51
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High-Resolution NMR Spectroscopy: An Alternative Fast Tool for Qualitative and Quantitative Analysis of Diacylglycerol (DAG) Oil. J AM OIL CHEM SOC 2011. [DOI: 10.1007/s11746-011-1848-2] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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52
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53
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Alonso-Salces RM, Moreno-Rojas JM, Holland MV, Reniero F, Guillou C, Héberger K. Virgin olive oil authentication by multivariate analyses of 1H NMR fingerprints and delta13C and delta2H data. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2010; 58:5586-5596. [PMID: 20373822 DOI: 10.1021/jf903989b] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
(1)H NMR fingerprints of virgin olive oils (VOOs) from the Mediterranean basin (three harvests) were analyzed by principal component analysis, linear discriminant analysis (LDA), and partial least-squares discriminant analysis (PLS-DA) to determine their geographical origin at the national, regional, or PDO level. Further delta(13)C and delta(2)H measurements were performed by isotope ratio mass spectrometry (IRMS). LDA and PLS-DA achieved consistent results for the characterization of PDO Riviera Ligure VOOs. PLS-DA afforded the best model: for the Liguria class, 92% of the oils were correctly classified in the modeling step, and 88% of the oils were properly predicted in the external validation; for the non-Liguria class, 90 and 86% of hits were obtained, respectively. A stable and robust PLS-DA model was obtained to authenticate VOOs from Sicily: the recognition abilities were 98% for Sicilian oils and 89% for non-Sicilian ones, and the prediction abilities were 93 and 86%, respectively. More than 85% of the oils of both categories were properly predicted in the external validation. Greek and non-Greek VOOs were properly classified by PLS-DA: >90% of the samples were correctly predicted in the cross-validation and external validation. Stable isotopes provided complementary geographical information to the (1)H NMR fingerprints of the VOOs.
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Affiliation(s)
- Rosa M Alonso-Salces
- European Commission-Joint Research Centre, Institute for Health and Consumer Protection, Ispra, Italy.
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54
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Multivariate analysis of NMR fingerprint of the unsaponifiable fraction of virgin olive oils for authentication purposes. Food Chem 2010. [DOI: 10.1016/j.foodchem.2008.09.061] [Citation(s) in RCA: 104] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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55
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High-power gradient diffusion NMR spectroscopy for the rapid assessment of extra-virgin olive oil adulteration. Food Chem 2010. [DOI: 10.1016/j.foodchem.2009.04.088] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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56
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Jafari M, Kadivar M, Keramat J. Detection of Adulteration in Iranian Olive Oils Using Instrumental (GC, NMR, DSC) Methods. J AM OIL CHEM SOC 2008. [DOI: 10.1007/s11746-008-1333-8] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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57
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Dayrit FM, Buenafe OEM, Chainani ET, de Vera IMS. Analysis of monoglycerides, diglycerides, sterols, and free fatty acids in coconut (Cocos nucifera L.) oil by 31P NMR spectroscopy. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2008; 56:5765-9. [PMID: 18576656 DOI: 10.1021/jf8005432] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Phosphorus-31 nuclear magnetic resonance spectroscopy ( (31)P NMR) was used to differentiate virgin coconut oil (VCO) from refined, bleached, deodorized coconut oil (RCO). Monoglycerides (MGs), diglycerides (DGs), sterols, and free fatty acids (FFAs) in VCO and RCO were converted into dioxaphospholane derivatives and analyzed by (31)P NMR. On the average, 1-MG was found to be higher in VCO (0.027%) than RCO (0.019%). 2-MG was not detected in any of the samples down to a detection limit of 0.014%. On the average, total DGs were lower in VCO (1.55%) than RCO (4.10%). When plotted in terms of the ratio [1,2-DG/total DGs] versus total DGs, VCO and RCO samples grouped separately. Total sterols were higher in VCO (0.096%) compared with RCO (0.032%), and the FFA content was 8 times higher in VCO than RCO (0.127% vs 0.015%). FFA determination by (31)P NMR and titration gave comparable results. Principal components analysis shows that the 1,2-DG, 1,3-DG, and FFAs are the most important parameters for differentiating VCO from RCO.
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Affiliation(s)
- Fabian M Dayrit
- Department of Chemistry, Ateneo de Manila University, Katipunan Avenue, Loyola Heights, Quezon City, Philippines 1108.
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58
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Authenticity control of pistachios based on 1H- and 13C-NMR spectroscopy and multivariate statistics. Eur Food Res Technol 2007. [DOI: 10.1007/s00217-007-0804-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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59
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Crutchfield CA, Harris DJ. Molecular mass estimation by PFG NMR spectroscopy. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2007; 185:179-82. [PMID: 17188920 DOI: 10.1016/j.jmr.2006.12.004] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2006] [Revised: 12/05/2006] [Accepted: 12/08/2006] [Indexed: 05/13/2023]
Abstract
A simplified PFG NMR diffusion analysis method was developed to estimate the molecular mass of small molecules in dilute aqueous and organic solutions. Internal referencing was utilized to improve the experimental robustness and simplify the data analysis. Specifically, tetramethylsilane (TMS) and HDO were chosen for the organic and aqueous reference molecules, respectively. Relative diffusivity-molecular mass correlations were empirically developed in the range of 2-1280 g/mol for dilute CDCl3 and D2O solutions. The median error in the predicted molecular mass was found to be 10 rel%. The utility of the method was demonstrated by analyzing the major and minor components in olive oil.
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60
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Naczk M, Shahidi F. Phenolics in cereals, fruits and vegetables: Occurrence, extraction and analysis. J Pharm Biomed Anal 2006; 41:1523-42. [PMID: 16753277 DOI: 10.1016/j.jpba.2006.04.002] [Citation(s) in RCA: 618] [Impact Index Per Article: 34.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2006] [Revised: 04/04/2006] [Accepted: 04/06/2006] [Indexed: 12/27/2022]
Abstract
Consumption of plant foods, particularly fruits, vegetables and cereal grains is encouraged because they render beneficial health effects. Phenolics and polyphenolics are among the most desirable food bioactives because of their antioxidant activity, brought about by a number of pathways, or due to other mechanisms. The analysis of phenolics and polyphenolics requires their extraction possible purification and structure elucidation. This overview provides a cursory account of the source, extraction and analysis of phenolics in fruits, vegetables and cereals.
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Affiliation(s)
- Marian Naczk
- Department of Human Nutrition, St. Francis Xavier University, Antigonish, NS, Canada B2G 2W5
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61
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Cossignani L, Luneia R, Damiani P, Simonetti MS, Riccieri R, Tiscornia E. Analysis of isomeric diacylglycerolic classes to evaluate the quality of olive oil in relation to storage conditions. Eur Food Res Technol 2006. [DOI: 10.1007/s00217-006-0327-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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62
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SALERNO ANNA, PIERANDREI FERNANDO, REA ELVIRA, SEQUI PAOLO, VALENTINI MASSIMILIANO. DEFINITION OF INTERNAL MORPHOLOGY AND STRUCTURAL CHANGES DUE TO DEHYDRATION OF RADISH (RAPHANUS SATIVUS L. CV. SUPRELLA) USING MAGNETIC RESONANCE IMAGING SPECTROSCOPY. J FOOD QUALITY 2005. [DOI: 10.1111/j.1745-4557.2005.00046.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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63
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Correlation between 1
H NMR and traditional methods for determining lipid oxidation of ethyl docosahexaenoate. J AM OIL CHEM SOC 2004. [DOI: 10.1007/s11746-004-1025-1] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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64
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Antonietta Brescia M, Mazzilli V, Sgaramella A, Ghelli S, Paolo Fanizzi F, Sacco A. 1H NMR characterization of milk lipids: A comparison between cow and buffalo milk. J AM OIL CHEM SOC 2004. [DOI: 10.1007/s11746-004-0918-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
| | - Vincenzo Mazzilli
- Dipartimento di Chimica; Campus Universitario; Via Orabona 4 70126 Bari Italy
| | - Angela Sgaramella
- ; Dipartimento di Scienze delle Produzioni, dell'Ingegneria, della Meccanica e dell'Economia Applicate ai Sistemi Agro-Alimentari; Università degli Studi di Foggia, Facoltà di Agraria; 71100 Foggia Italy
| | | | - Francesco Paolo Fanizzi
- ; Dipartimento di Scienze e Technologie Biologiche ed Ambientali; Università di Lecce; 73100 Lecce
- Consortium C.A.R.S.O. Cancer Research Center; 70010 Valenzano, Bari Italy
| | - Antonio Sacco
- Dipartimento di Chimica; Campus Universitario; Via Orabona 4 70126 Bari Italy
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65
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Shintu L, Ziarelli F, Caldarelli S. Is high-resolution magic angle spinning NMR a practical speciation tool for cheese samples? Parmigiano Reggiano as a case study. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2004; 42:396-401. [PMID: 15022201 DOI: 10.1002/mrc.1359] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
High-resolution magic angle spinning (HRMAS) NMR is probably the most apt NMR method to analyze complex materials involving a solid phase, e.g. foodstuffs. We present here an HRMAS analysis of grated cheese (Parmigiano Reggiano). A full NMR characterization of this cheese allows the identification of the presence of fatty acids (saturated and unsaturated), amino acids and other small organic molecules. Since the presence and relative concentration of these molecules have previously been shown to correlate with organoleptic, origin and age characterization, HRMAS NMR of cheese is likely to provide a good complimentary tool for the analysis of this food material.
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Affiliation(s)
- Laetitia Shintu
- UMR 6516 Synthèse, Chiralité et Catalyse, Université d'Aix-Marseille III, 13397 Marseille Cedex 20, France
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66
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Tavares MIB, Bathista ALBS, Silva EO, Costa PM, Filho NP, Nogueira JS. 13C-NMR study ofDipteryx Alata Vogel starch. J Appl Polym Sci 2004. [DOI: 10.1002/app.20191] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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67
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Vigli G, Philippidis A, Spyros A, Dais P. Classification of edible oils by employing 31P and 1H NMR spectroscopy in combination with multivariate statistical analysis. A proposal for the detection of seed oil adulteration in virgin olive oils. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2003; 51:5715-5722. [PMID: 12952424 DOI: 10.1021/jf030100z] [Citation(s) in RCA: 109] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A combination of (1)H NMR and (31)P NMR spectroscopy and multivariate statistical analysis was used to classify 192 samples from 13 types of vegetable oils, namely, hazelnut, sunflower, corn, soybean, sesame, walnut, rapeseed, almond, palm, groundnut, safflower, coconut, and virgin olive oils from various regions of Greece. 1,2-Diglycerides, 1,3-diglycerides, the ratio of 1,2-diglycerides to total diglycerides, acidity, iodine value, and fatty acid composition determined upon analysis of the respective (1)H NMR and (31)P NMR spectra were selected as variables to establish a classification/prediction model by employing discriminant analysis. This model, obtained from the training set of 128 samples, resulted in a significant discrimination among the different classes of oils, whereas 100% of correct validated assignments for 64 samples were obtained. Different artificial mixtures of olive-hazelnut, olive-corn, olive-sunflower, and olive-soybean oils were prepared and analyzed by (1)H NMR and (31)P NMR spectroscopy. Subsequent discriminant analysis of the data allowed detection of adulteration as low as 5% w/w, provided that fresh virgin olive oil samples were used, as reflected by their high 1,2-diglycerides to total diglycerides ratio (D > or = 0.90).
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Affiliation(s)
- Georgia Vigli
- NMR Laboratory, Department of Chemistry, University of Crete, 714 09 Iraklion, Crete, Greece
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68
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Guillén MD, Ruiz A, Cabo N, Chirinos R, Pascual G. Characterization of sacha inchi (Plukenetia volubilis
L.) oil by FTIR spectroscopy and 1
H NMR. Comparison with linseed oil. J AM OIL CHEM SOC 2003. [DOI: 10.1007/s11746-003-0768-z] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- María D. Guillén
- ; Tecnología de Alimentos, Facultad de Farmacia; Universidad del País Vasco; Paseo de la Universidad 7 01006 Vitoria Spain
| | - Ainhoa Ruiz
- ; Tecnología de Alimentos, Facultad de Farmacia; Universidad del País Vasco; Paseo de la Universidad 7 01006 Vitoria Spain
| | - Nerea Cabo
- ; Tecnología de Alimentos, Facultad de Farmacia; Universidad del País Vasco; Paseo de la Universidad 7 01006 Vitoria Spain
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69
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Gil A, Duarte I, Godejohann M, Braumann U, Maraschin M, Spraul M. Characterization of the aromatic composition of some liquid foods by nuclear magnetic resonance spectrometry and liquid chromatography with nuclear magnetic resonance and mass spectrometric detection. Anal Chim Acta 2003. [DOI: 10.1016/s0003-2670(03)00579-8] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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70
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Ogrinc N, Kosir IJ, Spangenberg JE, Kidric J. The application of NMR and MS methods for detection of adulteration of wine, fruit juices, and olive oil. A review. Anal Bioanal Chem 2003; 376:424-30. [PMID: 12819845 DOI: 10.1007/s00216-003-1804-6] [Citation(s) in RCA: 147] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2002] [Accepted: 01/15/2003] [Indexed: 11/27/2022]
Abstract
This review covers two important techniques, high resolution nuclear magnetic resonance (NMR) spectroscopy and mass spectrometry (MS), used to characterize food products and detect possible adulteration of wine, fruit juices, and olive oil, all important products of the Mediterranean Basin. Emphasis is placed on the complementary use of SNIF-NMR (site-specific natural isotopic fractionation nuclear magnetic resonance) and IRMS (isotope-ratio mass spectrometry) in association with chemometric methods for detecting the adulteration.
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Affiliation(s)
- N Ogrinc
- J. Stefan Institute, Department of Environmental Sciences, Jamova 39, 1000, Ljubljana, Slovenia
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71
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Spyros A. Characterization of unsaturated polyester and alkyd resins using one- and two-dimensional NMR spectroscopy. J Appl Polym Sci 2003. [DOI: 10.1002/app.11950] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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72
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Romero MP, Tovar MJ, Girona J, Motilva MJ. Changes in the HPLC phenolic profile of virgin olive oil from young trees (Olea europaea L. Cv. Arbequina) grown under different deficit irrigation strategies. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2002; 50:5349-5354. [PMID: 12207473 DOI: 10.1021/jf020357h] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The HPLC phenolic profile of virgin olive oils obtained from young olive trees (Arbequina cv.) grown under different deficit irrigation strategies was studied. Deficit irrigation (RDI) did not affect all the phenolic compounds in the same way. Lignans, vanillic acid, vanillin, and the unknown phenolic compound named P24 increased in the oils from the most irrigated treatments. The secoiridoid derivatives and the unknown phenolic compound named P19 increased in the oils from the most stressed irrigation treatments. The period of growth where a water stress significantly affects the phenolic profile of oils was between pit hardening and the first stages of fruit growth and oil accumulation, independently of the water applied during the previous period to harvest. The phenolic profile and those parameters related to phenol content, oxidative stability, and the bitter index were significantly affected only in the most severe RDI strategies. Other strategies produced important savings in irrigation requirements and an increase in the water use efficiency without noticeably affecting the phenolic profile.
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Affiliation(s)
- M Paz Romero
- Food Technology Department, CeRTA-UTPV, Escuela Técnica Superior de Ingeniería Agraria, Universidad de Lleida, Av/Alcalde Rovira Roure 191, 25198 Lleida, Spain
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73
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Cerrato Oliveros MC, Pérez Pavón JL, Garcı́a Pinto C, Fernández Laespada ME, Moreno Cordero B, Forina M. Electronic nose based on metal oxide semiconductor sensors as a fast alternative for the detection of adulteration of virgin olive oils. Anal Chim Acta 2002. [DOI: 10.1016/s0003-2670(02)00119-8] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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74
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Fronimaki P, Spyros A, Christophoridou S, Dais P. Determination of the diglyceride content in greek virgin olive oils and some commercial olive oils by employing (31)P NMR spectroscopy. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2002; 50:2207-2213. [PMID: 11929272 DOI: 10.1021/jf011380q] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
In this study, the diglyceride contents of 96 samples of virgin olive oils from the regions of Crete, Lesvos, Messinia, Pilion, Zakynthos, Halkidiki, and Ilia, 15 samples of commercial extra virgin and pure olive oils, and 3 samples each of refined olive oils and pomace oils were determined by a facile method introduced in a previous publication. This method is based on the phosphitylation of the free hydroxyls of the diglycerides with 2-chloro-4,4,5,5-tetramethyldioxaphospholane and the integration of the appropriate peaks in the (31)P NMR spectra. This preliminary study showed interesting trends in the diglyceride content of the virgin olive oils from the various regions of Greece that can be used as simple criteria to assess the olive oil characteristics. Analysis of variance has been carried out for the diglyceride content of each region in an attempt to detect possible differences in the diglyceride levels among the various regions. Finally, the relationship between the ratio of 1,2-diglycerides to the total amount of diglycerides and the total amount of diglycerides has been used to monitor the quality of virgin olive oils, commercial olive oils, refined olive oils, and pomace oils.
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Affiliation(s)
- Penelope Fronimaki
- NMR Laboratory, Department of Chemistry, University of Crete, 714 09 Iraklion, Crete, Greece
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75
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76
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Classification of vegetable oils by high-resolution 13
C NMR spectroscopy using chromatographically obtained oil fractions. J AM OIL CHEM SOC 2002. [DOI: 10.1007/s11746-002-0472-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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77
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Oil fractionation as a preliminary step in the characterization of vegetable oils by high-resolution 13
C NMR spectroscopy. J AM OIL CHEM SOC 2002. [DOI: 10.1007/s11746-002-0471-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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78
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Guillén MD, Ruiz A. High resolution 1H nuclear magnetic resonance in the study of edible oils and fats. Trends Food Sci Technol 2001. [DOI: 10.1016/s0924-2244(01)00101-7] [Citation(s) in RCA: 138] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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79
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Analytical characteristics of virgin olive oil from young trees (arbequina cultivar) growing under linear irrigation strategies. J AM OIL CHEM SOC 2001. [DOI: 10.1007/s11746-001-0353-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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80
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Use of high-resolution 13
C nuclear magnetic resonance spectroscopy for the screening of virgin olive oils. J AM OIL CHEM SOC 2001. [DOI: 10.1007/s11746-001-0225-z] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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81
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Mannina L, Luchinat C, Emanuele MC, Segre A. Acyl positional distribution of glycerol tri-esters in vegetable oils: a 13C NMR study. Chem Phys Lipids 1999. [DOI: 10.1016/s0009-3084(99)00092-4] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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82
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Scano P, Casu M, Lai A, Saba G, Dessi MA, Deiana M, Corongiu FP, Bandino G. Recognition and quantitation of cis-vaccenic and eicosenoic fatty acids in olive oils by 13C nuclear magnetic resonance spectroscopy. Lipids 1999; 34:757-9. [PMID: 10478934 DOI: 10.1007/s11745-999-0422-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The presence of 11-cis monoenoic fatty acids was detected in olive oil samples by means of 13C nuclear magnetic resonance spectroscopy, and the positional isomery on the glycerol backbone was derived. The 11-cis vaccenic and eicosenoic fatty acid resonances were recognized and the amounts of the fatty acids quantified. For comparison purposes, a quantitative analysis was also made by gas chromatography.
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Affiliation(s)
- P Scano
- Dipartimento di Scienze Chimiche, Universita di Cagliari, Complesso Universitario di Monserrato, Cagliari, Italy
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83
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