Proceedings of Topical Meeting on Optoinformatics (pdf-format, 1.21 ...

More documents

Recommendations

Info

48 OPTOINFORMATICS’05 MILK HOLOGRAMS I. Olvera-Bautista 1 , S. Toxqui-López 2 , A. Olivares-Pérez 2 , M. Ortiz-Palacios 1 , E. L. Ponce-Lee 2 , M. P. Hernández-Garay 2 , I. Fuentes-Tapia 2 1 Instituto Tecnológico Superior de Atlixco (ITSA), Prolongación Heliotropo No. 1201 Col. Vista Hermosa, Atlixco, Puebla 2 Instituto Nacional de Astr<strong>of</strong>ísica Óptica y Electrónica (INAOE), Calle Luis Enrique Erro No. 1 Tonantzintla, Puebla, México E-mail: ivet_yvy17@yahoo.com.mx, stoxqui@inaoep.mx, olivares@inaoep.mx The studies preliminary show that milk can be us as replayed holographic recording medium consequently, we present analysis <strong>of</strong> the properties and preliminary experimental results. Milk is a very complex food with over 100,000 different molecular species found [1] . There are many factors that can affect milk composition such as breed variations (With all this in mind, only an approximate composition <strong>of</strong> milk can be given [2] : 87.3% water (range <strong>of</strong> 85.5% - 88.7%) , 3.9 % milkfat (range <strong>of</strong> 2.4% - 5.5%) and8.8% solids-not-fat (range <strong>of</strong> 7.9 - 10.0%) 3 , the carotenoid precursor <strong>of</strong> vitamin A, ß -carotene, contained in milk fat, is responsible for the 'creamy' colour <strong>of</strong> milk. Rib<strong>of</strong>lavin imparts a greenish colour to whey [4] . Refractive index (RI) is normally determined at 20° C with the D line <strong>of</strong> the sodium spectrum. The refractive index <strong>of</strong> milk is 1.3440 to 1.3485 and can be used to estimate total solids [5] . In this research pasteurized milk used as coating holographic film. The coating film is obtained when the milk is poured into a substrate, the poured can be in different form one <strong>of</strong> then is per gravity other is used a spinner. We obtained the IR spectrum from the sample (milk) as a holographic film (Graphic 1). 97.8 97 96 95 94 93 892.69 783.98 705.61 92 91 3281.44 1993.29 1539.88 1462.15 1241.57 90 %T 89 88 2166.12 1638.37 87 86 1153.29 85 84 2853.10 1032.97 83 82 1744.06 81 80 2921.10 78.8 4000.0 3600 3200 2800 2400 2000 1800 1600 1400 1200 1000 800 650.0 cm-1 Graphic 1. IR spectrum transmittance Milk The spectrum shows diverse groups that correspond basically from amino acids these have a common part into molecule that they consist <strong>of</strong> a group amino (NH3) which appear at 892.65 cm -1 , 783.98 cm - 1, 705.61 cm - 1, 1539.881 cm -1 ,1638.37 cm -1 , acid group (COOH) [6] 3281.44 cm -1 , OH group in 1462.15 cm -1 , other bands indicate the union carbon - hydrogen <strong>of</strong> the principal chains that they form, also some groups typical <strong>of</strong> some amino acids as SH group basically in the cysteine at 1032.97 cm -1 , and some components <strong>of</strong> the milk as the phosphate at1241.57 cm -1 . [7] We get the thickness from the coating holographic milk film as function <strong>of</strong> all milk contains (Graphic 2), also the index refraction as function drying time (graphic 3) and the
SAINT-PETERSBURG, October 17 – 20, 2005 49 diffraction efficiency that can be obtained when replicated some holograms depending <strong>of</strong> like the holographic film is obtained (Graphic 4, 5). Film thickness milk Index refraction change % Dif f r action Ef f iciency Milk (Emptied gr avity) 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 0 0.2 0.4 0.6 Ser i es1 1.356 1.355 1.354 1.353 1.352 1.351 1.35 1.349 1.348 0 5 10 15 Ser i es1 16 14 12 10 8 6 4 2 0 -2 0 5 10 15 Ser i es 1 ml . mi l k Time (s) Time (s) Graphic 2. Film thickness milk Graphic 3. Milk index refraction change Graphic4. Diffraction efficiency milk (emptied gravity) The sample(milk) is put on substrate 6.25cm 2 area, and the thickness increased in agreement to quantity added sample s let us determine the quantity <strong>of</strong> sample that we need to recording hologram the good thickness is in 0.01 mm that correspond 0.01 ml . Diffraction efficiency milk (seconds) 10 5 0 0 2 4 6 Serie 1 Time exposure( s) Graphic 5. Diffraction efficiency milk (s) We can observed that the gravity method has efficiency is 13.92 % to 4 seconds, on the other hand the spinner method, the diffraction efficiency is 9.08 % when the film exposure 2 second. The results present a good viability to record holograms in milk however it presents a low efficiency nevertheless this one to future can be doped increase diffraction efficiency. 1. Badui, D. S Diccionario de tecnología de los alimentos; 1 a Edition Addison Wesley Longman, México 1998; p 185. 2. R. A. Day Jr, A. L. Underwood. Química analítica cuantitativa; 1 a Edition Pretice Hall; México, 1989; p 466. 3. http://www.foodsci.uoguelph.ca/dairyedu/chem.html 4. Douglas A. S., et al; Química analítica; Sexta edición; Editorial Mc Graw Hill; Colombia; 1998, p 612. 5. Badui D. S, Química de los alimentos: 1 a Edition Pearson Educación;México, 1993, p36. 6. Osborne y P. Voogt, Análisis de los Nutrientes de los Alimentos; 1 a Edition, Acribia, S.A. Zaragoza, España 1986.p 125. 7. http://www.sso.cl/alimentos2.htm 8. http://www.sagarpa.gob.mx/Dgg/NOM/nom155scfi.pdf
Page 1 and 2: IV International Conference for Stu
Page 3 and 4: SAINT-PETERSBURG, October 17 - 20,
Page 47: SAINT-PETERSBURG, October 17 - 20,
Page 67: SAINT-PETERSBURG, October 17 - 20,

Proceedings of Topical Meeting on Optoinformatics (pdf-format, 1.21 ...

Create successful ePaper yourself

Delete template?

Save as template?