The purpose of this work is to develop a new type of intelligent indicating label with high sensitivity to volatile bioamine,anti-ultraviolet light and anti-pigment leakage characteristics by electrospinning for real-...The purpose of this work is to develop a new type of intelligent indicating label with high sensitivity to volatile bioamine,anti-ultraviolet light and anti-pigment leakage characteristics by electrospinning for real-time visual monitoring the freshness of cold fresh pork.By investigating pH discoloration sensitivity and light stability of plant pigments with different structures,mulberry pigment was selected as the indicator of indicating label.The content of label components(mulberry pigment,polylactic acid and TiO_(2) nanoparticle)significantly affected label performance(light stability,responsiveness to trimethylamine,and anti-leakage of mulberry pigment),and the optimal component content was determined to be 6.01%(w/w)of polylactic acid,0.62%(w/w)of TiO_(2) nanoparticles and 0.29%(w/w)of mulberry pigment by response surface test based on label performance as response value.A close correlation(the correlation coefficient R values of 0.86-0.97)between the total color difference(ΔE)of the label and the freshness indexes(total plate count,total volatile basic nitrogen content,pH,thiobarbituric acid value and sensory score)of cold fresh pork during cold storage was revealed,and the freshness level of unknown pork samples could be well quantitatively predicted by partial least squares regression models with the determination coefficient(R^(2))values of 0.89-0.92,facilitating producers,dealers and consumers to know pork quality promptly.展开更多
Intelligent indicator labels have been widely demonstrated as functional material to real-time monitor the freshness of food,whereas the migration problem of natural pH-sensitive dyes from the matrix into surface of p...Intelligent indicator labels have been widely demonstrated as functional material to real-time monitor the freshness of food,whereas the migration problem of natural pH-sensitive dyes from the matrix into surface of packaging film restricted the practical application.Herein,a facile in situ encapsulation strategy was proposed to design and fabricate soybean protein isolate(SPI)/carboxymethyl cellulose sodium(CMC)/anthocyanin(Anth)(SCA)composite film as smart labels to monitor the freshness of protein-based foods.Inspired by the stimulation-response behaviors of Mimosa,Anth was in situ wrapped by the spatial structural mutation of SPI chains driven by different pH conditions,in which tannic acid(TA)served as pH modulator.Compared to CMC/Anth composite film free of pH modulation,the cumulative release of Anth from SCA-7.0 composite film was decreased from 90.97%,82.45%and 70.52%to 64.14%,53.88%and 39.45%in distilled water,10%ethanol and 90%ethanol,respectively.Furthermore,the prepared SCA-7.0 composite film possessed reinforced UV-shielding,gas barrier and water resistance performances.When employed as intelligent label,this composite film can be an intelligent indicator label for real-time meat freshness monitoring.A facile strategy was carried out to in situ encapsulate the Anth within matrix,boosting the reliability and lifespan of intelligent packaging in practical application.展开更多
基金supported by National Natural Science Foundation of China(32272446,31801506)Key Research and Development Program Funded by Shaanxi Provincial Science and Technology Department(2022NY-223)+1 种基金Natural Science Basic Research Program Funded by Shaanxi Provincial Science and Technology Department(2023-JC-YB-146)Agricultural Technology Research Program Funded by Xi’an Science and Technology Bureau(21NYYF0058,22NYYF057).
文摘The purpose of this work is to develop a new type of intelligent indicating label with high sensitivity to volatile bioamine,anti-ultraviolet light and anti-pigment leakage characteristics by electrospinning for real-time visual monitoring the freshness of cold fresh pork.By investigating pH discoloration sensitivity and light stability of plant pigments with different structures,mulberry pigment was selected as the indicator of indicating label.The content of label components(mulberry pigment,polylactic acid and TiO_(2) nanoparticle)significantly affected label performance(light stability,responsiveness to trimethylamine,and anti-leakage of mulberry pigment),and the optimal component content was determined to be 6.01%(w/w)of polylactic acid,0.62%(w/w)of TiO_(2) nanoparticles and 0.29%(w/w)of mulberry pigment by response surface test based on label performance as response value.A close correlation(the correlation coefficient R values of 0.86-0.97)between the total color difference(ΔE)of the label and the freshness indexes(total plate count,total volatile basic nitrogen content,pH,thiobarbituric acid value and sensory score)of cold fresh pork during cold storage was revealed,and the freshness level of unknown pork samples could be well quantitatively predicted by partial least squares regression models with the determination coefficient(R^(2))values of 0.89-0.92,facilitating producers,dealers and consumers to know pork quality promptly.
基金supported by the National Key Research and Development Program of China(2022YFD2100105)the National Natural Science Foundation of China(No.21978029,No.22278047,No.22208038 and No.22208040)Liaoning Revitalization Talents Program(XLYC2002024).
文摘Intelligent indicator labels have been widely demonstrated as functional material to real-time monitor the freshness of food,whereas the migration problem of natural pH-sensitive dyes from the matrix into surface of packaging film restricted the practical application.Herein,a facile in situ encapsulation strategy was proposed to design and fabricate soybean protein isolate(SPI)/carboxymethyl cellulose sodium(CMC)/anthocyanin(Anth)(SCA)composite film as smart labels to monitor the freshness of protein-based foods.Inspired by the stimulation-response behaviors of Mimosa,Anth was in situ wrapped by the spatial structural mutation of SPI chains driven by different pH conditions,in which tannic acid(TA)served as pH modulator.Compared to CMC/Anth composite film free of pH modulation,the cumulative release of Anth from SCA-7.0 composite film was decreased from 90.97%,82.45%and 70.52%to 64.14%,53.88%and 39.45%in distilled water,10%ethanol and 90%ethanol,respectively.Furthermore,the prepared SCA-7.0 composite film possessed reinforced UV-shielding,gas barrier and water resistance performances.When employed as intelligent label,this composite film can be an intelligent indicator label for real-time meat freshness monitoring.A facile strategy was carried out to in situ encapsulate the Anth within matrix,boosting the reliability and lifespan of intelligent packaging in practical application.
