|Reference : Production of Biopolymers from Sugar Beet Pulp|
|Scientific congresses and symposiums : Poster|
|Physical, chemical, mathematical & earth Sciences : Chemistry|
|Production of Biopolymers from Sugar Beet Pulp|
|Meyer, Laurence [Faculté Universitaire des Sciences Agronomiques de Gembloux - FUSAGx > > Chimie Biologique Industrielle > >]|
|Paquot, Michel [Faculté Universitaire des Sciences Agronomiques de Gembloux - FUSAGx > > Chimie Biologique Industrielle > > >]|
|Dubois, Philippe [Université de Mons-Hainaut - UMH > > Laboratoire des matériaux Composites et Polymères > >]|
|22 et 23 mai 2009|
|[en] Sugar beet pulp ; Pectin ; biopolymers|
|[en] Sugar beet pulp is an important by-product of the sugar industry. In order to make the most of this waste, pectin extraction can constitute an economical solution.
Pectin is commonly used in food industry as a gelling agent. However, in the present study another use of pectin is considered: its potential embedding into biodegradable polymer films which can further be used in plastic industry.
At first, different pectin extraction methods have been developed on sugar beet pulp in order to obtain four different types of pectins characterized at the same time by their molecular weight degree of esterification.
Acidic extraction leads to pectin of high molecular weight and high degree of esterification. From this pectin, a de-esterification and a de-polymerization allow us to obtain, respectively, a pectin of high molecular weight and low degree of esterification and a pectin of low molecular weight and high degree of esterification. On the other hand, a basic extraction leads to pectin of low molecular weight and degree of esterification.
Preliminary, tests have been conducted on mixes comprising 5, 10, 15, 20 % of commercial pectin and PLA (polylactic acid) or PBAT (Polybutylen-adipate terephtalate). In all cases, the products were not stable and therefore the use of a compatibilizing agent was required. Glycerol and D-Sorbitol were thus studied for that purpose, in mixing ratios between 40-80 % with commercial pectin. The best mechanical properties (Young modulus; yield stress and yield strain) were obtained with the pectin/sorbitol 50/50 mix.
This proportion was then used with our different sugar beet pulp extracted pectins to produce PLA/pectin/Sorbitol 50/25/25 formulations. The best mechanical properties were reached with the low molecular weight end degree of esterification pectin. Indeed, the relative small size of this pectin with the lack of esterified groups enables interactions between pectin chains plastified by sorbitol and PLA. These interactions lead to a better cohesion of the high pectic content biomaterial.
|Région wallonne : Direction générale de l'Agriculture - DGA|
|Valorisation des pulpes de betterave en vue de la production de biopolymères à base de pectine|
|Researchers ; Professionals|
|File(s) associated to this reference|
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