New method to extract polyisoprene in Guayule without macromolecular structure degradation

New method to extract polyisoprene in Guayule

without macromolecular structure degradation

Sunisa SUCHAT

_{, Frédéric BONFILS}

_{, Christine CHAR}

_{, Serge PALU}

_,

Daniel PIOCH

1: CIRAD-UR 40

2: Prince of Songkla University,

3: CIRAD-UMR IATE

2

Introduction

Polyisoprene Native

macromolecular

structure ?

Soft method on

fresh biomass

Tetrahydrofuran

24 h – 30°C

SEC-MALS

Mw and yield of

extracted PI

BioRubber for Europe in Global Perspective – 24/25 September 2012 - Wageningen

Comparison to

ASE method on

dry biomass

0%

1%

2%

3%

4%

5%

6%

Fresh-SM Dry-SM Fresh-SM Dry-SM Dry-ASE Fresh-SM Dry-SM Dry-ASE

[P

I]

(

w

/w

d

ry

b

io

ma

ss

)

Harvest 1

Harvest 2

Harvest 3

Results: Extraction yield

  Same extraction yield between Fresh-SM and Dry-ASE

Yield of extracted PI according the extraction method

200

600

1000

1400

1800

2200

Fresh-SM Dry-SM Fresh-SM Dry-SM Dry-ASE Fresh-SM Dry-SM Dry-ASE

M

w

(

kg

/mo

l)

Harvest 1

Harvest 2

Harvest 3

4

Results: Mw

BioRubber for Europe in Global Perspective – 24/25 September 2012 - Wageningen

  Very high Mw for PI extracted with SM vs ASE

Mw of extracted PI according the extraction method

Conclusion

The use of SM is a real advantage allowing the use of fresh

biomass (non dried).

To minimize the likelihood of thermal and oxidative

degradation of the PI macromolecules during storage and

drying.

6

BioRubber for Europe in Global Perspective – 24/25 September 2012 - Wageningen