The authors thank Thomas Layloff, Senior Quality Assurance Advisor, Supply Chain Management System (SCMS), Arlington, VA, USA for his support of this research and review of the article prior to its submission for publication. We also thank EMD Millipore Corp. for providing the Premium Purity glass HPTLC plates used in our experiments. Danhui Zhang and Ellen Armour were supported by a Camille and Henry Dreyfus Foundation Senior Scientist Mentor Program awarded to Professor Joseph Sherma.
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