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Study of tobacco-derived proteins in paper coatings
Biopolymers ( IF 3.2 ) Pub Date : 2021-04-01 , DOI: 10.1002/bip.23425 Joseph N Gutierrez 1 , Sachin Agate 1 , Richard A Venditti 1 , Lokendra Pal 1
Biopolymers ( IF 3.2 ) Pub Date : 2021-04-01 , DOI: 10.1002/bip.23425 Joseph N Gutierrez 1 , Sachin Agate 1 , Richard A Venditti 1 , Lokendra Pal 1
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Replacing synthetic polymers with renewable alternatives is a critical challenge for the packaging industry. This research investigated the use of leaf-based proteins as a sustainable co-binder in the coating formulations for paper-based packaging and other applications. Protein isolates from tobacco leaf and alfalfa concentrates were characterized using the Pierce protein assay, Kjeldahl nitrogen, and gel electrophoresis. The proteins were tested as co-binders in a typical latex-based paper coating formulation. The rheology and water retention properties of the wet coating and the surface, optical, structural, and strength properties of coated papers were measured. The coating performance was affected by the purity, solubility, and molecular weight of the tobacco protein and exhibited a shear-thinning behavior with lower water retention than soy protein. Analysis by scanning electron microscopy and time of flight secondary ion mass spectroscopy on the dried coating layer containing tobacco protein showed enhanced porosity (advantageous for package glueability) relative to the control latex coating. The tobacco protein offers adequate coverage and coating pigment distribution, indicating that this protein can be a suitable option in coatings for packaging applications.
中文翻译：
纸张涂料中烟草来源蛋白质的研究
用可再生替代品取代合成聚合物是包装行业面临的严峻挑战。这项研究调查了叶基蛋白作为纸基包装和其他应用的涂料配方中可持续辅助粘合剂的用途。使用皮尔斯蛋白测定、凯氏定氮法和凝胶电泳对烟叶和苜蓿浓缩物中的蛋白质分离物进行了表征。这些蛋白质在典型的乳胶纸涂料配方中作为辅助粘合剂进行了测试。测量了湿涂层的流变性和保水性以及涂布纸的表面、光学、结构和强度性能。涂层性能受到烟草蛋白的纯度、溶解度和分子量的影响，并且表现出剪切稀化行为，且保水性低于大豆蛋白。通过扫描电子显微镜和飞行时间二次离子质谱对含有烟草蛋白的干燥涂层进行的分析表明，相对于对照乳胶涂层，孔隙率有所提高（有利于包装的粘合性）。烟草蛋白提供了足够的覆盖率和涂层颜料分布，表明该蛋白可以成为包装应用涂层的合适选择。
更新日期：2021-05-26
中文翻译：
纸张涂料中烟草来源蛋白质的研究
用可再生替代品取代合成聚合物是包装行业面临的严峻挑战。这项研究调查了叶基蛋白作为纸基包装和其他应用的涂料配方中可持续辅助粘合剂的用途。使用皮尔斯蛋白测定、凯氏定氮法和凝胶电泳对烟叶和苜蓿浓缩物中的蛋白质分离物进行了表征。这些蛋白质在典型的乳胶纸涂料配方中作为辅助粘合剂进行了测试。测量了湿涂层的流变性和保水性以及涂布纸的表面、光学、结构和强度性能。涂层性能受到烟草蛋白的纯度、溶解度和分子量的影响，并且表现出剪切稀化行为，且保水性低于大豆蛋白。通过扫描电子显微镜和飞行时间二次离子质谱对含有烟草蛋白的干燥涂层进行的分析表明，相对于对照乳胶涂层，孔隙率有所提高（有利于包装的粘合性）。烟草蛋白提供了足够的覆盖率和涂层颜料分布，表明该蛋白可以成为包装应用涂层的合适选择。
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