A sugarcane bagasse nanocellulose-based hydrogel was developed as a colourimetric freshness indicator for monitoring spoilage of chicken breast. Nanocellulose was prepared from sugarcane bagasse cellulose filaments by TEMPO-mediated oxidation, and then used to form a strong self-standing hydrogel matrix through Zn²⁺ cross-linking. The hydrogel worked as a carrier for pH-responsive dyes (bromothymol blue/methyl red), which changed colour according to the freshness of the chicken sample. CO₂ levels were found to increase with the spoilage of chicken, relative to rising levels of micro-organisms. The indicator hydrogel optical colour changed from green to red on the third day, as the log CFU/g passed the limit of acceptability for human consumption and emission of complicated volatiles. This new design of colourimetric freshness indicator made with a nanocellulose hydrogel has a quick response to chicken spoilage and is expected to facilitate the utilisation of bagasse nanocellulose as a value-added material in intelligent packaging.

开发了基于甘蔗渣纳米纤维素的水凝胶作为比色新鲜度指示剂，用于监测鸡胸脯变质。纳米纤维素是由甘蔗渣纤维素丝通过TEMPO介导的氧化反应制得的，然后用于通过Zn ²⁺交联形成牢固的自立式水凝胶基质。水凝胶可作为pH响应型染料（溴百里酚蓝/甲基红）的载体，该染料根据鸡肉样品的新鲜度而变色。一氧化碳₂相对于微生物水平的升高，鸡的腐败水平升高了。随着对数CFU / g超过人类食用和排放复杂挥发物的可接受性极限，指示剂水凝胶的光学颜色在第三天从绿色变为红色。由纳米纤维素水凝胶制成的比色新鲜度指示剂的这种新设计可快速响应鸡肉变质，并有望促进甘蔗渣纳米纤维素在智能包装中的增值利用。