When detection of dairy food fraud fails: An alternative approach through proton nuclear magnetic resonance spectroscopy
نویسندگان
چکیده
This paper investigated the limits of current approach for determination fatty acids profile milk fats from proton nuclear magnetic resonance data based on hypothesis that signal at 0.96 ppm, currently assigned in literature as a marker “short chain acids,” is generated only by butyric moiety (not all short-chain acids, which also include C6:0—caproic acid). The was tested and experimentally confirmed. Moreover, triplet ppm can be due to n-3 such linolenic acid (C18:3); therefore, previously reported methodology profiling dairy products—considered general literature—cannot used fraud-detection approaches because it allows mistaken acid, consequently leading misclassification adulterated samples nonadulterated. To support our opinion, we have applied composition 3 synthetic nondairy fat blends obtained compositions similar fats, allowing their genuine fats. However, reality, had very different compositions, confirmed gas chromatography. Consequently, highlighted weaknesses existing detection food adulteration. In return, new descriptors various integral ratios signals associated with CH2 versus were proposed detect adulterations.
منابع مشابه
Quantification of plasma lipoproteins by proton nuclear magnetic resonance spectroscopy.
A new analytical procedure for quantifying plasma lipoproteins by proton nuclear magnetic resonance (NMR) spectroscopy has been developed that potentially offers significant advantages over existing clinical methods used for assessing risk of coronary heart disease. Analysis of a single spectrum of a nonfasting plasma sample, acquired simply and rapidly at moderate magnetic field strength (250 ...
متن کاملHigh-resolution proton nuclear magnetic resonance spectroscopy of cytochrome.
In cytochrome c the axial positions of the heme iron are occupied by two amino acid residues, one of which is known from X-ray studies to be histidyl. Nuclear magnetic resonance spectroscopy provides strong evidence that the sixth ligand is a methionyl residue in both the ferric and ferrous oxidation states. It is further shown that in cyanoferricytochrome c cyanide ion replaces methionyl in th...
متن کاملBrain Proton Magnetic Resonance Spectroscopy
Magnetic resonance (MR) spectroscopy is an analytical method used in chemistry that enables the identification and quantification of metabolites in samples. It differs from conventionalMR imaging in that spectra provide physiologic and chemical information instead of anatomy. MR spectroscopy and MR imaging have their origin in nuclear magnetic resonance (NMR). NMR was first described in 1946 si...
متن کاملDetection of new amino acid markers of liver trauma by proton nuclear magnetic resonance spectroscopy.
OBJECTIVE We examined serum in patients of liver injury to explore the possible clinical application of abnormal micrometabolites as a marker of liver injury and severity in cases of traumatic liver damage. METHODS Serum were screened by proton nuclear magnetic resonance spectroscopy in 96 patients with varying degree of liver injury and compared with concentrations in healthy control volunte...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 2021
ISSN: ['0022-0302', '1525-3198', '1529-9066']
DOI: https://doi.org/10.3168/jds.2020-19883