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U. Holzgrabe

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Articles by U. Holzgrabe

Too much or too little caffeine? Determination of content in thermogenic capsules by quantitative 1H nuclear magnetic resonance (qNMR)

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By U. Holzgrabe, EFSA Panel, C. Wilson, E.A. Bykowski
| ScienceDirect Verified
Caffeine-based supplements have become widely available and are commonly used in conjunction with pre-workout formulas or simply to help individuals maintain their energy levels. In addition to caffeine, these supplements may also include other ingredients such as catechins, synephrine, and ephedrine. However, it is important to note that these products often lack rigorous quality control, which can lead to variations in potency and safety [1].
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Development of pH-Adjusted NMR Methodology for Quantitation of Caffeoylquinic Acid Derivatives and Evaluation of their Antimalignant Pleural Mesothelioma Potential

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By U. Holzgrabe, K. Freudenberg
| ScienceDirect Verified
Available online 25 February 2025, 116776 Development of pH-Adjusted NMR Methodology for Quantitation of Caffeoylquinic Acid Derivatives and Evaluation of their Antimalignant Pleural Mesothelioma Potential Author links open overlay panelHau Thi Hong Bui a 1 , Yoon-Jin Lee b 1 , Trung Huy Ngo a 1 , Punam Thapa a , Yun-Seo Kil a c , Chang Yeol Lee b , Hyukjae Choi a d , Kyu Joon Lee e , Joo-Won Nam a Show more Highlights • Structural similarity and isomerization of CQAs make quantitation...
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Application of Quantitative NMR in Pharmaceutical Analysis: Method Qualification and Potency Determination for Two New Chemical Entities in Early-Stage Clinical Studies

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By U. Holzgrabe
| ScienceDirect Verified
Introduction A critical task in pharmaceutical analysis is to determine the %wt/wt potency of a new chemical entity (NCE), which will be used for subsequent analytical tests for research/GLP/GMP batches and could have a significant impact on the testing results. Under most circumstances the potency is derived from an LC-based subtraction method based upon the test results obtained from various analytical technologies [1].
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