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Near-Infrared (NIR) Spectrometry as a Fast and Reliable Tool for Fat and Moisture Analyses in Olives
摘要： The evaluation of fat and moisture contents for olive fruits is crucial for both olive growers and olive oil processors. Reference methods, such as Soxhlet extraction, used for fat content determination in olive fruits are time- and solvent- consuming and labor intensive. Near-infrared (NIR) spectroscopy is proposed as a solution toward rapid and nondestructive analyses of olive fruit fat and moisture contents. In the present work, comparative studies of the fat and moisture quantification methods were performed on four cultivars (Arbosana, Arbequina, Chiquitita, and Koroneiki) during six different harvesting time points to determine the potential of NIR as an alternative methodology. The impact of olive paste crushing degree on NIR performance was also investigated using three different grid sizes (4, 6, and 8 mm) on a hammer mill, in addition to a blade crusher. Results indicate a satisfactory correlation between the reference Soxhlet and NIR methods with R2 = 0.995. A comparison study of moisture content was also done on NIR and the use of conventional oven with the R2 value of 0.995. The crushing blade produced higher values in both moisture and fat contents in comparison to the hammer mill. The evaluation indicates that when building a chemometric model, all crush sizes and blade sizes should be represented in the model for highest accuracy.
关键词： Soxhlet extraction,Near-infrared (NIR) spectroscopy,moisture content,olive fruit,fat content,chemometric model
更新于2025-09-04 15:30:14
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NIR spectroscopy research in the Ozaki group for the last 30 years
摘要： The purpose of this article is to introduce NIR spectroscopy research in the Ozaki group for the last 30 years. It might be interesting for some readers to know how and why our group pursued NIR spectroscopy for the last three decades. Perhaps, the readers can learn research purpose, research direction, strategy and tactics of NIR studies of our lab. For the last 30 years or so NIR spectroscopy has made fantastic progress in theory, instrumentation, spectral analysis, and application. Thus, the history of the Ozaki group strongly reflects the history of NIR spectroscopy. We have run after the rapid progress of NIR spectroscopy, and at the same time, probably we have created some novel advances of NIR spectroscopy.
关键词： NIR spectroscopy,research history,spectral analysis,instrumentation,Ozaki group
更新于2025-09-04 15:30:14