Table 1 Synthesis of α-1,3-glucan esters.

From: In vitro synthesis of linear α-1,3-glucan and chemical modification to ester derivatives exhibiting outstanding thermal properties

Sample

DS

Reaction Time (hours)

Mw(x104)

Mn(x104)

Mw/Mn

Td.5%(°C)

Tg(°C)

Tc(°C)

Tm(°C)

Yield (%)

α-1,3-glucan acetate

3

48

16

7.1

2.3

350

177

258

339

73

α-1,3-glucan propionate

3

72

21

8.9

2.3

355

119

239

299

72

α-1,3-glucan from in vitro synthesis at 30 °C

20

9.0

2.3

237

—

—

—

12

α-1,3-glucan from in vitro synthesis at 15 °C

70

36

1.9

238

—

—

—

1.1

  1. Degree of substitution (DS), number-average (Mn) and weight-average (Mw) molecular weights. molecular weight distribution (Mw/Mn), temperature at 5% weight-loss (Td.5%), glass transition temperature (Tg), crystallization temperature (Tc), melting temperature (Tm) and yield of α-1,3-glucan and its esters (yield (%) = (actual yield/theoretical yield) x 100).
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