Effect of oxygen reduction during malaxation on the quality of extra virgin olive oil (Cv. Carboncella) extracted through “two-phase” and “three-phase” centrifugal decanters

Abstract Quality and composition of virgin olive oil (VOO) are strictly dependent on complex processes that take place during the olive fruit crushing and malaxation of the olive paste. In this work, modulation of O2 levels within malaxation chambers (R1: unmodified atmosphere; R2: oxygen: 12.73–4.64 kPa from the beginning to the end of malaxation; R3: 10.46–2.27 kPa; R4: 9.87–0.69 kPa) in two continuous “two-phase” and “three-phase” oil extraction plants was performed. Combined effects on the biosynthesis of nutritionally bioactive molecules and aroma volatiles and on the resulting sensory properties of the produced oils were investigated. Results showed that the type of oil extraction plant markedly affected the level of the phenolic compounds in the oil (and the related sensory attributes of bitter, pungency, astringency and bitter and pungency persistence). Reduction of O2 concentration in the malaxing chamber, while having a minor impact on the presence of phenolic compounds, significantly affected the formation of all the examined volatiles. Particularly, lowered levels of oxygen hindered the formation of lipoxygenase derived volatiles weakening odours and flavours of artichoke, fresh fruity, and fresh cut grass.

[1]  R. Keast,et al.  Phytochemistry: Ibuprofen-like activity in extra-virgin olive oil , 2005, Nature.

[2]  R. Keast,et al.  Chemistry and Health of Olive Oil Phenolics , 2008, Critical reviews in food science and nutrition.

[3]  G. Tümen,et al.  Phenolics profiles of olive fruits (Olea europaea L.) and oils from Ayvalık, Domat and Gemlik varieties at different ripening stages. , 2013, Food chemistry.

[4]  T. Cecchi,et al.  Volatile profiles of Italian monovarietal extra virgin olive oils via HS-SPME-GC-MS: newly identified compounds, flavors molecular markers, and terpenic profile. , 2013, Food chemistry.

[5]  Werner Grosch,et al.  Odorants of Virgin Olive Oils with Different Flavor Profiles , 1998 .

[6]  G. Fregapane,et al.  Changes in phenolic composition and antioxidant activity of virgin olive oil during frying. , 2003, Journal of agricultural and food chemistry.

[7]  Joaquín Velasco,et al.  Oxidative stability of virgin olive oil , 2002 .

[8]  P. Khanal,et al.  p-HPEA-EDA, a phenolic compound of virgin olive oil, activates AMP-activated protein kinase to inhibit carcinogenesis. , 2011, Carcinogenesis.

[9]  J. A. Menéndez,et al.  Olive oil and health: summary of the II international conference on olive oil and health consensus report, Jaén and Córdoba (Spain) 2008. , 2010, Nutrition, metabolism, and cardiovascular diseases : NMCD.

[10]  Rosanna Abbate,et al.  Adherence to Mediterranean diet and health status: meta-analysis , 2008, BMJ : British Medical Journal.

[11]  F. Angerosa,et al.  Influence of malaxation temperature and time on the quality of virgin olive oils , 2001 .

[12]  G. Morozzi,et al.  Health and sensory properties of virgin olive oil hydrophilic phenols: agronomic and technological aspects of production that affect their occurrence in the oil. , 2004, Journal of chromatography. A.

[13]  Maurizio Servili,et al.  Contribution of phenolic compounds to virgin olive oil quality , 2002 .

[14]  A. Fernie,et al.  Catabolism of branched chain amino acids supports respiration but not volatile synthesis in tomato fruits. , 2012, Molecular plant.

[15]  M. Servili,et al.  Irrigation effects on quality, phenolic composition, and selected volatiles of virgin olive oils cv. Leccino. , 2007, Journal of agricultural and food chemistry.

[16]  C. Sanz,et al.  Oxygen concentration affects volatile compound biosynthesis during virgin olive oil production. , 2008, Journal of agricultural and food chemistry.

[17]  A. M. Inarejos-García,et al.  Effect of malaxation conditions on phenol and volatile profiles in olive paste and the corresponding virgin olive oils (Olea europaea L. Cv. Cornicabra). , 2009, Journal of agricultural and food chemistry.

[18]  A. Romani,et al.  Evaluation of lignans and free and linked hydroxy-tyrosol and tyrosol in extra virgin olive oil after hydrolysis processes , 2006 .

[19]  Maurizio Servili,et al.  Influence of the decrease in oxygen during malaxation of olive paste on the composition of volatiles and phenolic compounds in virgin olive oil. , 2008, Journal of agricultural and food chemistry.

[20]  Gianfranco Panfili,et al.  Natural antioxidants in the unsaponifiable fraction of virgin olive oils from different cultivars , 1998 .

[21]  H. Macfie,et al.  DESIGNS TO BALANCE THE EFFECT OF ORDER OF PRESENTATION AND FIRST-ORDER CARRY-OVER EFFECTS IN HALL TESTS , 1989 .

[22]  Harry T. Lawless,et al.  Sensory Evaluation of Food: Principles and Practices , 1998 .

[23]  Ramón Aparicio,et al.  Characterisation of monovarietal virgin olive oils , 2002 .

[24]  Maurizio Servili,et al.  Volatile compounds in virgin olive oil: occurrence and their relationship with the quality. , 2004, Journal of chromatography. A.

[25]  V. Marsilio,et al.  Biogenesis of «fusty» defect in virgin olive oils , 1996 .

[26]  S. Buxaderas,et al.  Analysis of virgin olive oil volatile compounds by headspace solid-phase microextraction coupled to gas chromatography with mass spectrometric and flame ionization detection. , 2003, Journal of chromatography. A.

[27]  Danny Bedgood,et al.  Olive oil volatile compounds, flavour development and quality: A critical review , 2007 .

[28]  M. Servili,et al.  Antioxidant activity of tocopherols and phenolic compounds of virgin olive oil , 1996 .

[29]  F. Paiva‐Martins,et al.  Oxidative stability of olive oil and its polyphenolic compounds after boiling vegetable process , 2010 .

[30]  Rafael de la Torre,et al.  Minor Components of Olive Oil: Evidence to Date of Health Benefits in Humans , 2006 .

[31]  Maurizio Servili,et al.  Air exposure time of olive pastes during the extraction process and phenolic and volatile composition of virgin olive oil , 2003 .