RFID in healthcare is growing rapidly to become a $2.1 billion global business in 2016. Smart packaging for healthcare has additional value, for example in patient compliance recording blister packs that electronicall...RFID in healthcare is growing rapidly to become a $2.1 billion global business in 2016. Smart packaging for healthcare has additional value, for example in patient compliance recording blister packs that electronically record when each pill is taken - or more strictly when it is removed from the pack. Aardex has a different version where the plastic bottle of pills is continuously weighed by a load cell in the base. Thus recording when a pill is removed. These pack-展开更多
Biobased smart packaging is been the most interesting research field.In this study,pH-sensitive films based on anthocyanin molecules from red cabbage and sepiolite mineral nano-clay as functional additives were studie...Biobased smart packaging is been the most interesting research field.In this study,pH-sensitive films based on anthocyanin molecules from red cabbage and sepiolite mineral nano-clay as functional additives were studied.The films were fabricated by casting method of blend polymer Chitosan/Poly(Vinyl Alcohol)at two fillers loading(5wt.%and 10wt.%).The structural,morphological,thermal,optical,hygroscopic,and mechanical properties as well as the pH sensitivity of films were investigated.The thermal properties confirm that the amount of the anthocyanin in sepiolite was around 6.4%.The tensile strength and the young’s modulus of produced composites at 10wt.%sepiolite–anthocyanin content was increased to 8.90 MPa and 163 MPa,respectively.The maximum water absorption that the films may absorb was 12.3%.pH sensitivity analysis showed that the Smart films change the color by changing the pH level,from pink at pH lower than 6 to yellow at pH higher than 6.Thus,the developed pH-sensitive films show band gaps in visible light that make them useful for monitoring milk spoilage.展开更多
Ideally,packaging materials should ensure the safety and quality of foods,without contributing to environmental degradation.Consequently,there is interest in the development of biodegradable films assembled from natur...Ideally,packaging materials should ensure the safety and quality of foods,without contributing to environmental degradation.Consequently,there is interest in the development of biodegradable films assembled from natural materials,such as polysaccharides,proteins,lipids,and their mixtures.In this review,the physicochemical attributes and functional characteristics of biodegradable films prepared from these food-grade natural substances are summarized.Recent advances in the production of active and intelligent packaging materials are also discussed.Active packaging is designed to improve the shelf life of packaged foods by including antimicrobials or antioxidants,such as essential oils.Intelligent packaging is designed to provide real-time information about the quality,freshness,or safety of packaged foods by including indicators in the film that are responsive to changes in storage conditions,gas levels,pH,etc.Potential applications of intelligent and active packaging materials to fruit,vegetable,meat,seafood,and dairy products are discussed.展开更多
Freshness indicating labels embedded with pH-sensitive anthocyanins are one type of smart packaging tech-nology.However,the application of freshness indicating labels is mainly restricted by the high cost and hy-droph...Freshness indicating labels embedded with pH-sensitive anthocyanins are one type of smart packaging tech-nology.However,the application of freshness indicating labels is mainly restricted by the high cost and hy-drophilicity of the labels.In order to reduce the manufacturing cost,passion fruit(Passiflora edulis)peel powder rich in dietary fibers and anthocyanins was used to prepare freshness indicating labels in this study.Moreover,the prepared labels were further soaked in 0.01,0.05 and 0.1 mol/L of stearic acid ethanol solution to increase the hydrophobicity of the labels.Structural characterization results showed the surface of the labels was covered by self-assembled stearic acid crystals.Stearic acid treatment significantly decreased the moisture content(16.90%→10.92%),hydrophilicity(water contact angle of 40.36°→103.01°),water vapor permeability(18.68×10^(-11) g m^(-1) s^(-1) Pa^(-1)→8.10×10^(-11) g m^(-1) s^(-1) Pa^(-1))and water uptake ability of the labels,which effectively prevented the leak of anthocyanins from the labels.In addition,stearic acid treatment greatly elevated the inner compactness of the films,resulting in improved tensile strength(3.12 MPa→6.18 MPa)and thermal stability.Moreover,stearic acid treatment well maintained the pH-dependent color changeable ability of the labels.The labels changed from reddish brown to olive and brown in the application of shrimp freshness indicating.When the labels were buried in natural soil at 20℃ for 10 days,82.74%-98.83%of the labels could be degraded.Therefore,this study provides a new and facile way to prepare freshness indicating labels.展开更多
文摘RFID in healthcare is growing rapidly to become a $2.1 billion global business in 2016. Smart packaging for healthcare has additional value, for example in patient compliance recording blister packs that electronically record when each pill is taken - or more strictly when it is removed from the pack. Aardex has a different version where the plastic bottle of pills is continuously weighed by a load cell in the base. Thus recording when a pill is removed. These pack-
文摘Biobased smart packaging is been the most interesting research field.In this study,pH-sensitive films based on anthocyanin molecules from red cabbage and sepiolite mineral nano-clay as functional additives were studied.The films were fabricated by casting method of blend polymer Chitosan/Poly(Vinyl Alcohol)at two fillers loading(5wt.%and 10wt.%).The structural,morphological,thermal,optical,hygroscopic,and mechanical properties as well as the pH sensitivity of films were investigated.The thermal properties confirm that the amount of the anthocyanin in sepiolite was around 6.4%.The tensile strength and the young’s modulus of produced composites at 10wt.%sepiolite–anthocyanin content was increased to 8.90 MPa and 163 MPa,respectively.The maximum water absorption that the films may absorb was 12.3%.pH sensitivity analysis showed that the Smart films change the color by changing the pH level,from pink at pH lower than 6 to yellow at pH higher than 6.Thus,the developed pH-sensitive films show band gaps in visible light that make them useful for monitoring milk spoilage.
基金This work was supported by Natural Science Foundation of Jiangsu Province(BK20210458,BK20201342)Young Elite Scientists Sponsorship Program by CAST(2021QNRC001).
文摘Ideally,packaging materials should ensure the safety and quality of foods,without contributing to environmental degradation.Consequently,there is interest in the development of biodegradable films assembled from natural materials,such as polysaccharides,proteins,lipids,and their mixtures.In this review,the physicochemical attributes and functional characteristics of biodegradable films prepared from these food-grade natural substances are summarized.Recent advances in the production of active and intelligent packaging materials are also discussed.Active packaging is designed to improve the shelf life of packaged foods by including antimicrobials or antioxidants,such as essential oils.Intelligent packaging is designed to provide real-time information about the quality,freshness,or safety of packaged foods by including indicators in the film that are responsive to changes in storage conditions,gas levels,pH,etc.Potential applications of intelligent and active packaging materials to fruit,vegetable,meat,seafood,and dairy products are discussed.
基金funded by National Natural Science Foundation of China(31571788)Self-developing Instrument and Equipment Project of Yangzhou University(zzyq2022zy20).
文摘Freshness indicating labels embedded with pH-sensitive anthocyanins are one type of smart packaging tech-nology.However,the application of freshness indicating labels is mainly restricted by the high cost and hy-drophilicity of the labels.In order to reduce the manufacturing cost,passion fruit(Passiflora edulis)peel powder rich in dietary fibers and anthocyanins was used to prepare freshness indicating labels in this study.Moreover,the prepared labels were further soaked in 0.01,0.05 and 0.1 mol/L of stearic acid ethanol solution to increase the hydrophobicity of the labels.Structural characterization results showed the surface of the labels was covered by self-assembled stearic acid crystals.Stearic acid treatment significantly decreased the moisture content(16.90%→10.92%),hydrophilicity(water contact angle of 40.36°→103.01°),water vapor permeability(18.68×10^(-11) g m^(-1) s^(-1) Pa^(-1)→8.10×10^(-11) g m^(-1) s^(-1) Pa^(-1))and water uptake ability of the labels,which effectively prevented the leak of anthocyanins from the labels.In addition,stearic acid treatment greatly elevated the inner compactness of the films,resulting in improved tensile strength(3.12 MPa→6.18 MPa)and thermal stability.Moreover,stearic acid treatment well maintained the pH-dependent color changeable ability of the labels.The labels changed from reddish brown to olive and brown in the application of shrimp freshness indicating.When the labels were buried in natural soil at 20℃ for 10 days,82.74%-98.83%of the labels could be degraded.Therefore,this study provides a new and facile way to prepare freshness indicating labels.
