目的建立同时测定药品塑料包装材料中BHA;BHT;Irganox1076;Irganox1010和Irgafos168五种抗氧剂含量的高效液相色谱法。方法色谱柱为phenomenex EVO C_(18)柱子(250mm×4.6mm,5μm),以乙腈-水为流动相进行梯度洗脱,检测波长200nm,流...目的建立同时测定药品塑料包装材料中BHA;BHT;Irganox1076;Irganox1010和Irgafos168五种抗氧剂含量的高效液相色谱法。方法色谱柱为phenomenex EVO C_(18)柱子(250mm×4.6mm,5μm),以乙腈-水为流动相进行梯度洗脱,检测波长200nm,流速为1.0mL/min。结果五种抗氧剂浓度在1.0～10.0μg/mL范围内与其峰面积呈良好线性关系,r值均大于0.997,平均回收率为116.0%。结论该方法简便、准确、重复性好,可用于药品塑料包装材料中抗氧剂的含量测定。展开更多
Thermal cracking occurs in the plastic packaging materials due to the presence of moisturized micro-cavities in the material.The moisture resident in the micro-cavities gives rise to the internal vapor pressure that d...Thermal cracking occurs in the plastic packaging materials due to the presence of moisturized micro-cavities in the material.The moisture resident in the micro-cavities gives rise to the internal vapor pressure that drives the thermal expansion of micro-cavities as temperature rises.The plastic packaging materials are considered a class of thermo-hyperelastic materials,thus allowing the micro-cavities to thermally expand to the substantial extent before the cracking failure.The micro-cavities can be moisture-abundant(i.e.,wet) or substantially dry when cracking occurs.Cracking appears to be almost certain in the presence of wet cavities.The possibility of cracking in dry cavities turns to be two-sided:when the initial volume fraction of the micro-cavities is relatively small,cracking cannot occur in the dry cavities regardless of the phase transition temperature;when the initial cavity volume fraction is relatively large,cracking tends to occur in the dry cavities especially when the phase transition temperature is large.Because of the two-sided cracking possibility,the dry-cavity cracking mode presents a scenario that might reveal the mechanism of popcorning-type cracking failure in plastic packaging materials.展开更多
文摘目的建立同时测定药品塑料包装材料中BHA;BHT;Irganox1076;Irganox1010和Irgafos168五种抗氧剂含量的高效液相色谱法。方法色谱柱为phenomenex EVO C_(18)柱子(250mm×4.6mm,5μm),以乙腈-水为流动相进行梯度洗脱,检测波长200nm,流速为1.0mL/min。结果五种抗氧剂浓度在1.0～10.0μg/mL范围内与其峰面积呈良好线性关系,r值均大于0.997,平均回收率为116.0%。结论该方法简便、准确、重复性好,可用于药品塑料包装材料中抗氧剂的含量测定。
基金supported by the National Natural Science Foundation of China (Grant No. 11172195)the Natural Science Foundation of Shanxi Province,China (Grant No. 2012011019-4)
文摘Thermal cracking occurs in the plastic packaging materials due to the presence of moisturized micro-cavities in the material.The moisture resident in the micro-cavities gives rise to the internal vapor pressure that drives the thermal expansion of micro-cavities as temperature rises.The plastic packaging materials are considered a class of thermo-hyperelastic materials,thus allowing the micro-cavities to thermally expand to the substantial extent before the cracking failure.The micro-cavities can be moisture-abundant(i.e.,wet) or substantially dry when cracking occurs.Cracking appears to be almost certain in the presence of wet cavities.The possibility of cracking in dry cavities turns to be two-sided:when the initial volume fraction of the micro-cavities is relatively small,cracking cannot occur in the dry cavities regardless of the phase transition temperature;when the initial cavity volume fraction is relatively large,cracking tends to occur in the dry cavities especially when the phase transition temperature is large.Because of the two-sided cracking possibility,the dry-cavity cracking mode presents a scenario that might reveal the mechanism of popcorning-type cracking failure in plastic packaging materials.
