Detection of sunflower oils adulteration by ATR-FTIR spectra

Determination of thermally deteriorated oil re-used as adulterants in sunflower oil using Fourier transform infrared spectroscopy

“…This peak is due to the ester carbonyl functional group of the triglycerides (Guillén and Cabo, 2000), and it shows a signi cant increase in intensity as well as absorption band widening for TDOs. This is in agreement with our previous ndings (Bunaciu et al, 2022a). Table 1 displays the IR spectral data obtained for the band around 1746 cm − 1 used for the rst quanti cation method.…”

Diagnostic segregation of human breast tumours using Fourier-transform infrared spectroscopy coupled with multivariate analysis: Classifying cancer subtypes

“…The wavenumbers derived from the spectral dataset of fibroadenoma were the following, with an importance order: 1541 cm -1 (Amide II), 1493 cm -1 (amino acid; ν[COO − ]), 1171 cm -1 (νC-O of side chain group in proteins), 1716 cm -1 (C=O stretching vibrations of lipids), 1458 cm -1 (σasCH3 of protein and lipids), 1066 cm -1 (νsPO2 − of nucleic acids). Those derived from cancer in the LD1 space were similar to fibroadenoma , the top six wavenumbers are 1452 cm -1 (σasCH3 of protein and lipids), 1001 cm -1 (νsPO4= of RNA), 1655 cm -1 (Amide I), 1061 cm -1 (glycogen), 1238 cm -1 (νasPO2 − of nucleic acids) and 1541 cm -1 (Amide II) [35].…”

“…The wavenumbers in the loadings plots show that each molecule subtype has a strong change at 1068 cm -1 or 1066 cm -1 (nucleic acid) except for Luminal B. Luminal B showed the main changes at 1680-1380 cm -1 (Amide I and Amide II), while HER2-positive at Amide I, Amide II, nucleic acid and glycogen. Table 2 has listed the principal six biomarkers of each category [35]. Luminal A mainly showed RNA (1001 cm -1 ), Amino acid (1450 cm -1 ,1493 cm -1 ) and Amide II (1541 cm -1 ); Luminal B mainly showed Amide I (1653 cm -1 , 1614 cm -1 ), Amide II (1574 cm -1 ,1541 cm -1 ) and amino acid (1452 cm -1 , 1392 cm -1 ); HER2-positive mainly showed protein (1159 cm -1 ), Nucleic acid (983 cm -1 ), Amide I (1662 cm -1 ) and Amino acid (1479 cm -1 ); and TNBC predominantly showed C=O stretching of Lipid (1716 cm -1 ), Amide I (1683 cm -1 , 1647 cm -1 ) and nucleic acid (1066 cm -1 ).…”

Detection and characterization of adulterants in baru and soursop oils

“…Some oilseed species offer a low extraction yield and high-added value of their resulting oils; thus, the practice of adulteration of these oils becomes advantageous and pervasive as it results in higher profits through the commercialization of these products. In this context, various high-value oils (babassu, olive, canola and sunflower) are adulterated with other oils with low commercial value, but with physical-chemical characteristics similar, as soybean oil (SO) (Bunaciu et al, 2022;Chen et al, 2018b;Silveira et al, 2017;Pereira et al, 2022). Because this practice negatively affects the quality of the product and compromises the functional and bioactive properties of these oils, the authenticity and quality of these products need to be strictly monitored.…”