2.4. Dry Cell Weight Analysis
Dry cell weight (DCW) was estimated by harvesting cells at 4500 g at 4°C for 20 m. Each supernatant was discarded and each pellet washed three times with phos- phate-buffered saline (PBS, pH 7.2). Resuspended cells were again harvested by centrifugation at 4500 g at 4°C for 20 min. Each pellet was resuspended in 600 μL dis- tilled water and transferred to a pre-weighed vial. Cell pellets were dried at 60°C for 12 h using a speed vacuum concentrator (Biotron 4080C). Each vial was weighed and DCW value estimated.