Comparative study of coadjuvants for extraction of olive oil
Three complete 23 factorial designs were developed in order to evaluate the effect of three physical acting coadjuvants on the extraction of virgin olive oil: talc, calcium carbonate and silica. Ranges of operating conditions were 0–2 % (w/w) for dosage of the coadjuvant, 20–60 °C for temperature and 20–60 min for time. Mathematical models and statistical analysis (ANOVA) were performed to evaluate the effects of these coadjuvants on oil yield, quality of virgin olive oil (acidity, peroxide index and UV absorption at 270 and 232 nm), natural pigments (chlorophylls and carotenoids) and natural antioxidants. In all cases, the oils obtained with coadjuvants were the same quality of those from non-treated olive paste. Therefore, all of them are producing a physical action. While improved oil extraction yields were achieved by using talc and calcium carbonate (1.1 and 1.0 kg oil per 100 kg olives), the use of silica resulted in an oil yield reduction (1.3 kg/100 kg olives). Concerning natural pigments and antioxidants, none of the studied coadjuvants modified the pigment content while that of the antioxidants increased slightly. All oils obtained with coadjuvants showed higher contents of polyphenols and tocopherols, which indicates increasing quality and nutraceutical level.
KeywordsVirgin olive oil Coadjuvant Talc Calcium carbonate Silica
Compliance with ethical standards
Conflict of interest
The authors declare no conflict of interest.
Compliance with ethics requirements
This article does not contain any studies with human or animal subjects.
- 2.European Union Commission EEC Regulation 1513 (2001) Amending Regulations EEC 136/66 and EC 638/98 as regards the extension of the period of validity of the aid scheme and the quality strategy for olive oil. Off J Eur Communities L201:4–7Google Scholar
- 6.Ranalli A, Pollastri L, Contento S, Lucera L, Del Re P (2003) Enhancing the quality in virgin olive oil by use of a new vegetable enzyme extract during processing. Eur Food Res Technol 216:109–115Google Scholar
- 8.Ben Brahim S, Marrakchi F, Gargouri B, Bouaziz M (2015) Optimization of malaxing conditions using CaCO3 as a coadjuvant: a method to increase yield and quality of extra virgin olive oil cv. Chemlali. LWT—Food Sci Technol 63:243–252Google Scholar
- 11.Fernández DG, Espínola F, Moya M (2008) The influence of different technological coadjuvants on the quality and yield of virgin olive oil using response surfaces methodology. Grasas Aceites 59:39–44Google Scholar
- 16.Swiderska-Bróz M (1991) On the manifold role of lime coagulation. Water Sci Technol 24:247–253Google Scholar
- 17.European Union Commission (2001) Directive 2001/30/CE of the Commission of 2 May 2001 which modifies directive 96/77/CE which establishes the requirements for specific purity for additives other than colorings and sweeteners. Off J Eur Communities L1468Google Scholar
- 18.Montgomery DC (2002) Diseño y Análisis de Experimentos. Limusa Wiley, MexicoGoogle Scholar
- 19.European Union Commission (1991) Regulation EEC 2568/91. Characteristics of olive and olive-pomace oils and on their analytical methods. Off J Eur Communities L248Google Scholar
- 20.Martínez JM, Muñoz E, Alba J, Lanzón A (1975) Informe sobre utilización del Analizador de Rendimientos “Abencor”. Grasas Aceites 26:379–385Google Scholar
- 22.Vázquez A, Janer C, Janer ML (1973) Determinación de los polifenoles totales del aceite de oliva. Grasas Aceites 24:350–355Google Scholar
- 23.Mateos R, Espartero JL, Trujillo M, Rios JJ, León-Camacho M, Alcudia F, Cert A (2001) Determination of phenols, flavons, and lignans in virgin olive oils by solid-phase extraction and high-performance liquid chromatography with diode array ultraviolet detection. J Agric Food Chem 49:2185–2192CrossRefGoogle Scholar
- 25.IUPAC (1992) Standard method 2.432: determination of tocopherols and tocotrienols in vegetable oils and fats by HPLC. In: Dieffenbacher A, Pocklington WD (eds) Standard Methods for the Analysis of Oils, Fats and Derivatives, vol 7. Blackwell, OxfordGoogle Scholar
- 32.Vekiari SA, Koutsaftakis A (2002) The effect of the different processing stages of olive fruit on the extracted olive oil polyphenol content. Grasas Aceites 53:304–308Google Scholar
- 35.Parenti A, Spugnoli P (2002) Influenza della temperatura delle paste di oliva sul contenuto polifenolico degli oil estratti. Riv Ital Sostanze Gr 79:97–100Google Scholar
- 36.Di Giovacchino L (1991) L’estrazione dell’olio con la centrifugazione diretta delle paste di oliva. Nota I: influenza della gramolazione. Riv Ital Sostanze Gr 68:413–420Google Scholar