scholarly journals A Novel Photometric Method for Evaluation of the Oxidative Stability of Virgin Olive Oils

2008 ◽  
Vol 91 (4) ◽  
pp. 794-801 ◽  
Author(s):  
Vassilis N Kamvissis ◽  
Emmanouil G Barbounis ◽  
Nikolaos C Megoulas ◽  
Michael A Koupparis
Keyword(s):  
Fatty Acids ◽  
Free Fatty Acids ◽  
Antioxidant Capacity ◽  
Correlation Coefficient ◽  
Photometric Method ◽  
Oil Stability Index ◽  
Virgin Olive Oils ◽  
Olive Oils ◽  
Rancimat Method ◽  
Wide Range

Abstract The Oxitester method, a novel, simple, and fast photometric method for the evaluation of the antioxidant capacity of olive oils, was validated and compared to the official oil stability index (Rancimat) method. The Oxitester method appeared to be a good alternative to the Rancimat method with adequate correlation for a wide range of virgin olive oil samples, including extrissima virgin olive oils (correlation coefficient 0.88), and extra virgin olive oils of increased acidity (free fatty acids >0.45, correlation coefficient 0.89). Other quality factors (flavor, free fatty acids content, specific absorbance at 270 and 232 nm, peroxide value, and content of oleic, linoleic, and linolenic acids) were also measured and correlated to the antioxidant capacity values of the Oxitester and Rancimat methods. The Oxitester method, in contrast to the Rancimat method, was indicative of the flavor characteristics of the olive oils and the content of linolenic acid.

scholarly journals Deterioration of Extra Virgin Olive Oil Caused by Different Processes

2017 ◽  
Vol 6 (5) ◽  
pp. 59 ◽  
Author(s):  
Nadia Segura ◽  
Yenny Pinchak ◽  
Natalie Merlinski ◽  
Miguel Amarillo ◽  
Camila Feller ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Oxidative Stability ◽  
Antioxidant Capacity ◽  
Olive Oil ◽  
Virgin Olive Oil ◽  
Natural Antioxidants ◽  
Extra Virgin Olive Oil ◽  
Total Phenols ◽  
Olive Oils ◽  
Useful Life

Extra virgin olive oil is recognized as a very stable oil because of its composition in fatty acids and its content in natural antioxidants (tocopherols and polyphenols). In the bibliography are works that address different aspects of this stability, from the duration of its useful life to its performance in the frying of foods. Some works also link their stability with the content of natural antioxidants. For example, Franco et al. (2014) studied the content of phenols and their antioxidant capacity in olive oils of seven different varieties. Baccouri et al. (2008) found a good correlation between the oxidative stability (measured in Rancimat) of the oils studied and the concentration of total phenols and tocopherols.

Antioxidant capacity of extra-virgin olive oils

2001 ◽  
Vol 78 (3) ◽  
pp. 243-247 ◽  
Author(s):  
Paolino Ninfali ◽  
Gianfranca Aluigi ◽  
Mara Bacchiocca ◽  
Mauro Magnani
Keyword(s):  
Antioxidant Capacity ◽  
Virgin Olive Oils ◽  
Olive Oils

Pigment Profile, Color and Antioxidant Capacity of Arbequina Virgin Olive Oils from Different Irrigation Treatments

2017 ◽  
Vol 94 (7) ◽  
pp. 935-945 ◽  
Author(s):  
Estela Sena-Moreno ◽  
Juan Manuel Pérez-Rodríguez ◽  
Concepción De Miguel ◽  
María Henar Prieto ◽  
María Nieves Franco ◽  
...  
Keyword(s):  
Antioxidant Capacity ◽  
Virgin Olive Oils ◽  
Olive Oils ◽  
Pigment Profile ◽  
Irrigation Treatments

Larval settlement of Sabellaria cementarium Moore, and comparisons with other species of sabellariid polychaetes

1991 ◽  
Vol 69 (3) ◽  
pp. 765-770 ◽  
Author(s):  
Joseph R. Pawlik ◽  
Fu-Shiang Chia
Keyword(s):  
Fatty Acids ◽  
Free Fatty Acids ◽  
Organic Solvents ◽  
Larval Settlement ◽  
Chemical Cue ◽  
Naturally Occurring ◽  
Wide Range ◽  
Settlement Strategies ◽  
Polychaete Family ◽  
Marine Worms

Tube-building marine worms of the polychaete family Sabellariidae exhibit a wide range of settlement strategies; the larvae of some species settle with near-absolute specificity on the sandy tubes of conspecific adults to build extensive reefs, while others are not gregarious and construct solitary or paired tubes. Sabellaria cementarium forms aggregations in some localities, but it is nongregarious throughout much of its range. Larvae of S. cementarium were competent to metamorphose in 25 days at 15 °C, much sooner than previously reported and within the range of other sabellariids cultured under the same conditions. In two of three experiments, there were no significant differences in larval settlement on conspecific tube sand versus control sand or tube sand extracted with organic solvents, suggesting that this species does not aggregate in response to a chemical cue. Settlement was not enhanced in response to free fatty acids, naturally occurring inducers of settlement for two reef-forming sabellariids, Phragmatopoma lapidosa lapidosa and P. l. californica. In reciprocal assays, larvae of S. cementarium and P. l. californica did not significantly discriminate between conspecific and heterospecific tube sand; yet, where they co-occur, the tubes of the former species are not found in aggregations of the latter. The two species were not interfertile, although one cross resulted in ~ 14% fertilization with larvae dying shortly after hatching. The processes by which larvae of S. cementarium avoid settlement on the tubes of P. l. californica (and the reverse for the latter species) remain unclear.

Influence of genotype on the fatty acids composition of virgin olive oils from advanced selections obtained by crosses between Arbequina, Picual, and Frantoio cultivars along the ripening process

2015 ◽  
Vol 117 (8) ◽  
pp. 1261-1270 ◽  
Author(s):  
Verónica Sánchez de Medina ◽  
Mónica Calderón-Santiago ◽  
Milad El Riachy ◽  
Feliciano Priego-Capote ◽  
María Dolores Luque de Castro
Keyword(s):  
Fatty Acids ◽  
Fatty Acids Composition ◽  
Virgin Olive Oils ◽  
Ripening Process ◽  
Olive Oils

scholarly journals Characterization of european virgin olive oils using fatty acids

1993 ◽  
Vol 44 (1) ◽  
pp. 18-24 ◽  
Author(s):  
María V. Alonso García ◽  
R. Aparicio López
Keyword(s):  
Fatty Acids ◽  
Virgin Olive Oils ◽  
Olive Oils
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