Real time continuous oxygen concentration monitoring system during malaxation for the production of Virgin Olive Oil

During the mechanical extraction process of Virgin Olive Oil (VOO) some important physical phenomena and enzymatic transformations occur which influence the quality of the final product. The control of process parameters is crucial to ensure the quality of VOO, therefore process monitoring and control is a fundamental requirement in the modern VOO processing industry. The present work proposes an innovative Real-Time Monitoring System (RTMS) aimed at continuously measuring the oxygen concentration during the malaxation process in order to establish a correlation with the quality of the final product obtained. This monitoring system is based on an oxygen concentration sensor directly connected to the malaxation chamber and a data acquisition system to analyze and store the measured values in a process database. The experimental results obtained show that the use of oxygen during malaxation improves some qualitative parameters of VOO such as free fatty acids and total polyphenols while others (peroxide values and spectrophotometric indexes) worsen. These results are similar to those obtained by employing nitrogen, which is the traditional technique to avoid the wellknown oxidation processes studied by several researchers, thus demonstrating that the presence of oxygen during the malaxation process can have beneficial effects on the quality of VOO when its concentration is properly controlled.

[1]  Marzia Migliorini,et al.  Influence of O2 on the quality of virgin olive oil during malaxation , 2006 .

[2]  D. Caruso,et al.  Biological activities and metabolic fate of olive oil phenols , 2002 .

[3]  Pasquale Catalano,et al.  Productive Efficiency of Decanters with Short and Variable Dynamic Pressure Cones , 2003 .

[4]  Daria Di Vincenzo,et al.  Influence of olive processing on virgin olive oil quality , 2002 .

[5]  F. Luchetti.  Importance and future of olive oil in the world market: an introduction to olive oil , 2002 .

[6]  Paolo Spugnoli,et al.  Malaxation of Olive Paste Under Sealed Conditions , 2011 .

[7]  Rolf Isermann,et al.  Fault diagnosis of machines via parameter estimation and knowledge processing - Tutorial paper , 1991, Autom..

[8]  K. Tunlasakun,et al.  A microcontroller based islanding detection for grid connected inverter , 2004, The 2004 47th Midwest Symposium on Circuits and Systems, 2004. MWSCAS '04..

[9]  K. Karakostas,et al.  Proposed parameters for monitoring quality of virgin olive oil (Koroneiki cv) , 2003 .

[10]  D. L. García-González,et al.  Virgin olive oil - Chemical implications on quality and health , 2008 .

[11]  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.

[12]  Hisashi Osumi,et al.  Object location based on sensor fusion of visual and tactual sensing , 1998, Adv. Robotics.

[13]  A. M. Inarejos-García,et al.  Influence of malaxation conditions on virgin olive oil yield, overall quality and composition , 2009 .

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

[15]  N. Costantini,et al.  Influence of malaxation time of olive paste on oil extraction yields and chemical and organoleptic characteristics of virgin olive oil obtained by a centrifugal decanter at water saving , 2002 .

[16]  M. Bucciantini,et al.  Oleuropein aglycon prevents cytotoxic amyloid aggregation of human amylin. , 2010, The Journal of nutritional biochemistry.

[17]  Maurizio Servili,et al.  Volatile compounds and phenolic composition of virgin olive oil: optimization of temperature and time of exposure of olive pastes to air contact during the mechanical extraction process. , 2003, Journal of agricultural and food chemistry.

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

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

[20]  M. Tsimidou,et al.  On the importance of total polar phenols to monitor the stability of Greek virgin olive oil , 2002 .

[21]  A. Ranalli,et al.  Malaxing temperature affects volatile and phenol composition as well as other analytical features of virgin olive oil , 2001 .

[22]  J.J. Gertler,et al.  Survey of model-based failure detection and isolation in complex plants , 1988, IEEE Control Systems Magazine.

[23]  Paul M. Frank,et al.  Fault diagnosis in dynamic systems using analytical and knowledge-based redundancy: A survey and some new results , 1990, Autom..

[24]  A. Ranalli,et al.  Effect of olive paste kneading process time on the overall quality of virgin olive oil , 2003 .

[25]  A. Ranalli,et al.  Analytical evaluation of virgin olive oil of first and second extraction. , 1999, Journal of agricultural and food chemistry.

[26]  L. Calamai,et al.  Influence of the extraction process on dissolved oxygen in olive oil , 2007 .

[27]  E. Chabot,et al.  Microcontroller based artificial synapse , 2005, Proceedings of the IEEE 31st Annual Northeast Bioengineering Conference, 2005..

[28]  M. Chiariello,et al.  Oleuropein prevents oxidative myocardial injury induced by ischemia and reperfusion. , 2004, The Journal of nutritional biochemistry.

[29]  Rolf Isermann.  FAULT DIAGNOSIS OF MACHINES VIA PARAMETER ESTIMATION AND KNOWLEDGE PROCESSING , 1992 .

[30]  R. Amirante,et al.  Influence of mixing and extraction parameters on virgin olive oil quality , 2001 .

[31]  M. Servili,et al.  The phenolic and volatile compounds of virgin olive oil: relationships with the endogenous oxidoreductases during the mechanical oil extraction process. , 2000 .