Estimating the content of free fatty acids in high‐oleic sunflower seeds by near‐infrared spectroscopy

Abstract

Estimating the content of free fatty acids in high-oleic sunflower seeds by near-infrared spectroscopyThe content of free fatty acids (FFA) in vegetable oils represents an important quality factor in oil crops. The objective of the investigation was to develop a near-infrared (NIR) calibration for estimating the FFA content in high-oleic sunflower seeds. A sample set of different varieties from the harvest of 2004 as well as of 2005 from two locations in Germany was used; additionally seeds from 2003 were stored under unsuitable conditions to obtain samples utilised for calibration with an extended FFA range. A direct titration method for FFA determination was developed and adjusted to the official AOCS method. The modified method is sufficiently reliable, much faster than the AOCS method and therefore suitable for use in the calibration of NIR spectrometers. The developed NIR spectroscopy (NIRS) calibration was calculated with a modified partial least square algorithm, standard normal variate and detrend scatter correction and the 2 nd derivative of the spectra of ground sunflower seeds. The standard error of prediction of the validated calibration was 0.20, and the multiple coefficient of determination (RSQ val ) reached 0.94. The obtained results demonstrated clearly the efficiency and how cost effective the NIRS method is for the estimation of FFA content in sunflower seeds.

Effects of refining process on sunflower oil minor components: a review

“…The presence of high levels of free fatty acids, or free acidity, is due to wet harvest conditions which promote the action of lipases generating these molecules, as well as moist grains during storage (Beratlief and Iliescu, 1997). In sunflower oil FFA varied from 1.19 to 1.35% (w/w) in regular sunflower oil (Kreps et al, 2014), from 0.76 to 1.13% in HOHPSO (Marmesat et al, 2008) and can reach up to 4% in HOSO (Moschner and Biskupek-Korell, 2006). FFA are neutralized during the refining process in order to reduce their undesirable effects as undesirable flavor.…”

Assessment of Mass Flows and Fuel Quality During Mechanical Dehydration of Silages Using Near Infrared Reflectance Spectroscopy

“…[32,45] as well as mineral compositions [38,33,16]. However, most studies concentrate on pure sample sets of wheat [25], maize silage [11,23], herbages, grass silages [30,2], legumes [19,9], rice [48] sunflower [26] or hemp [44]. Reliability of NIRS had been questioned when analysis was performed across different plant species and cultivars [14,39].…”

Quality Characteristics of High-Oleic Sunflower Oil Extracted from Some Hybrids Cultivated Under Egyptian Conditions

“…When considering the oxidative stability, the seven oil types differed significantly for mean peroxide value (Table 3).Free fatty acid content is an important oil quality parameter (Moschner and Biskupek-Korell, 2006). The free fatty acid values obtained were below the limit of 2% and indicated that the oil of all seven hybrids was having good oxidative quality.…”