Development of cellulose from recycled office waste paper-based composite as a platform for the colorimetric sensor in food spoilage indicator

Colorimetric sensor was successfully prepared from office waste paper-based composite. Chitosan film was coated onto surface in order to ensure the dimensional stability and reduce the water adsorption. 0.1%w/v of methyl red was employed as a sensing element. Fourier transform infrared confirmed that chitosan and methyl red were attached on the surface of cellulose. No significant change of crystallinity was observed. Morphological properties of cellulose-based composite were randomly oriented. Chitosan and methyl red were integrated in porous network. The existence of nitrogen atom was reported by Energy dispersive analysis. This element can be used to determine the position of chitosan and methyl red. Paper based composite was thermally stable up to 300 ºC. The roughness of surface was estimated to be 10–12 micron. Intensity of color was slightly enhanced when composite was attached to vapor of biogenic amine. It can be observed for 8 h. It was remarkable to note that office waste paper can be employed as a substrate in colorimetric sensor for food spoilage detection.