IBB - Institute for Biotechnology and Bioengineering, Centre of Biological Engineering, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal.
Carbohydr Polym. 2013 Feb 15;92(2):2154-62. doi: 10.1016/j.carbpol.2012.11.054. Epub 2012 Nov 29.
The aims of this study were the extraction of hemicellulose from wheat straw (WS) and its utilization in the reinforcement of a κ-carrageenan/locust bean gum (κ-car/LBG) polymeric blend films (PBFs). WS hemicellulose extraction was performed under autohydrolysis process and hemicellulose extracted (HE) under optimum condition was used in PBFs. PBFs were prepared varying different proportions of HE into the κ-car/LBG film-forming solutions. Barrier properties (water vapor permeability, WVP), mechanical properties (tensile-strength, TS and elongation-at-break, EB), moisture content, opacity and thermal properties of the resulting PBFs were determined and related with the incorporation of HE. The 2-3-2 proportion (in the high ratio) of PBF (κ-car/LBG/HE) causes a slight decrease of WVP and an increase of the TS, thus resulting in an improvement of the physical properties of PBFs. HE showed to be a promising material in order to reinforce κ-car/LBG PBF and can be an alternative in the application of hemicellulose according to biorefinery concept.
本研究的目的是从麦草（WS）中提取半纤维素，并将其用于增强κ-卡拉胶/刺槐豆胶（κ-卡拉/LBG）聚合物共混膜（PBF）。在自水解过程中进行 WS 半纤维素提取，在最佳条件下提取的半纤维素提取物（HE）用于 PBF。通过向κ-卡拉/LBG 成膜溶液中加入不同比例的 HE 制备 PBF。测定了所得 PBF 的阻隔性能（水蒸气透过率，WVP）、机械性能（拉伸强度，TS 和断裂伸长率，EB）、水分含量、不透明度和热性能，并与 HE 的加入相关联。在 2-3-2 的比例（高比例）下，PBF（κ-卡拉/LBG/HE）的 WVP 略有降低，TS 增加，从而改善了 PBF 的物理性能。HE 被证明是一种有前途的材料，能够增强 κ-卡拉/LBG PBF，并可以根据生物精炼概念替代半纤维素的应用。
