Preparation of Hydrophobic Purple Sweet Potato-Based Intelligent Packaging Films by Stearic Acid Coating and Heat Pressing Treatments
The high hydrophilicity of biopolymer–anthocyanin intelligent packaging films seriously limits their applications in high-humidity environments. Here, a surface hydrophobization technique was adopted to overcome the hydrophilicity of purple sweet potato (PSP)-based intelligent packaging films throug...
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| Format: | Article |
| Language: | English |
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MDPI AG
2025-04-01
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| Series: | Foods |
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| Online Access: | https://www.mdpi.com/2304-8158/14/7/1276 |
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| author | Xuanzhuo Liu Fengfeng Xu Xiaoqian Huang Jian Sun Juan Kan Jun Liu |
| author_facet | Xuanzhuo Liu Fengfeng Xu Xiaoqian Huang Jian Sun Juan Kan Jun Liu |
| author_sort | Xuanzhuo Liu |
| collection | DOAJ |
| description | The high hydrophilicity of biopolymer–anthocyanin intelligent packaging films seriously limits their applications in high-humidity environments. Here, a surface hydrophobization technique was adopted to overcome the hydrophilicity of purple sweet potato (PSP)-based intelligent packaging films through stearic acid (SA) coating combined with heat pressing treatments. The structural characteristics, physical properties, and color changeability of the films were investigated. After SA coating treatment, the surface of the films was loosely covered by thick SA layers. As compared with the untreated PSP films, the SA-coated films displayed lower transparency, mechanical property, moisture content, surface wettability, anthocyanin leaching potential, and color changeability. When the SA-coated films were further heat-pressed, the SA-coated layers were closely bound to the films. The heat-pressed films had a higher transparency, mechanical property, and water vapor blocking ability than the SA-coated films. Notably, the color and color changeability of the heat-pressed films were affected by the heat pressing temperature. The films heat-pressed at 100 °C showed a vivid purple color and elevated color changeability, whereas the films heat-pressed at 150 °C showed a brown color and lost color changeability. This study demonstrates that SA coating combined with heat pressing is effective in constructing surface-hydrophobized intelligent packaging films. |
| format | Article |
| id | doaj-art-5f23fcdc7e524fb3876187634b953c1e |
| institution | DOAJ |
| issn | 2304-8158 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Foods |
| spelling | doaj-art-5f23fcdc7e524fb3876187634b953c1e2025-08-20T03:06:29ZengMDPI AGFoods2304-81582025-04-01147127610.3390/foods14071276Preparation of Hydrophobic Purple Sweet Potato-Based Intelligent Packaging Films by Stearic Acid Coating and Heat Pressing TreatmentsXuanzhuo Liu0Fengfeng Xu1Xiaoqian Huang2Jian Sun3Juan Kan4Jun Liu5College of Food Science and Engineering, Yangzhou University, Yangzhou 225127, ChinaCollege of Food Science and Engineering, Yangzhou University, Yangzhou 225127, ChinaCollege of Food Science and Engineering, Yangzhou University, Yangzhou 225127, ChinaXuzhou Institute of Agricultural Sciences in Jiangsu Xuhuai Area, Xuzhou 221131, ChinaCollege of Food Science and Engineering, Yangzhou University, Yangzhou 225127, ChinaCollege of Food Science and Engineering, Yangzhou University, Yangzhou 225127, ChinaThe high hydrophilicity of biopolymer–anthocyanin intelligent packaging films seriously limits their applications in high-humidity environments. Here, a surface hydrophobization technique was adopted to overcome the hydrophilicity of purple sweet potato (PSP)-based intelligent packaging films through stearic acid (SA) coating combined with heat pressing treatments. The structural characteristics, physical properties, and color changeability of the films were investigated. After SA coating treatment, the surface of the films was loosely covered by thick SA layers. As compared with the untreated PSP films, the SA-coated films displayed lower transparency, mechanical property, moisture content, surface wettability, anthocyanin leaching potential, and color changeability. When the SA-coated films were further heat-pressed, the SA-coated layers were closely bound to the films. The heat-pressed films had a higher transparency, mechanical property, and water vapor blocking ability than the SA-coated films. Notably, the color and color changeability of the heat-pressed films were affected by the heat pressing temperature. The films heat-pressed at 100 °C showed a vivid purple color and elevated color changeability, whereas the films heat-pressed at 150 °C showed a brown color and lost color changeability. This study demonstrates that SA coating combined with heat pressing is effective in constructing surface-hydrophobized intelligent packaging films.https://www.mdpi.com/2304-8158/14/7/1276anthocyaninscolor-changeable filmshydrophobic surfacestearic acid coatingheat pressing |
| spellingShingle | Xuanzhuo Liu Fengfeng Xu Xiaoqian Huang Jian Sun Juan Kan Jun Liu Preparation of Hydrophobic Purple Sweet Potato-Based Intelligent Packaging Films by Stearic Acid Coating and Heat Pressing Treatments Foods anthocyanins color-changeable films hydrophobic surface stearic acid coating heat pressing |
| title | Preparation of Hydrophobic Purple Sweet Potato-Based Intelligent Packaging Films by Stearic Acid Coating and Heat Pressing Treatments |
| title_full | Preparation of Hydrophobic Purple Sweet Potato-Based Intelligent Packaging Films by Stearic Acid Coating and Heat Pressing Treatments |
| title_fullStr | Preparation of Hydrophobic Purple Sweet Potato-Based Intelligent Packaging Films by Stearic Acid Coating and Heat Pressing Treatments |
| title_full_unstemmed | Preparation of Hydrophobic Purple Sweet Potato-Based Intelligent Packaging Films by Stearic Acid Coating and Heat Pressing Treatments |
| title_short | Preparation of Hydrophobic Purple Sweet Potato-Based Intelligent Packaging Films by Stearic Acid Coating and Heat Pressing Treatments |
| title_sort | preparation of hydrophobic purple sweet potato based intelligent packaging films by stearic acid coating and heat pressing treatments |
| topic | anthocyanins color-changeable films hydrophobic surface stearic acid coating heat pressing |
| url | https://www.mdpi.com/2304-8158/14/7/1276 |
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