Quality by Design-Based Development and Optimization of Three Polyherbal Antidiabetic Formulations Containing Gymnema sylvestre, Momordica charantia, and Syzygium cumini

Abstract

Background: Type 2 diabetes mellitus remains a paramount global public health challenge, requiring long-term therapeutic strategies with minimal adverse effects. Polyherbal formulations containing standardized extracts of Gymnema sylvestre, Momordica charantia, and Syzygium cumini exhibit synergistic antidiabetic potential. However, traditional herbal formulation approaches often suffer from batch-to-batch variability, poor mechanical strength, and non-reproducible dissolution profiles. Objective: This study aimed to apply Quality by Design (QbD) principles to systematically develop and optimize three distinct polyherbal antidiabetic formulations (F1: Immediate-Release Tablet, F2: Matrix Sustained-Release Tablet, and F3: Multiparticulate Capsule) ensuring consistent quality and performance. Materials and Methods: A Quality Target Product Profile (QTPP) and Critical Quality Attributes (CQAs) were established. Initial risk assessment was performed using an Ishikawa diagram and Failure Mode and Effects Analysis (FMEA). A three-factor, three-level Box–Behnken Design (BBD) was employed to evaluate the impact of Critical Material Attributes (HPMC K100M concentration, PVP K30 binder level) and Critical Process Parameters (compression force) on disintegration time (), friability (), and cumulative percentage drug release at 60 minutes (). Results: Mathematical modeling and Analysis of Variance (ANOVA) demonstrated high model significance (,  for all responses). Polynomial regression equations delineated the non-linear interaction between binder concentration and compression force on tablet hardness and dissolution behavior. Numerical optimization using the desirability function () yielded optimized formulations meeting all predefined acceptance criteria. F1 demonstrated rapid disintegration (< 8 min) with > 85% release in 30 min, F2 achieved controlled release over 12 h following Higuchi kinetics (), and F3 exhibited excellent multiparticulate flow and uniform capsule filling. Accelerated stability studies () confirmed physical and chemical stability over six months. Conclusion: Implementing QbD principles facilitated a robust, science-based manufacturing framework for standardized polyherbal dosage forms, providing enhanced quality assurance and scalability for herbal phytotherapeutics.