Active packaging based on biomaterials and essential oils is an alternate for plastic ones.But,essential oils are chemically and physiologically labile,and they have strong scents,limiting their use as antimicrobial a...Active packaging based on biomaterials and essential oils is an alternate for plastic ones.But,essential oils are chemically and physiologically labile,and they have strong scents,limiting their use as antimicrobial additives in food.Thus,in this investigation,basil oil was encapsulated in silica nanoparticles(basil oil@SiNPs)and combined with chitosan films(basil oil@SiNPs@chitosan).Scanning electron microscopy(SEM),Transmission electron microscopy(TEM),X-ray diffraction(XRD),surface area and Brunauer-Emmett-Teller(BET)analysis,encapsulation and loading%were used to evaluate basil oil@SiNPs.The surface area of SiNPs decreased from 59.006 to 43.86 cm^(2)/g due to basil oil encapsulation.The encapsulation and loading%were 81.96,65.87,48.48 and 43.13,37.64,33.44%for 2,1.5,and 1 mL of basil oil,respectively.Fourier-transform infrared(FT-IR),XRD,thermogravimetric analysis(TG),mechanical,wettability,water vapor permeability(WVP),oxygen permeability(OP)features;water vapor sorption isotherms and antimicrobial inhibition tests were used to describe the produced basil oil@SiNPs@chitosan films.Water contact angles and activation energy increased from 89.0◦to 110.9◦and-11.97 to-20.40 kJ/mol,respectively after addition of basil oil@SiNPs.However,WVP decreased from 5.9580×10^(-1)±0.33 to 4.2413×10^(-1)±0.55 g.mm.m^(-2).h^(-1).kPa^(-1)and OP increased from 4.094×10^(-4)±0.52 to 6.715×10^(-5)±0.32(g.m^(-2).day^(-1).atm^(-1)).The four models Guggenheim-Anderson-de Boer(GAB),Smith,Henderson and SIPSI were suitable for describing the moisture sorption of basil oil@SiNPs@chitosan films.Basil oil@SiNPs has antimicrobial inhibition against Gram positive and negative bacteria,pathogenic yeast.展开更多
Currently,the necessity to diminish environmental pollution caused by petroleum-based packaging plastics has encouraged interest in creating renewable and biodegradable packaging polymers.The objective of this study i...Currently,the necessity to diminish environmental pollution caused by petroleum-based packaging plastics has encouraged interest in creating renewable and biodegradable packaging polymers.The objective of this study is the development of a green nanocomposite constructed from citrate cellulose nanospheres(CNC)that have been embedded in(CH/AG)Chitosan/Arabic gum(CNC@CH/AG)to meet the mechanical requirements.Citrate CNC was prepared using a citric acid/HCl acid mixture and it is investigated by Fourier-transform infrared spectroscopy(FTIR),X-ray diffraction(XRD),Transmission electron microscopy(TEM),Zeta potential,and degree of substitution.CNC@CH/AG film was investigated by FTIR,XRD,scanning electron microscope(SEM),wettability,mechanical,barrier,water vapor sorption,and thermal characteristics.CNC@CH/AG film displayed declining in water vapor permeability.The lowest water vapor permeability(WVP)value was 0.044±23×10^(-3)g.mm.kPa^(-1).h^(-1).m^(-2)compared with control(CH/AG)was 0.129±81×10^(-3)up to^(-3)mg CNC.For sorption properties,the CNC@CH/AG nanocomposite films are consistent with the GAB model,Smith,Henderson,and Peleg models.In comparison to CH/AG,the addition of CNC enhances all of the nanocomposites’tensile strength and Young’s modulus by nearly two and three times,respectively,with a decrease in elongation percentage.The addition of CNC renders CNC@CH/AG nanocomposite films more thermally stable and the total activation energy of CNC@CH/AG nanocomposite film(-94.97 J/mol)is more than three times that CH/AG film(-34.04 J/mole).展开更多
文摘Active packaging based on biomaterials and essential oils is an alternate for plastic ones.But,essential oils are chemically and physiologically labile,and they have strong scents,limiting their use as antimicrobial additives in food.Thus,in this investigation,basil oil was encapsulated in silica nanoparticles(basil oil@SiNPs)and combined with chitosan films(basil oil@SiNPs@chitosan).Scanning electron microscopy(SEM),Transmission electron microscopy(TEM),X-ray diffraction(XRD),surface area and Brunauer-Emmett-Teller(BET)analysis,encapsulation and loading%were used to evaluate basil oil@SiNPs.The surface area of SiNPs decreased from 59.006 to 43.86 cm^(2)/g due to basil oil encapsulation.The encapsulation and loading%were 81.96,65.87,48.48 and 43.13,37.64,33.44%for 2,1.5,and 1 mL of basil oil,respectively.Fourier-transform infrared(FT-IR),XRD,thermogravimetric analysis(TG),mechanical,wettability,water vapor permeability(WVP),oxygen permeability(OP)features;water vapor sorption isotherms and antimicrobial inhibition tests were used to describe the produced basil oil@SiNPs@chitosan films.Water contact angles and activation energy increased from 89.0◦to 110.9◦and-11.97 to-20.40 kJ/mol,respectively after addition of basil oil@SiNPs.However,WVP decreased from 5.9580×10^(-1)±0.33 to 4.2413×10^(-1)±0.55 g.mm.m^(-2).h^(-1).kPa^(-1)and OP increased from 4.094×10^(-4)±0.52 to 6.715×10^(-5)±0.32(g.m^(-2).day^(-1).atm^(-1)).The four models Guggenheim-Anderson-de Boer(GAB),Smith,Henderson and SIPSI were suitable for describing the moisture sorption of basil oil@SiNPs@chitosan films.Basil oil@SiNPs has antimicrobial inhibition against Gram positive and negative bacteria,pathogenic yeast.
基金supported by National Research Centre(NRC),Cairo,Egypt and has been provided with funding support(NRC).
文摘Currently,the necessity to diminish environmental pollution caused by petroleum-based packaging plastics has encouraged interest in creating renewable and biodegradable packaging polymers.The objective of this study is the development of a green nanocomposite constructed from citrate cellulose nanospheres(CNC)that have been embedded in(CH/AG)Chitosan/Arabic gum(CNC@CH/AG)to meet the mechanical requirements.Citrate CNC was prepared using a citric acid/HCl acid mixture and it is investigated by Fourier-transform infrared spectroscopy(FTIR),X-ray diffraction(XRD),Transmission electron microscopy(TEM),Zeta potential,and degree of substitution.CNC@CH/AG film was investigated by FTIR,XRD,scanning electron microscope(SEM),wettability,mechanical,barrier,water vapor sorption,and thermal characteristics.CNC@CH/AG film displayed declining in water vapor permeability.The lowest water vapor permeability(WVP)value was 0.044±23×10^(-3)g.mm.kPa^(-1).h^(-1).m^(-2)compared with control(CH/AG)was 0.129±81×10^(-3)up to^(-3)mg CNC.For sorption properties,the CNC@CH/AG nanocomposite films are consistent with the GAB model,Smith,Henderson,and Peleg models.In comparison to CH/AG,the addition of CNC enhances all of the nanocomposites’tensile strength and Young’s modulus by nearly two and three times,respectively,with a decrease in elongation percentage.The addition of CNC renders CNC@CH/AG nanocomposite films more thermally stable and the total activation energy of CNC@CH/AG nanocomposite film(-94.97 J/mol)is more than three times that CH/AG film(-34.04 J/mole).
