Table 4 Material properties of PHB from C. fritschii.

From: Two-stage (photoautotrophy and heterotrophy) cultivation enables efficient production of bioplastic poly-3-hydroxybutyrate in auto-sedimenting cyanobacterium

Sources of PHB

Thermal properties

Mechanical properties2

Molecular weight

Tm (°C)

Tg (°C)

Tcc (°C)

∆Hm (J/g)

Xc (%)

Elongation at break (%)

Tensile strength (MPa)

Young’s modulus (MPa)

Mw (kDa)

Mn (kDa)

Mw/Mn

Commercial PHB1

175.4 (159)

3.5

48

99

68

5.8 ± 1.1

24 ± 3

820 ± 300

970

330

2.9

Chlorogloea fritschii

171.6 (171)

3.2

54

65

45

5.5 ± 1.8

23 ± 6

712 ± 256

545

256

2.1

  1. Sixteen-d old photoautotrophically-grown cells were transferred to -N-P medium in the dark with 0.1% (w/v) acetate for 6 d. The dried biomass was extracted for PHB. Tm, melting temperature (first melting peak shown in parentheses); Tg, glass-transition temperature; Tcc, cold-crystallization temperature; ∆Hm, enthalpy of fusion; Xc, crystallinity; Mw, weight-average molecular weight; Mn, number-average molecular weight; Mw/Mn, polydispersity.
  2. 1Data from Sigma-Aldrich (St. Louis, MO, USA).
  3. 2The mechanical properties are shown as the mean ± 1 SD of three independent experiments.
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