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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2025-01-01
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| author | Li Guo Guang Wu Qingchun Yin Lin Luo Hao Deng |
| author_facet | Li Guo Guang Wu Qingchun Yin Lin Luo Hao Deng |
| author_sort | Li Guo |
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| description | 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. |
| format | Article |
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| institution | Kabale University |
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| language | English |
| publishDate | 2025-01-01 |
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| series | Foods |
| spelling | doaj-art-1fe09adc621047a780c6ba6c6ca960e52025-01-10T13:17:54ZengMDPI AGFoods2304-81582025-01-0114113610.3390/foods14010136Development and Assessment of a Color-Variable Chlorine Dioxide Slow-Releasing Card for Litchi PreservationLi Guo0Guang Wu1Qingchun Yin2Lin Luo3Hao Deng4Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510641, ChinaKey Laboratory of Tropical Fruit and Vegetable Cold-Chain of Hainan Province, Institute of Agro-Products of Processing and Design, Hainan Academy of Agricultural Sciences, Haikou 571100, ChinaKey Laboratory of Tropical Fruits and Vegetables Quality and Safety, State Administration for Market Regulation, Institute of Food Testing, Hainan Academy of Inspection and Testing, Haikou 570314, ChinaGuangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510641, ChinaGuangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510641, ChinaChlorine 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.https://www.mdpi.com/2304-8158/14/1/136ClO<sub>2</sub> slow-releasing cardcolorlitchidevelopmentassessment |
| spellingShingle | Li Guo Guang Wu Qingchun Yin Lin Luo Hao Deng Development and Assessment of a Color-Variable Chlorine Dioxide Slow-Releasing Card for Litchi Preservation Foods ClO<sub>2</sub> slow-releasing card color litchi development assessment |
| title | Development and Assessment of a Color-Variable Chlorine Dioxide Slow-Releasing Card for Litchi Preservation |
| title_full | Development and Assessment of a Color-Variable Chlorine Dioxide Slow-Releasing Card for Litchi Preservation |
| title_fullStr | Development and Assessment of a Color-Variable Chlorine Dioxide Slow-Releasing Card for Litchi Preservation |
| title_full_unstemmed | Development and Assessment of a Color-Variable Chlorine Dioxide Slow-Releasing Card for Litchi Preservation |
| title_short | Development and Assessment of a Color-Variable Chlorine Dioxide Slow-Releasing Card for Litchi Preservation |
| title_sort | development and assessment of a color variable chlorine dioxide slow releasing card for litchi preservation |
| topic | ClO<sub>2</sub> slow-releasing card color litchi development assessment |
| url | https://www.mdpi.com/2304-8158/14/1/136 |
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