| Summary: | This study was performed to develop and characterize a bio-film composed of Aloe vera (<i><i>Aloe barbadensis</i></i>), green banana Saba (<i>Musa acuminata</i> x <i>balbisiana</i>), and curcumin for the detection of Fe<sup>2+</sup> ions. Cross-linking interaction between banana starch-aloe vera gel and banana starch-curcumin enhanced l the sensing performance of the composite film towards divalent metal ions of Fe<sup>2+</sup>. The morphological structure of the Aloe vera-banana starch-curcumin composite revealed a smooth and compact surface without cracks and some heterogeneity when observed under Scanning Electron Microscopy (SEM). The thickness, density, color property, opacity, biodegradation, moisture content, water-solubility, water absorption, swelling degree, and water vapor permeability of bio-films were measured. The incorporation of aloe vera gel and curcumin particles onto the banana starch film has successfully improved the film properties. The formation of the curcumin-ferrum (II) complex has triggered the film to transform color from yellow to greenish-brown after interaction with Fe<sup>2+</sup> ions that exhibit an accuracy of 101.11% within a swift reaction time. Good linearity (R<sup>2</sup> = 0.9845) of response on colorimetric analysis was also obtained in Fe<sup>2+</sup> ions concentration that ranges from 0 to 100 ppm, with a limit of detection and quantification found at 27.84 ppm and 92.81 ppm, respectively. In this context, the film was highly selective towards Fe<sup>2+</sup> ions because no changes of color occur through naked eye observation when films interact with other metal ions, including Fe<sup>3+</sup>, Pb<sup>2+</sup>, Ni<sup>2+</sup>, Cd<sup>2+</sup>, and Cu<sup>2+.</sup> Thus, these findings encourage curcumin-based starch films as sensing materials to detect Fe<sup>2+</sup> ions in the field of food and agriculture.
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