**6. Applications**

PHA has a lot of advantages over conventional plastics because of its sustainability, now fossil plastics are to be replaced the major obstacle to be faced is the reduction of the cost associated with microbiological plastic production. The cost of producing traditional petroleum-based plastic in 2002 was €1.00/kg, which was considerably less than the €9.00/kg cost of PHA. Even when compared to other sustainable polymers, like PLA, which costs €1.72/kg, microbiological manufacture of PHA costs €2.49/kg,

which is still pricey [103, 104]. Carbon source plays an important role in facing the obstacles such as yield of the input, fermentation, productivity, and downstream processing [105, 106].
