Determination of Xylitol in Sugar-Free Gum by GC MS with Direct Aqueous Injection: A Laboratory Experiment for Chemistry Students 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Journal of Chemical Education
年/卷/期
2018 / 95 / 11
页码
2017-2022
ISSN号
0021-9584
作者单位
Mississippi State Univ, Dept Chem, Mississippi State, MS 39762 USA;Mississippi State Univ, Dept Chem, Mississippi State, MS 39762 USA;Mississippi State Univ, Dept Chem, Mississippi State, MS 39762 USA;Mississippi State Univ, Dept Chem, Mississippi State, MS 39762 USA;Mississippi State Univ, Dept Chem, Mississippi State, MS 39762 USA;Mississippi State Univ, Dept Chem, Mississippi State, MS 39762 USA;Ohio State Univ, Small Anim Emergency & Crit Care, Vet Med Ctr, Columbus, OH 43210 USA;Mississippi State Univ, Coll Vet Med, Mississippi State, MS 39762 USA;Mississippi State Univ, Coll Vet Med, Mississippi State, MS 39762 USA;
作者
Mlsna, Todd;Mlsna, Deb;Samarasekara, Dulani;Brown, John Charles;Howard, Leslie;Rajapaksha, Suranga M.;Gerken, Katherine;Archer, Todd;Lathan, Patty;
摘要
Proficiency with instrumental analysis via GC-MS is an important skill for chemistry students. The application of analytical techniques and fundamental theoretical principles to real-world problems can be valuable learning exercises for undergraduates which can also improve their analytical thinking skills. Xylitol is generally considered safe for human consumption and is frequently used in sugar-free gum; however, it is extremely toxic to dogs. In this laboratory experiment, upper-level undergraduate chemistry students extract xylitol from both fresh and chewed gum sticks followed by direct aqueous injection GC-MS analysis. Students learn the proper steps and techniques required for sample extraction and preparation and GC-MS analysis, and they determine concentrations of xylitol present in gum samples. Identification and quantification of the chemical components in gum extract occurs via GC-MS analysis; however, other GC detectors could be used. Students also compare external and internal standard calibration methods for xylitol quantification. Upon quantification of xylitol in chewed and unchewed gum samples, students are able to calculate the level of hazard for dogs upon ingestion.
机翻摘要
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关键词/主题词
Upper-Division Undergraduate;Hands-On Learning/Manipulatives;Alcohols;Mass Spectrometry;Green Chemistry;Organic Chemistry;
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