Development of Natural Polysaccharide–Based Nanoparticles of Berberine to Enhance Oral Bioavailability: Formulation, Optimization, Ex Vivo, and In Vivo Assessment oleh Kanchan Kohli, Ali Mujtaba, Rozina Malik, Saima Amin, Md Sarfaraz Alam, Abuzer Ali, Md. Abul Barkat, Mohammad Javed Ansari