Optimization of β-carotene production from agro-industrial by-products by Serratia marcescens ATCC 27117 using Plackett–Burman design and central composite design

β-carotene is a widely known carotenoid molecule, commercially used as food and feed additive, cosmetic and pharmaceutical products. The current study investigates the usability of some agro-industrial by-products for β-carotene production by Serratia marcescens and optimizes the production process using Plackett–Burman Design (PBD) and central composite design (CCD).