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Table 3 Thermal degradation rate constants ( k D ) of various PHB samples at 170°C and thermal degradation rate constants relative to the commercial PHB reference ( k D,ref ) as a function of chemical treatment, purification method and purity

From: Feasibility study of an alkaline-based chemical treatment for the purification of polyhydroxybutyrate produced by a mixed enriched culture

Sample Chemical treatment PHB purity [wt.%] k D 10 −6 [1/s] k D /k D,ref 10 −6 [1/s]
Commercial PHB - 99 0.18 ± 0.02* 1.0
0.2 M NaOH 99 1.40 ± 0.10 8.0
0.2% SDS 99 0.80 ± 0.10 4.0
PHB from biomass - 67 5.40 ± 0.80 30.0
Solvent 99 0.08 ± 0.01 0.4
0.2 M NaOH 85 54.00 ± 5.00 300.0
0.2 M NaOH + 0.2% SDS 95 29.00 ± 2.00 161.0
  1. *k D of dried commercial PHB was used as a reference (k D,ref ).
  2. Water content in all samples was in between 0.01 – 0.02 wt%.