Department of Chemical Technology, University of Calcutta, 92 A.P.C. Road, Kolkata 700 009, India.
Bioresour Technol. 2011 May;102(10):5878-83. doi: 10.1016/j.biortech.2011.02.034. Epub 2011 Feb 16.
This work was aimed to develop water resistant biocide film from renewable resources for applications in food and water technology. Guar gum, a polymeric galactomannan, was intrinsically modified to a new guar gum benzamide. Benzoylation was carried out by benzoyl chloride reaction in water medium and a propyl amine spacer was used to impart a high degree of hydrophobicity. The new guar gum benzamide was resistant to water and soluble in non aqueous solvent like dimethyl sulfoxide. Cast films of thickness 0.162 mm had a breaking point tensile strength of 21.95 Mpa. The water vapor permeability of biomaterial film was 0.28 g mm kPa(-1)h(-1)m(-2) and water contact angle on evaporative surface was 90.35 degree. Qualitative and quantitative biocide activity of film was established against Salmonella enterica, Escherichia coli, Staphylococcus aureus and Bacillus subtilis. The new guar gum benzamide absorbed strongly in UV region.
本工作旨在开发源自可再生资源的耐水型杀生剂薄膜，以应用于食品和水技术领域。瓜尔胶，一种聚合半乳甘露聚糖，经内在改性成为一种新型瓜尔胶苯甲酰胺。苯甲酰化反应在水介质中进行，并用丙胺间隔基赋予其高度疏水性。新型瓜尔胶苯甲酰胺耐水且可溶于二甲基亚砜等非水溶剂。厚度为 0.162 毫米的铸膜在断裂点时的拉伸强度为 21.95 MPa。生物材料薄膜的水蒸气透过率为 0.28 g mm kPa(-1)h(-1)m(-2)，蒸发面的水接触角为 90.35 度。薄膜对肠炎沙门氏菌、大肠杆菌、金黄色葡萄球菌和枯草芽孢杆菌的定性和定量杀生活性得以确立。新型瓜尔胶苯甲酰胺在紫外区有强烈吸收。
