Improved Properties of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) Produced by Comamonas sp. EB172 Utilizing Volatile Fatty Acids by Regulating the Nitrogen Source

Table 1

PHA yield and mechanical and thermal properties of P(3HB-co-3HV) copolymer produced by Comamonas sp. EB172.

Polymer	Sample	3HV (mol%)^1	PHA yield, 𝑌𝑝/𝑠 (g/g)	𝑀𝑛 (×10^3), Da^2	𝑀𝑤/𝑀𝑛^2	𝑇𝑚	Tensile; (MPa)^3	Young’s modulus; (GPa)^3
P(3HB-co-3HV)	C/N 15; (mol/mol)	8	0.19	737	1.9	161	13.2	0.34
	C/N 5; (mol/mol)	7	0.11	622	2.1	162	14.4	0.31
	C/N 34.4; (mol/mol)	6	0.25	838	1.8	157	14.1	0.26
Polyethylene, low density (LDPE)^4		—	—	—	—	—	13.5	0.30

1Determined by GC analysis from lyophilized cells.
²Determined by gel permeation chromatography.
³Determined by Instron Universal Testing Machine.
⁴Adopted from Alexy et al. [25].