Dragon Fruit Freshness Detector Based on Methyl Red Colour Indicator

A comprehensive review of intelligent packaging for fruits and vegetables: Target responders, classification, applications, and future challenges

“…Relevant applications of CO 2 ‐based intelligent packaging and monitoring of F&V are represented in Table 1. The majority of the previous studies have taken into account using pH‐sensitive chemicals or natural colorants to track pH variations and CO 2 generation as quality indicators of how frequently peppers (Chen et al., 2018), dragon fruit (Warsiki & Rofifah, 2018), mushrooms (Liu, Wu et al., 2022), and cantaloupe (Lu et al., 2018) breathe. A study identified a 3:2 mix of the common chemical dye methyl red and bromothymol blue as freshness indicator labels to assess the freshness of freshly cut peppers.…”

“…Meanwhile, the aerobic colony count, weight loss, chlorophyll content, malondialdehyde content, membrane permeability, and sensory scores of the peppers were almost synchronized with the change in quality reflected by the indicator labels. Interestingly, another study employed an indicator label with methyl red dye to monitor variations of CO 2 in dragon fruit packages (Warsiki & Rofifah, 2018). As CO 2 in the package varied, the color of the label changed from yellow to red, and the color variation became more pronounced as the dragon fruit was stored, closely corresponding with storage quality.…”

“…Schematic diagram of the intelligent packaging system for fruits and vegetables. Partial figure from Warsiki and Rofifah (2018), Guo, Xue et al. (2022), Han et al.…”

Application of Intelligent Label in Monitoring the Physical and Chemical Quality of Mango Manaliga (Mangifera Indica L)

“…In knowing the level of fruit maturity, consumers usually carry out activities by pressing the fruit to ensure the level of fruit hardness. This practice will leave bruises on the fruit which can affect changes in the physical and chemical quality of the fruit (Warsiki and Rofifah, 2018). Putri et al (2019), reported that one of the efforts to make it easier to know the level of fruit ripeness without having to press it is to use a ripeness indicator label (Ripeness Indicator).…”

“…The application of labels on mangoes is intended to determine the relationship between changes in label color and a decrease in fruit quality (Warsiki and Rofifah, 2018). In applying the label to the packaging, the packaging used is a type of polypropylene (PP) plastic with dimensions of 13.5 x 13.5 x 7.5 cm.…”