Food spoilage causes massive waste and safety risks,demanding eco-friendly packaging.Conventional paper coatings use nondegradable plastics/hazardous solvents,whereas biobased coatings lack water resistance and have h...Food spoilage causes massive waste and safety risks,demanding eco-friendly packaging.Conventional paper coatings use nondegradable plastics/hazardous solvents,whereas biobased coatings lack water resistance and have high bacterial adhesion.To solve this problem,an all-water-based,fluorine-free bilayer coating was developed for superhydrophobic,oil-resistant paper(SS-ABC):sodium alginate(SA)/soy protein isolate(SPI)base layer for oil repellency,and alkyl ketene dimer(AKD)/bamboo powder(BP)/carboxycellulose nanofiber(C-CNF)top layer for superhydrophobicity.SS-ABC showed superhydrophobicity(water contact angle:156.80±0.44°;Cobb60:14.89±0.70 g/m^(2)),water sliding angle(16.48±0.68°),and oil resistance(Kit rating:10/12;oil contact angle:100.25±0.72°),meeting GB/T 44834-2024.It reduced E.coli/S.aureus adhesion by 83.78%/84.90% compared with uncoated paper,maintained stability under 95◦C hot water/oil and 80 abrasion cycles,and complied with GB 31604.1-2023(migration≤10 mg/dm^(2)).Mechanistically,SA/SPI interactions and Ca2+crosslinking enhanced the oil barrier performance;AKD recrystallized into platelets(with C-CNF/BP acting as supports)for dual-scale roughness,with AKD alkyl chains lowering the surface energy.This strategy enables biodegradable and recyclable paper,offering a green food packaging solution to reduce waste and improve in-dustry sustainability.展开更多
Superheated steam(SHS)treatment is increasingly recognised as an emerging thermal sterilisation technology in food processing because of its high energy efficiency,time-saving benefits and minimal quality loss in raw ...Superheated steam(SHS)treatment is increasingly recognised as an emerging thermal sterilisation technology in food processing because of its high energy efficiency,time-saving benefits and minimal quality loss in raw materials.The aim of this study was to examine the efficacy of SHS treatment as a high-temperature pretreatment approach for eliminating foodborne pathogens on the surface of pork belly and to determine its impact on nutritional quality.The SHS treatment at 180℃ and 25 kg h^(-1) for 50 s achieved sterilisation rates of 98.15%±1.70%,96.59%±1.40% and 91.30%±2.14% for Salmonella typhimurium,Listeria monocytogenes and Staphylococcus aureus,respectively,which were three times higher than those achieved by microwave(MIC)sterilisation(700 W,20 s).Furthermore,SHS-treated pork belly exhibited the highest moisture content and lowest cooking loss,with no significant changes in pressing loss and pH values.Compared with samples treated with MIC and blanching(99℃±1℃,2 min),those treated with SHS showed significantly lower TBARS value and protein carbonyl content,with an increasing trend in L*values.Meanwhile,SHS treatment not only preserved the tenderness of the pork belly to the greatest extent but also yielded the highest sensory score of 7.81 out of 9.These findings indicate the potential of SHS treatment in producing premium-quality pasteurised pork belly.展开更多
基金supported by the Jiangsu Provincial Key Laboratory of Food Advanced Manufacturing Equipment Technology(Grant number:FMZ201905).
文摘Food spoilage causes massive waste and safety risks,demanding eco-friendly packaging.Conventional paper coatings use nondegradable plastics/hazardous solvents,whereas biobased coatings lack water resistance and have high bacterial adhesion.To solve this problem,an all-water-based,fluorine-free bilayer coating was developed for superhydrophobic,oil-resistant paper(SS-ABC):sodium alginate(SA)/soy protein isolate(SPI)base layer for oil repellency,and alkyl ketene dimer(AKD)/bamboo powder(BP)/carboxycellulose nanofiber(C-CNF)top layer for superhydrophobicity.SS-ABC showed superhydrophobicity(water contact angle:156.80±0.44°;Cobb60:14.89±0.70 g/m^(2)),water sliding angle(16.48±0.68°),and oil resistance(Kit rating:10/12;oil contact angle:100.25±0.72°),meeting GB/T 44834-2024.It reduced E.coli/S.aureus adhesion by 83.78%/84.90% compared with uncoated paper,maintained stability under 95◦C hot water/oil and 80 abrasion cycles,and complied with GB 31604.1-2023(migration≤10 mg/dm^(2)).Mechanistically,SA/SPI interactions and Ca2+crosslinking enhanced the oil barrier performance;AKD recrystallized into platelets(with C-CNF/BP acting as supports)for dual-scale roughness,with AKD alkyl chains lowering the surface energy.This strategy enables biodegradable and recyclable paper,offering a green food packaging solution to reduce waste and improve in-dustry sustainability.
基金financially supported by National Key Research and Development Program of China(2022YFD2100305).
文摘Superheated steam(SHS)treatment is increasingly recognised as an emerging thermal sterilisation technology in food processing because of its high energy efficiency,time-saving benefits and minimal quality loss in raw materials.The aim of this study was to examine the efficacy of SHS treatment as a high-temperature pretreatment approach for eliminating foodborne pathogens on the surface of pork belly and to determine its impact on nutritional quality.The SHS treatment at 180℃ and 25 kg h^(-1) for 50 s achieved sterilisation rates of 98.15%±1.70%,96.59%±1.40% and 91.30%±2.14% for Salmonella typhimurium,Listeria monocytogenes and Staphylococcus aureus,respectively,which were three times higher than those achieved by microwave(MIC)sterilisation(700 W,20 s).Furthermore,SHS-treated pork belly exhibited the highest moisture content and lowest cooking loss,with no significant changes in pressing loss and pH values.Compared with samples treated with MIC and blanching(99℃±1℃,2 min),those treated with SHS showed significantly lower TBARS value and protein carbonyl content,with an increasing trend in L*values.Meanwhile,SHS treatment not only preserved the tenderness of the pork belly to the greatest extent but also yielded the highest sensory score of 7.81 out of 9.These findings indicate the potential of SHS treatment in producing premium-quality pasteurised pork belly.
