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- Title
FT-MIR Analysis of Water-Soluble Extracts during the Ripening of Sheep Milk Cheese with Different Phospholipid Content.
- Authors
Sakkas, Lambros; Pappas, Christos S.; Moatsou, Golfo
- Abstract
The purpose of this work was to study the suitability of the water-soluble extracts (WSE) of semi-hard sheep milk cheese for analysis by diffuse reflectance Fourier transform mid-infrared spectroscopy (FT-MIR) and the development of classification models using discriminant analysis and based on cheese age or phospholipid content. WSE was extracted from three types of sheep milk cheeses (full-fat, reduced-fat and reduced-fat fortified with lyophilized sweet sheep buttermilk) at various stages of ripening from six to 168 days and lyophilized. The first model used 1854-1381 and 1192-760 cm-1 regions of the first-derivative spectra and successfully differentiated samples of different age, based on changes in the water-soluble products of ripening biochemical events. The second model used the phospholipid absorbance spectral regions (3012-2851, 1854-1611 and 1192-909 cm-1) to successfully discriminate cheeses of markedly different phospholipid content. Cheese WSE was found suitable for FT-MIR analysis. According to the results, a fast and simple method to monitor cheese ripening based on water-soluble substances has been developed. Additionally, the results indicated that a considerable amount of phospholipids migrates to the cheese WSE and that FT-MIR can be a useful tool for their assessment.
- Subjects
PHOSPHOLIPID analysis; SHEEP milk; FOURIER transform infrared spectroscopy; CHEESE ripening; FREEZE-drying; DISCRIMINANT analysis
- Publication
Dairy, 2021, Vol 2, Issue 4, p530
- ISSN
2624-862X
- Publication type
Article
- DOI
10.3390/dairy2040042