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Color Variation in standard Virgin-Olive-Oil Tasting Glasses

1/18. Universidad de Granada. Instituto de la Grasa. Universidad de Sevilla. Color Variation in standard Virgin-Olive-Oil Tasting Glasses. L. Gómez- Robledo a , M. Melgosa a , F.J. Heredia b , M.J. Moyano c , R. Roa a , R. Huertas a.

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Color Variation in standard Virgin-Olive-Oil Tasting Glasses

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  1. 1/18 Universidad de Granada Instituto de la Grasa Universidad de Sevilla Color Variation in standard Virgin-Olive-Oil Tasting Glasses L. Gómez-Robledoa, M. Melgosaa, F.J. Herediab, M.J. Moyanoc, R. Roaa, R. Huertasa a Basic and App. Colorimetry Lab.Departamento de Óptica, Facultad de Ciencias, Universidad de Granada, Spain, b Laboratorio de Bromatología , Facultad de Farmacia, Universidad de Sevilla,, Spain c Almazara Experimental del Instituto de la Grasa, CSIC, Sevilla, Spain

  2. 2/18 Introduction

  3. Introduction 3/18 Quality Control of Oils ChemicalAnalysis Sensorial Analysis J. Alba et al. Aceite de oliva virgen. Análisis Sensorial, 1997

  4. Introduction 3/18 J. Alba et al. Aceite de oliva virgen. Análisis Sensorial, 1997

  5. Introduction 3/18 Standard COI/T.20/Doc.nº 5/18 June 1987 • It describes the features of glasses that are used in Olive Oil tasting. • Stabilitytoavoidspillage. • The bottom of the glass must be prepared to homogenize the temperature of the oil. • The geometry of the glass must preserve the bouquet of the oil. • The glass must be dark to block the color of the oil. Agustí Romero, Joan Tous. Percepnet. 2005

  6. Introduction 4/18

  7. Introduction 4/18 Objective To check if the tasting glasses that are used in the official tasting (COI/T.20 rule) are able to avoid the taster to distinguish the color of the extra virgin olive oils.

  8. Introduction 4/18 Objective To check if the tasting glasses that are used in the official tasting (COI/T.20 rule) are able to avoid the taster to distinguish the color of the extra virgin olive oils. Does the color of one oil change when we change the glass? Is very different the color of two oils in the same glass? Is very different the color of different oils in different glasses?

  9. 5/18 Material and method

  10. Material and method 6/18 18 standard tasting glasses *Valuesout of the rule

  11. Material and method 7/18 SpectraScan PR-704 GretagMacbeth Spectralight III Cabinet Light source simulator D65 3 measures of each glass

  12. Material and method 8/18 Spectrum of the 18 glasses

  13. Material and method 9/18 • Color of the 18 glasses assuming: • D65 Illuminant • CIE64 Standard Observer

  14. Material and method 10/18 10 Spanish commercial extra-virgin olive oils.

  15. Material and method 11/18 18 Standard tastingglasses. 10 Spanishextra-virgin olive oils. 3 differentgeometries. Total: 540 measures.

  16. 12/18 Results

  17. Results 13/18 Does the color of one oil change when we change the glass?

  18. Results 13/18 Does the color of one oil change when we change the glass?

  19. Results 13/18 Does the color of one oil change when we change the glass?

  20. Results 13/18 Does the color of one oil change when we change the glass?

  21. Results 13/18 Does the color of one oil change when we change the glass? Mean Color Difference respect to the Mean R. Berns. 2000.

  22. Resultados 13/18 Does the color of one oil change when we change the glass? *L. Gómez-Robledo et al. JAOCS 2008. in press

  23. Results 14/18 Is very different the color of two oils in the same glass?

  24. Results 14/18 Is very different the color of two oils in the same glass? Mean Color Differences respect to the Mean *L. Gómez-Robledo et al. JAOCS 2008. in press

  25. Results 15/18 Is very different the color of different oils in different glasses?

  26. Results 15/18 Is very different the color of different oils in different glasses?

  27. Results 15/18 Is very different the color of different oils in different glasses?

  28. Results 15/18 Is very different the color of different oils in different glasses? 13770 combinations for each geometry

  29. Results 16/18 Is very different the color of different oils in different glasses? 13770 combinationsfor each geometry *L. Gómez-Robledo et al. JAOCS 2008 (in press)

  30. 17/18 Conclusions

  31. Conclusions 18/18 • The present tasting glasses obey the International Olive Oil Council rules in an acceptable way. The color differences are perceptible. • Manufactures must follow the dimensions of the standard glasses, adding a fixed color specification with corresponding tolerances. • Improve the sensorial analysis we propose two types: opaque glasses to a taste analysis and transparent glasses to a color sensorial analysis.

  32. Thanks a lot for your attention Aknowledments:Research Project P06-AGR-01744, Consejería de Innovación, Ciencia y Empresa; Junta de Andalucía (Spain).

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