Page 292 - Demo

296 PROCEEDINGS OF INTERNATIONAL SCIENTIFIC CONFERENCE ON APPLIED BIOTECHNOLOGY3.2. Suitability of different solid substrates for pigment productionThe study highlights the significant impact of substrate type on pigment yield in solid-state fermentation using M. purpureusHG12. Among the tested substrates, rice bran demonstrated the highest yield (4.627 %u00b1 0.03 O.D/g dry substrate), likely due to its superior nutrient content and porous structure, which support fungal growth and pigment synthesis. Plain rice showed moderate yield (2.627 %u00b1 0.03), while red rice had the lowest (1.90 %u00b1 0.03), possibly due to its dense structure and lower nutrient availability. These findings underscore the potential of rice bran as an optimal and cost-effective substrate for industrial-scale natural pigment production.Table 1. Effect of different substrates on pigment yield (O.D/g dry substrate) by solid fermentation grown culture of Monascus purpureus HG12Substrate Pigment yield(O.D/g dry substrate)Plain rice 2.627%u00b10.03Red rice 1.90%u00b10.03Rice bran 4.627%u00b10.03 (a) (b) (c)Figure 2. The pigment formation of the M. purpureus HG12 strain after 20 days of cultivation on substrates such as plain rice (a), red rice (b), and rice bran (c)