title: Evaluation of quality changes in walnut kernels (Juglans regia L.) by Vis/NIR spectroscopy.
abstract: Storage of walnut kernels in light and at room temperature, as is common practice, is detrimental to their sensory quality and shelf life. This study demonstrates that Vis/NIR spectroscopy, in combination with multivariate data analysis (chemometrics), is a most capable rapid method for monitoring the overall quality deterioration of walnut kernels. Spectral predictions of the sensory attributes nutty and rancid tastes by partial least-squares regression (PLSR) resulted in correlations (r(2)) of 0.77 and 0.86, respectively, whereas with PLSR prediction of the chemical parameter hexanal content a correlation (r(2)) of 0.72 was obtained. The study further establishes that storage in light results in pronounced oxidative changes, especially in walnuts stored at 21 degrees C, whereas dark storage at 5 degrees C results in walnuts without any trace of rancid taste during 25 weeks of storage at accelerated storage conditions (50% oxygen).
authors.affiliation: Department of Dairy and Food Science, The Royal Veterinary and Agricultural University, Rolighedsvej 30, DK 1958 Frederiksberg C, Denmark. pnj@kvl.dk
authors.forename: P N
authors.initials: PN
authors.lastname: Jensen
authors.forename: G
authors.initials: G
authors.lastname: Sørensen
authors.forename: S B
authors.initials: SB
authors.lastname: Engelsen
authors.forename: G
authors.initials: G
authors.lastname: Bertelsen
mesh_terms: D005511:Food Handling; D008055:Lipids / Q000302:isolation & purification; D009754:Nuts / Q000737:chemistry*; D010545:Peroxides / Q000032:analysis; D013053:Spectrophotometry / Q000379:methods; D013055:Spectrophotometry, Infrared / Q000379:methods
chemical_list: D008055:Lipids; D010545:Peroxides