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Table 4 Crystallinity index (CI = A 1230 /A 1453 )

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

Biomass status

Chemicals

CI

Commercial PHB

-

4.7

Lyophilized

CH2Cl2

5.7

Lyophilized

SDS

4.7

Lyophilized

NaOH

4.5

Fresh biomass

NaOH + SDS

4.4

Lyophilized

NH4OH

4.2

Fresh biomass

NaOH

3.8

Lyophilized

-

2.9

Fresh biomass

NH4OH

2.1

  1. Larger value means that PHB is at a more crystallinity status and smaller value means that PHB is at a more amorphous status.