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CaCO3 thin-film formation mediated by a synthetic protein-lysozyme coacervate

机译：合成蛋白-溶菌酶凝聚层介导的CaCO 3 薄膜形成

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摘要

Coacervation is a liquid–liquid phase separation process of macromolecular polyelectrolytes. The formation of simple and complex coacervates of a synthetic acidic protein, GG1234, as a model shell matrix protein, was investigated using turbidity measurements and microscopic morphological observations. Simple coacervation of GG1234 was optimally induced at pH 3.75 and below 50 mM for all of the tested salts, and complex coacervates were prepared at pH 4–9 in sodium acetate solution at various ratios of GG1234 to lysozyme without inducing simple coacervation. The complex coacervates also had the ability to microencapsulate hydrophobic oil droplets in a similar manner to that of other complex coacervation systems. Remarkably, a thin film was formed through in vitro CaCO3 crystallization in the presence of complex coacervates, which was expected to be planar and poorly crystalline CaCO3 guided at the interface of two immiscible liquid phases upon complex coacervation. Collectively, our results indicate that our synthetic acidic matrix protein can be used as the main protein for simple and complex coacervations, and the coacervates of this protein may be involved in thin film formation in CaCO3 crystallization.
机译：凝聚是大分子聚电解质的液相-液相分离过程。使用浊度测量和微观形态学观察了合成酸性蛋白GG1234作为模型壳基质蛋白的简单和复杂凝聚层的形成。对于所有测试的盐，在最佳pH 3.75和低于50 mM的条件下，均可最佳诱导GG1234的简单凝聚，并且在各种pH GG1234与溶菌酶的比率下，在乙酸钠溶液中于pH 4–9制备复杂凝聚层，而不会引起简单凝聚。所述复合凝聚层还具有以与其他复合凝聚层类似的方式微囊化疏水性油滴的能力。值得注意的是，在复杂凝聚层存在下，通过体外 CaCO 3 结晶形成了薄膜，该薄膜预计是平面的且结晶性差复合凝聚后，CaCO 3 在两个不混溶液相的界面处被引导。总的来说，我们的结果表明我们合成的酸性基质蛋白可以用作简单和复杂凝聚的主要蛋白，并且该蛋白的凝聚可能参与CaCO 3 的薄膜形成。 结晶。

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