NIR Spectroscopy Applications for Internal and External Quality Analysis of Citrus Fruit—A Review

• Published in: Food and bioprocess technology Vol. 5; no. 2; pp. 425 - 444
• Main Authors: Magwaza, Lembe S., Opara, Umezuruike Linus, Nieuwoudt, Hélène, Cronje, Paul J. R., Saeys, Wouter, Nicolaï, Bart
• Format: Journal Article
• Language: English
• Published: New York Springer-Verlag 01.02.2012; Springer Nature B.V
• Subjects: Agribusiness; Agriculture; Applications programs; Biotechnology; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Chemometrics; Citrus fruits; Destructive testing; Food Science; Fruits; Hyperspectral imaging; Instrumentation; Measuring instruments; Near infrared radiation; Nondestructive testing; Optical Coherence Tomography; Quality; Quality assessment; Quality assurance; Quality control; Quality management; Review Paper; Reviews; Spectroscopy; Spectrum analysis; Subjective assessment; X-ray computed tomography (CT); Non-destructive evaluation; Citrus fruit; Internal quality; Hyperspectral; NIRS; Multispectral; Optical coherence tomography (OCT); Near-infrared spectroscopy; External quality
• ISSN: 1935-5130; 1935-5149
• DOI: 10.1007/s11947-011-0697-1

The global citrus industry is continually confronted by new technological challenges to meet the ever-increasing consumer awareness and demand for quality-assured fruit. To face these challenges, recent trend in agribusiness is declining reliance on subjective assessment of quality and increasing adoption of objective, quantitative and non-destructive techniques of quality assessment. Non-destructive instrument-based methods are preferred to destructive techniques because they allow the measurement and analysis of individual fruit, reduce waste and permit repeated measures on the same item over time. A wide range of objective instruments for sensing and measuring the quality attributes of fresh produce have been reported. Among non-destructive quality assessment techniques, near-infrared (NIR) spectroscopy (NIRS) is arguably the most advanced with regard to instrumentation, applications, accessories and chemometric software packages. This paper reviews research progress on NIRS applications in internal and external quality measurement of citrus fruit, including the selection of NIR characteristics for spectra capture, analysis and interpretation. A brief overview on the fundamental theory, history, chemometrics of NIRS including spectral pre-processing methods, model calibration, validation and robustness is included. Finally, future prospects for NIRS-based imaging systems such as multispectral and hyperspectral imaging as well as optical coherence tomography as potential non-destructive techniques for citrus quality assessment are explored.