รายละเอียดเอกสาร

The physico-mechanical and ethylene scavenging properties of active packaging consisting of paper prepared from bamboo (Bambusa vulgaris) fibers loaded with varying concentrations of nano titanium dioxide/cuprous oxide (TiO2/Cu2O) composite was investigated for its ability to delay ripening of Philippine climacteric fruits. Tests of paper containing 1% to 5% TiO2/Cu2O showed no or limited negative impact on its physical, optical, and mechanical properties. Images from a field emission scanning electron microscope equipped with energy-dispersive X-ray spectroscopy (FESEM-EDS) showed dispersion and agglomeration of TiO2/Cu2O nanoparticles on the paper surface. The percent weight of titanium and copper increased with increasing metal oxide composite concentration used in this study. Attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy indicated small shifts in band intensity at 3330 cm-1 and 1100 cm-1 in the hydroxyl (O-H) and C-O regions, respectively, suggesting possible chemical or physical interactions between the metal oxide and paper. Contact angle measurement suggest- ed that TiO2/Cu2O nanoparticles may have imparted paper hydrophobicity at 3% & 5% concentration, possibly through increased microscale roughness. The ethylene scavenging experiment indicated that there was a significant delay in the ripening process of mango and tomato when packed in paper doped with 3% and 5% TiO2/Cu2O. The fruits were greener with a firmer texture compared with untreated control after three days of storage under natural light and ambient condition. The preliminary results suggested that 3% &5% TiO2/Cu2O active packaging modification can remove ethylene from the fruit's storage environment, extending shelf life and maintain quality for three days. This simple technique could have potential economic benefits for the fruit industry by directly reducing post-harvest waste, and the delayed ripening could provide flexibility in supply chain management.