Photoactivated TiO2 Nanocomposite Delays the Postharvest Ripening Phenomenon through Ethylene Metabolism and Related Physiological Changes in Capsicum Fruit

Abstract

Capsicum is one of the most perishable fruit which undergo rapid loss of commercial value during postharvest storage. In this experiment our aim is to evaluate the effect of photoactivated TiO2 nano-particle complexed with chitosan or TiO2-nanocomposite (TiO2-NC) on extension self-life of Capsicum fruit and its effect on related morphological, physiological and molecular attributes at room temperature (25 °C). Initially, TiO2-NC coated fruits recorded superior maintenance of total soluble solids accumulation along with retention of firmness, cellular integrity, hydration, color etc. On the extended period of storage, fruit recorded a lower bioaccumulation of TiO2 in comparison to metallic silver over the control. On the level of gene expression for ethylene biosynthetic and signaling the TiO2-NC had more regulation, however, discretely to moderate the ripening. Thus, ACC synthase and oxidase recorded a significantly better downregulation as studied from fruit pulp under TiO2-NC than silver. On the signaling path, the transcripts for CaETR1 and CaETR2 were less abundant in fruit under both the treatment when studied against control for 7 d. The reactive oxygen species (ROS) was also correlated to retard the oxidative lysis of polyamine oxidation by diamine and polyamine oxidase activity. The gene expression for hydrolytic activity as non-specific esterase had corroborated the development of essential oil constituents with few of those recorded in significant abundance. Therefore, TiO2-NC would be reliable to induce those metabolites modulating ripening behavior in favor of delayed ripening. From gas chromatography-mass spectrometry (GC-MS) analysis profile of all tested essential oil constituents suggesting positive impact of TiO2-NC on shelf-life extension of Capsicum fruit. Our results indicated the potentiality of TiO2-NC in postharvest storage those may connect ethylene signaling and ROS metabolism in suppression of specific ripening attributes.

Effect of Potassium Permanganate, Ultraviolet Radiation and Titanium Oxide as Ethylene Scavengers on Preservation of Postharvest Quality and Sensory Attributes of Broccoli Stored with Tomatoes

“…Mansourbahmani et al [ 18 ] observed that the TPC data after 35 days of treatment by applying 20% potassium permanganate mixed with zeolite in a 1:2 ratio were 35% higher than for untreated tomatoes. Ghosh et al [ 45 ], in 2022, applied photoactivated titanium dioxide and chitosan to create a film for coating ‘Tejaswani’ peppers stored at room temperature (25 °C). The treated peppers exhibited maintained soluble solid content (SSC) along with enhanced color.…”

Comprehensive Literature Review on Metal Nanoparticle for Enhanced Shelf Life of Mango Fruit

“…The fact that titanium oxide nanoparticles (TiO 2 ) prolong the shelf life of fruits has also been shown in numerous studies. Studies conducted by Yong and Liu [ 39 ], Jiang et al [ 40 ], Fathi et al [ 41 ], Ghosh et al [ 42 ], and Patel and Mishra [ 43 ] are a few of these studies. Antimicrobial agents can be added to food packaging materials to suppress bacteria and extend the product's realistic useable life.…”

Antibacterial Nanocellulose-TiO2/Polyester Fabric for the Recyclable Photocatalytic Degradation of Dyes

“…The characteristic peaks at 1015 cm −1 and 720 cm −1 corresponded to the -C-H of the PET. Compared to the PET, the characteristic peak at 2899 cm −1 in the NC-TiO2/PET was the typical band for the cellulose nanomaterial molecules, and the strong characteristic peaks below 700 cm −1 were due to the bending of the -Ti-O bonds in the NC-TiO2/PET [21]. In addition, the characteristic peaks of the cellulose nanofibers were clearly visible in the broad bands' 3600-3000 cm −1 region and were caused by telescopic vibrations within and between the O-H bonds.…”