Pineapple-Leaf-Derived, Copper-PAN-Modified Regenerated Cellulose Sheet Used as a Hydrogen Sulfide Indicator

Regenerated cellulose (RC) produced from waste pineapple leaves was used to develop a colorimetric sensor as a Cu-PAN sheet (RCS). Microcrystalline cellulose derived from dried pineapple leaves was combined with Cu-PAN, dissolved in NaOH and urea, and made into an RC sheet using Na2SO4 as a coagulant. The RCS was used as an H2S indicator at various H2S concentrations (0-50 ppm) and temperatures (5-25 degrees C). The RCS color changed from purple to New York pink when exposed to H2S. A colorimeter method was used to develop prediction curves with values of R2 > 0.95 for H2S concentrations at 5-25 degrees C. The physicochemical properties of fresh and spent RCS were characterized using various techniques (Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy/energy-dispersive X-ray spec-troscopy, and thermogravimetric analysis). In addition, when stored at 5 and 25 degrees C for 90 days, the RCS had outstanding stability. The developed RCS could be applied to food packaging as an intelligent indicator of meat spoilage.

Automated summary

Regenerated cellulose (RC) produced from waste pineapple leaves was used to develop a colorimetric sensor called Cu-PAN sheet (RCS), which changed color when exposed to H2S. Prediction curves with high accuracy for H2S concentrations were developed using a colorimeter method. The developed RCS showed excellent stability and could be used as an intelligent indicator of meat spoilage in food packaging.