stretching vibrations in CH2 groups, respectively [18].Againwe observed positive coefficients for non-defective and light sour coffees and negative for dark sour and black coffees. Non-defective and immature coffees also displayed positive coefficients at 3007 cm À 1, where symmetric CH stretching of cis-olefinic groups (¼ C–Hincis RHC¼CHR) absorb [1].IntheNIRspectra,regionscharacterizedby lipids absorption that exhibited non-zero coefficients were the following: 1411, 1680–1755 and 2132–2166 nm, assigned to the 1st overtone of O–H, 1st overtone of C–HstretchinginCH2 groups and a combination of ¼CH stretching and C¼C stretching, respectively