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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 a.

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Presentation on theme: "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 a."— Presentation transcript:

1 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 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 Universidad de Granada Universidad de Sevilla Instituto de la Grasa 1/18

2 Introduction 2/18

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

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

5 (1)It describes the features of glasses that are used in Olive Oil tasting. (2)Stability to avoid spillage. (3)The bottom of the glass must be prepared to homogenize the temperature of the oil. (4)The geometry of the glass must preserve the bouquet of the oil. (5)The glass must be dark to block the color of the oil. Standard COI/T.20/Doc.nº 5/18 June 1987 Agustí Romero, Joan Tous. Percepnet Introduction 3/18

6 Introduction 4/18

7 Introduction 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. Objective 4/18

8 Introduction 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. Is very different the color of different oils in different glasses? Does the color of one oil change when we change the glass? Is very different the color of two oils in the same glass? Objective 4/18

9 Material and method 5/18

10 Number of the glass Capacity (ml) Height (mm) Rims diameter (mm) Greater diameter (mm) Diameter at bottom (mm) Thickness of glass at bottom(mm) Thickness of the glass at side (mm) 1128,0061,00*45,82*68,24*40,00*6,70*2, ,00*61,1850,0071,06*24,00*6,24*2,60 3*142,00*63,5451,00*68,74*25,14*6,541,66 4*142,00*59,8250,2870,88*25,06*6,12*2, ,00*61,20*45,90*68,76*40,585,40*1,90 6*144,0060,50*46,1069,2034,00*4,381,70 7*160,0060,4049,2871,10*21,68*3,82*2, ,00*61,82*45,20*68,84*31,58*6,22*2, ,0059,7249,6070,40*27,665,72*2,62 10*144,0059,7449,82*71,08*26,70*7,36*2,66 11*148,0059,4449,7470,92*27,66*6,54*2,66 12*156,00*61,0849,4070,74*28,22*7,38*2,40 13*148,0060,5049,96*71,16*26,48*7,36*2,22 14*150,0060,38*48,04*71,04*28,00*6,30*2,68 15*154,0059,3249,4270,50*30,784,70*1,18 16*142,0060,1049,6870,90*25,80*7,16*2, ,0060,98*43,1070,50*23,25*8,58*2,60 18*154,00*63,14*47,1070,90*30,20*7,84*2,14 Mean144,3360,7748,3070,2828,716,352,32 Standard deviation8,441,162,211,015,201,230,47 Material and method 18 standard tasting glasses 6/18 Standard glass130±1060±150±170±135±15±15±11,5±0,2 *Values out of the rule

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

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

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

14 Material and method SampleL* ab,10 a* 10 b* ,9714,35117,44 274,8515,66112,97 378,8717,30120,56 464,2613,18100,93 569,2811,42106,00 671,5210,90107,93 768,8712,04105,68 870,4512,27107,58 962,6212,5695, ,3111,21105,32 10 Spanish commercial extra-virgin olive oils. 10/18

15 Material and method 1.18 Standard tasting glasses Spanish extra-virgin olive oils. 3.3 different geometries. Total: 540 measures. 11/18

16 Results 12/18

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

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

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

22 Resultados Color diferencies in CIELAB units Oil0°30°60° MCDMSDMCDMSDMCDMSD 11,96 1,60 3,72 2,51 4,80 3,36 21,83 1,56 3,07 2,23 4,25 3,15 32,12 2,73 3,05 2,04 3,70 2,49 41,18 1,07 3,25 2,12 3,93 3,29 52,03 1,86 3,50 1,87 4,35 3,85 61,73 1,84 3,44 2,04 4,67 3,79 72,67 3,09 3,12 2,75 3,44 2,86 82,08 2,10 3,90 2,19 4,27 2,81 91,38 1,09 3,78 2,26 5,15 3,18 102,28 2,23 4,07 1,92 4,41 2,84 Mean/SD1,930,433,490,374,300,51 13/18 Does the color of one oil change when we change the glass? MCDM of oils in a 46,4 mm transparent Pyrex Glass*= 6,9 CIELAB units *L. Gómez-Robledo et al. JAOCS in press

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

24 Is very different the color of two oils in the same glass? Results 0°30°60° GlassMCDMSDMCDMSDMCDMSD 10,39 0,18 1,17 0,79 2,27 1,73 21,41 0,89 1,78 0,94 3,36 1,82 31,03 0,53 1,36 0,71 3,02 1,18 41,02 0,73 2,28 1,28 2,95 2,42 50,89 0,42 1,97 1,08 1,86 1,21 61,15 0,70 1,85 0,77 1,74 1,31 73,66 4,56 3,00 1,92 6,66 1,50 80,66 0,43 1,19 0,90 2,62 1,61 91,48 1,01 1,18 0,84 2,56 1,47 101,34 0,87 1,26 0,93 2,26 1,31 111,02 1,01 1,23 0,91 2,29 1,42 121,25 0,53 2,42 0,85 2,93 1,93 131,37 0,76 1,42 0,61 2,71 0,94 140,82 0,46 2,40 1,51 3,02 1,31 153,79 1,63 1,84 0,83 3,01 1,50 161,63 0,85 1,78 1,16 1,97 1,37 171,04 0,39 1,08 0,49 2,01 1,92 180,82 0,54 1,53 0,90 2,40 1,91 Mean/SD1,380,911,710,542,761,08 Mean Color Differences respect to the Mean 14/18 MCDM of oils in Pyrex Glass= 6,9 CIELAB units *L. Gómez-Robledo et al. JAOCS in press

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

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

27 Results Is very different the color of different oils in different glasses?

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

29 Results ΔE ab,10 SD 0°3,072,87 30°5,253,07 60°6,894, combinations for each geometry 16/18 Is very different the color of different oils in different glasses? *L. Gómez-Robledo et al. JAOCS 2008 (in press) Mean of measures in a 46,4 mm transparent Pyrex Glass* 10,967,23

30 Conclusions 17/18

31 Conclusions 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. 18/18

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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