Mailinda Ayu Hana Margareta (Universitas Negeri Malang, Indonesia)
Abstract: The increasing demand for rapid and cost-effective analytical methods for coffee quality assessment has highlighted the need for accessible techniques capable of probing molecular behavior in complex coffee matrices. Although high field Nuclear Magnetic Resonance (NMR) spectroscopy is the standard approach for spin lattice relaxation (T₁) measurements, its widespread use remains limited by high acquisition costs and specialized infrastructure requirements. This study evaluates the capability of an 80 MHz Benchtop NMR system to perform T₁ measurements directly in coffee extracts. Building upon an established relaxation delay (d1) optimization protocol, inversion recovery experiments were conducted, and relaxation curves were analyzed using nonlinear fitting to determine T₁ values for resolved proton resonances in the coffee extracts. The results demonstrate that the Benchtop NMR system successfully generated reliable relaxation curves and accurately determined distinct T₁ values for multiple proton resonances within the complex coffee matrix. The reproducibility of the fitting results indicates that the 80 MHz Benchtop NMR possesses sufficient sensitivity and stability for molecular relaxation studies despite its relatively low magnetic field strength. These findings demonstrate the feasibility of employing Benchtop NMR as an accessible analytical platform for routine T₁ measurements in coffee extracts and support its potential application in molecular characterization and quality assessment within the coffee industry.
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