as test crop to quantify rice production in the context of the variability of soil properties and use of balanced fertilizers based on targeted yield concept. The soils were developed on gently sloping alluvial plain with different physiographic settings and notable variation in drainage condition. Soil properties show moderate variation in texture (loamy to clay), organic carbon content (4.4 to 9.8 g/kg), cation exchange capacity (10.2 to 22.4 cmol (p+)/kg) and pH (5.3 to 6.4). Soil fertility status for N is low to medium (224 to 348 kg/ha), P is medium to high (87 to 320 kg/ha) and K ranges from medium to high (158 to 678 kg/ha).Database regarding nutrient requirement in kg/t of grain produce (NR), the percent contribution from the soil available nutrients [CS (%)] and the percent contribution from the applied fertilizer nutrients [CF (%)] were computed for calibrating and formulating fertilizer recommendations. Validity of the yield target for 7 and 8 t/ha was tested in farmers' fields and yields targets varied at less than 10%. The percent achievement of targets aimed at different level was more than 90%, indicating soil test based fertilizer recommendation approach was economically viable within the agro-ecological zone with relatively uniform cropping practices and socio-economic conditions.


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