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Xyloglucan film

一种木葡聚糖、半乳糖的技术，应用在木葡聚糖膜领域，能够解决水溶性丧失等问题

Active Publication Date: 2016-08-17
STORA ENSO OYJ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This seems impossible since hydrophobic modification leads to loss of water solubility, which is a drawback in water-based green treatment concepts

Method used

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Experimental program
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Effect test

preparation example Construction

[0036] Another advantage of using XG comprising up to 11 mol % of galactose residues in the preparation of the membranes of the invention is that XG comprising up to 11 mol % of galactose residues can be redissolved in water by simple mechanical homogenization , such as with a high shear mixer or in a microfluidizer; and optionally in combination with sonication. Xyloglucans comprising up to 11 mole % of galactose residues are also soluble in organic solvents, ionic solvents or ionic liquids, or mixtures of these solvents with each other or with water, such as dimethylsulfoxide , N-methylmorpholine N-oxide, dimethylformamide, dimethylacetamide, dimethylacetamide / LiCl, 1,3-dimethyl-3,4,5,6-tetrahydro -2(1H)-pyrimidinone, NaOH (aq), LiOH / urea, NaOH / urea, ammonium hydroxide.

[0037] Another advantage is the increase in elastic modulus, eg at 50% RH from 4.6 GPa for unmodified xyloglucan derived from tamarind to 5.4 GPa for XG containing up to 11 mol% galactose residues. Also f...

Embodiment

[0065] Material

[0066] Enzyme modification of xyloglucan. Industrially available tamarind seed xyloglucan (weight average molecular weight, 1.5-2.0 MDa, Innovassynth technologies Ltd., India) was separated by centrifugation (4000 rpm for 45 minutes) of a 0.5 wt % dilute solution purified and lyophilized to obtain pure xyloglucan. 2 g of lyophilized xyloglucan were dissolved in 80 ml of 50 mM sodium acetate buffer (pH=4.5). For partial removal of galactose side groups, 50 mg β-galactosidase (derived from Aspergillus oryzae, Sigma Aldrich) dissolved in 5 ml MilliQ water was added to the XG solution. The reaction mixture was kept at 30°C for different treatment times - 24h, 51h and 64h. After the specified time the reaction was terminated by heating at 90°C for 30 minutes to inactivate the enzyme. Modified XG (mXG) was purified by precipitation and washing in ethanol, and dried in a vacuum oven at 50 °C for 24 h. The modified XG samples were insoluble or slightly soluble ...

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Abstract

The present invention relates to films comprising a xyloglucan comprising not more than 11 mol% galactose residues, as well as a method for making such films, and its use as an oxygen barrier.

Description

technical field [0001] The present invention relates to a membrane comprising xyloglucan comprising not more than 11 mol % of galactose residues, a process for the preparation of the membrane and its use as an oxygen barrier. Background technique [0002] Oxygen barrier and mechanical properties at high humidity are often critical for materials used in food packaging. The transfer of oxygen through food packaging is an important cause of food degradation and has an impact on product shelf life (AL Brody, et al., Journal of Food Science, 2008, 73, R107; and J Lagaron, et al., Materials Science and Technology, 2004, 20, 1). A traditional barrier layer is aluminum in foil or metallized form (Y Leterrier, Progressin Materials Science, 2003, 48, 1). Layers of barrier polymers such as poly(vinylidene chloride) (PVDC), poly(ethylene vinyl alcohol) (EVOH), poly(vinyl alcohol) (PVOH) and polyamide (PA) have more than enough properties, but Oxygen is prepared from petroleum sources...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C09D105/14
CPCC09D105/14C08J2305/14C08B37/0057C08J5/18
Inventor J.J.科库马拉伊尔L.伯格伦德
Owner STORA ENSO OYJ
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