تصميم وتصنيع وتقيم اداء جهاز لازالة الكولسترول والدهون من اللحوم المفرومة == Designing , Manufacturing and Performance evalution a Device for removal cholesterol and fats from the minced meats
Author name:
حسن هادي مهدي الربيعي
Supervisor name:
اسعد رحمان سعيد الحلفي | منير عبود جاسم الطائي
General topic:
Agricultural sciences
Specific topic:
Food
Degree:
Master
University:
University Of Basrah - Faculty Of Agriculture
Language:
Arabic
University location:
Basrah
First pages:
31T1779 - p.pdf
Abstract:
A device to remove cholesterol and fats from minced meat by using supercritical CO2 has been designed and manufactured . This device removes cholesterol and part of the fat from the meat and operates by static and dynamic methods . This device consists of a pump run by compressed air that increases CO2 pressure to supercritical pressure , and from a CO2 cylinder size 20 kg . It also consists of three units : the first unit separates cholesterol and fat from the meat , the second unit separates cholesterol and part of the fat from supercritical CO2 , and the third unit absorbs cholesterol only by using Calcium carbonate . Other Components of the device are the cooling unit, heating unit, pressure and temperature gauges and control valves distributed among the parts of the device , in addition to the safety valve .The parameter of the device performance such as pressure, temperature, time, density, viscosity, solubility, compression coefficient and diffusion coefficient were measured , and cholesterol percentages in fresh minced meat were calculated before and after supercritical CO2 treatment in both the static and dynamic methods . Moreover, the chemical , micrological , and sensory characteristics and the storage period of samples which undergo the pressure, temperature, and time conditions have been measured as well is studying the economical quality of the manufactured device .The results have shown the following : 1. The maximum time to get the supercritical pressure for CO2 75,85,and 95 bar by using a pressure increasing pump was 35,40,55 minutes respectively.2. The density of supercritical CO2 increased by increasing the pressure, and decreased with high temperatures . The highest value was 667.525 kg\ m3 at 95 bar pressure and a temperature of 35 Celsius.3. The viscosity of supercritical CO2 increased by increasing the pressure and decreased with high temperatures . The highest value get 52.71×10 - 6 Pa. sec. at 95 bar pressure and a temperature of 35 Celsius.b4. The compression coefficient of supercritical CO2 increased at high temperature and decreased by increasing pressure. The highest value was 0.6607 at 75bar pressure and a temperature of 55 Celsius .5. A new equation has been suggested to calculate the solubility of cholesterol in the supercritical CO2 where the time factor has been considered. This solubility reached 0.17803505 and 0.14450794 g. L - 1 by using the static and dynamic methods respectively at 95 bar pressure , a temperature of 35 Celsius, and 80 minute hold time .6. The diffusion coefficient of cholesterol in supercritical CO2 increased at high temperature and decreased by increasing pressure . The highest value were 3.12107 × 10 - 9 and 9.36322 ×10 - 9 m2. sec - 1 by using the static and dynamic methods respectively at 95 bar pressure , a temperature of 35 Celsius, and 80 minute hold time .7. The highest loss ratio of fat and cholesterol by using supercritical CO2 were 92.72 and 61.96 % for fat and 87.10 and 70.69% for cholesterol respectively by using the static and dynamic methods at 95 bar pressure , a temperature of 35 Celsius, and 80 minute hold time .8. The percentages of moisture, protein, fat , ash , and carbohydrate in fresh meat samples untreated with supercritical CO2 were 74.43, 19.1, 4.48, 1.21,0.78 % respectively, while in fresh meat samples which have been treated with supercritical CO2 have reached 72.50, 22.68, 1.56, 2.4,0.86 % and 71.67, 24.41, 0.4, 2.6 , 0.92 % by using dynamic and static methods respectively . The cholesterol loss ratios of samples treated with supercritical CO2 were 72.28 and 89% by using the dynamic and static methods respectively at 95 bar pressure , a temperature of 35 Celsius, and 80 minute hold time.9. The values of peroxide of a meat chilled samples untreated with supercritical CO2 have increased from 6.22 Mlamkavi \ kg of fat in fresh meat to 9.45 Mlamkavi \ kg of fat after 12 days of freezing period storage. The values of peroxide of frozen meat samples treated with supercritical CO2 , on the other hand ,have slightly increased from 3.46 Mlamkavi \ kg of fat (before storage) to 4.1 Mlamkavi \ kg of fat (after storage) and from 0.76 Mlamkavi \ kg of fat (before storage) to 1.1 Mlamkavi \ kg of fat (after storage) using the dynamic and static methods respectively at the same period of storage and the same temperature.10. The microbiological tests result of meat treated with supercritical CO2 have shown that there were no colonies can be counted in the total countof bacteria, coliform bacteria, gold aurous, and yeasts and molds. The detection has shown a negative value about the existence of Salmonella.11. The results sensory evaluation of barker made by meat that is treated with supercritical CO2 have shown that the dynamic method samples are may accepted among experienced arbitrators followed by the static method samples at 95 bar pressure , a temperature of 35 Celsius, and 80 minute hold time .12. the maximum production value of the manufactured device was 10kg/day of cholesterol - free meat and the part of fat ,and that it is economical
