Influence of hydrogen sulfide gas concentrations on LOD and LOQ of thermal spray coated hybrid-bacterial cellulose film for intelligent meat label

Abstract

Hybrid nanocomposite thin film for hydrogen sulfide (H₂S) gas sensor based on bacterial cellulose nanocrystals (BCNCs) has resulted in high demand of environmentally friendly nanomaterials. Films were prepared using thermal spray coating that sprayed hybrid nanocomposite suspension based on silver nanoparticles (AgNPs)-loaded BCNCs's surface and alginate-molybdenum trioxide (MoO₃NPs) onto PET substratum. In this study, a novel food package label characterized as H₂S gas sensor for meat spoilage is based on an optically transparent coated film with thickness ranging from 0.73 to 2.18 μm. Sensor characteristics with different suspension concentrations and various H₂S gas concentrations were evaluated. The highest sensitivity to H₂S with the limit of detection (LOD) (3.27 ppm) and the limit of quantification (LOQ) (10.94 ppm) was exhibited in 1%w/v suspension. Label prototypes which respond as visible color changes through naked-eye to H₂S gas released during meat spoilage, monitored at 4 °C and varying storage times were conducted.

Keywords: Bacterial cellulose nanocrystals; Hybrid nanocomposite; Hydrogen sulfide gas sensor; Intelligent meat label; Metal nanoparticles; Thermal spray coating.