方案摘要
方案下载| 应用领域 | 食品/农产品 |
| 检测样本 | 液体乳 |
| 检测项目 | 前处理 |
| 参考标准 | GB 5009.205-2013 食品中二噁英及其类似物毒性当量的测定； |
We have utilized an automated acid hydrolysis technology, followed by an abbreviated Soxhlet extraction technique to obtain fat from whole milk for the determination of persistent organic pollutants, namely polychlorinated dibenzo-p-dioxins, polychlorinated dibenzofurans and polychlorinated biphenyls. The process simply involves (1) pouring the liquid milk into the hydrolysis beaker with reagents and stan- dards, (2) drying the obtained fat on a filter paper and (3) obtaining pure fat via the modified Soxhlet extraction using 100 mL of hexane per sample. This technique is in contrast to traditional manually intense liquid-liquid extractions and avoids the preparatory step of freeze-drying the samples for pressurized liquid extractions. Along with these extraction improvements, analytical results closely agree between the methods, thus no quality has been compromised. The native spike (n = 12) and internal standard (n = 24) precision and accuracy results are within EPA Methods 1613 and 1668 limits. While the median (n = 6) Toxic Equivalency Quotient (TEQ) for polychlorinated dibenzo-p-dioxins/polychlorinated diben- zofurans and the concentration of the marker polychlorinated biphenyls show a percent difference of 1% and 12%, respectively, compared to 315 previously analyzed milk samples at the same laboratory using liquid-liquid extraction. During our feasibility studies, both egg and fish tissue show substantial promise using this technique as well
We have utilized an automated acid hydrolysis technology, followed by an abbreviated Soxhlet extraction technique to obtain fat from whole milk for the determination of persistent organic pollutants, namely polychlorinated
dibenzo-p-dioxins, polychlorinated dibenzofurans and polychlorinated biphenyls. The
process simply involves (1) pouring the liquid milk into the hydrolysis beaker with reagents and stan-dards, (2) drying the obtained fat on a filter paper and (3) obtaining pure fat via the modified Soxhlet extraction using 100 mL of hexane per sample. This technique is in contrast to traditional manually intense liquid-liquid extractions and avoids the preparatory step of freeze-drying the samples for pressurized liquid
extractions. Along with these extraction improvements, analytical results closely agree between the methods, thus no quality has been compromised. The native spike (n = 12) and internal standard (n= 24) precision and accuracy results are within EPA Methods 1613 and 1668 limits. While the median (n= 6) Toxic Equivalency Quotient (TEQ) for polychlorinated dibenzo-p-dioxins/polychlorinated diben-zofurans
and the concentration of the marker polychlorinated biphenyls show a percent difference of 1% and12%, respectively, compared to 315 previously analyzed milk samples at the same laboratory usingliquid-liquid extraction. During our feasibility studies, both egg and fish tissue show substantial promise using this technique as well
六种李子中蛋白质和膳食纤维的测定
原污水和净化后污水中氨氮、总氮、化学需氧量及生物过滤器、根、茎、叶、叶面中多环芳烃PAHs的测定
两个不同年份收获的苜蓿绿汁中蛋白质的测定
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