Development and Assessment of a Color-Variable Chlorine Dioxide Slow-Releasing Card for Litchi Preservation
Chlorine dioxide (ClO<sub>2</sub>) gas has attracted considerable attention due to its safety and efficiency. In this study, we successfully developed a color-variable ClO<sub>2</sub> slow-releasing card for postharvest litchi. The optimal ClO<sub>2</sub> slow-rel...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-01-01
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| Series: | Foods |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2304-8158/14/1/136 |
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| Summary: | Chlorine dioxide (ClO<sub>2</sub>) gas has attracted considerable attention due to its safety and efficiency. In this study, we successfully developed a color-variable ClO<sub>2</sub> slow-releasing card for postharvest litchi. The optimal ClO<sub>2</sub> slow-releasing card was prepared as follows: Card A was soaked in 2.5 mol/L NaClO<sub>2</sub> and 0.3 mol/L CaCl<sub>2</sub>. Card B was soaked in 1 mol/L oxalic acid, 0.3 mol/L CaCl<sub>2</sub>, and natural pigment. Finally, cards A and B were dried and adhered using 60% gelatin. The ClO<sub>2</sub> releasing time of the card was more than 120 h at 5–25 °C, and it could change color from dark yellow to white. The qualities of 3 kg litchi treated with no pieces (CK), half a piece (T1), one piece (T2), two pieces (T3), and three pieces (T4) of ClO<sub>2</sub> slow-releasing card were compared. The results showed that litchi of T1 had significantly (<i>p</i> < 0.05) higher <i>L*</i> and <i>a*</i> values but a lower respiration rate and relative conductivity than CK after 7 days of storage, showing the best pulp qualities and pericarp color. Further correlation analyses revealed a significant positive correlation (R<sup>2</sup> = 0.971) between Cya-3-O-gal-1 and <i>a*</i>, indicating a sharp decline in Cya-3-O-gal-1 and strong pericarp browning in CK. On the contrary, the low-releasing ClO<sub>2</sub> of T1 effectively inhibited Cya-3-O-gal-1 degradation. This could be one of the reasons for the superior pericarp color of T1. This study provides a visual, efficient, and economical solution for postharvest litchi. |
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| ISSN: | 2304-8158 |