Natural carbon source is generally referred to glucose, starch and sucrose. Many crop products or crops itself contains large amount of natural carbon sources. Also the extracts from the crop residues acts a cheap carbon source for PHB production.

As PHB is produced under nutritional stress conditions, so instead of using crops/ natural products... I suggest you to go for distillery waste effluent (also called as Molasses). It contains sugar content in abundant quantity. Also, the discarded and degraded food grains from godowns can be used as rich natural carbon source.

Thanks,

Natural carbon source is generally referred to glucose, starch and sucrose. Many crop products or crops itself contains large amount of natural carbon sources. Also the extracts from the crop residues acts a cheap carbon source for PHB production.

As PHB is produced under nutritional stress conditions, so instead of using crops/ natural products... I suggest you to go for distillery waste effluent (also called as Molasses). It contains sugar content in abundant quantity. Also, the discarded and degraded food grains from godowns can be used as rich natural carbon source.

Thanks,

Molasses. Crop residues must be pretreated in order to release glucose as a monomer

You may also try lignocellulosic biomass