Deacidification
Mostrando 13-24 de 29 artigos, teses e dissertações.
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13. Recuperação de solvente em miscelas oleo de soja/hexano utilizando tecnologia de membranas. / Soja/hexano solvent oil recovery in miscelas using technology of membranes.
Soybean oil is industrially obtained by hexane extraction, producing an oil/hexane miscella that is submitted to distillation for solvent recovery. The process with membranes present low energy consumption and have been proposed to replace or complete the traditional operations in removal of solvent. Furthermore, the use of this technology might result in co
Publicado em: 2005
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14. Desacidification of the oil of bran of rice for extration liquid-liquid. / Desacidificação do oleo de farelo de arroz por extração liquido-liquido.
The objective of this work was to evaluate the rice bran oil deacidification process by liquid-liquid extraction (LLE), in a continuous equipment, using aqueous ethanol as solvent. The alternative process was evaluated in terms of: ability to extract the free fatty acids; ability to minimize the neutral oil loss and, ability to preserve nutraceutical compoun
Publicado em: 2004
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15. Equilibrio de fases em sistemas compostos por triacilglicerois / acidos graxos / etanol hidratado
Vegetable oils contain some components that must be removed during the refining process such as: free fatty acids, phosphatides and metal traces. Free fatty acids are removed by chemical refining or physical refining. The first process is very versatile and applicable for ali raw materiais, but for high acidic oils, great loss of neutral oil may occur. In su
Publicado em: 2002
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16. Desacidificação de oleos vegetais por extração liquido-liquido : equilibrio de fases e simulação do processo
Vegetable oils can be deacidified by conventional process such as aIkaline and physical refining. AIkaline refining is applicable for all raw materiaIs, however, it can result in great losses of neutral oil. For high acidity oils, physical refining is aIso a possibility, but can cause undesirable alterations in color and reduction of stability to oxidation.
Publicado em: 2002
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17. Desacidificação de oleo de milho com etanol em coluna de discos rotativos (RDC)
Deacidification of com oil with ethanol by a continuous process was conduded in a perforated rotating-disc-contador (RDC). Since the phosphatides are insoluble in ethanol, different pre-treatments were performed such as degumming and bleahing to reduce the phosphorus content. Water degumming of crude com oil was more efficient than acid degumming with citric
Publicado em: 1996
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18. Paper Preservation—New Hope for Survival
Crumbling paper in books and documents issued after 1860 was impossible to rehabilitate until recently. The W. J. Barrow Laboratory for several years has made exhaustive tests which show that deacidification offers a new means of ensuring survival of important texts and documents. Books now must be taken apart for the process, but spray deacidification may p
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19. Permanence/Durability of the Book II: Test Data of Naturally Aged Papers and Permanence/Durability of the Book III: Spray Deacidification
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20. Quantum Requirement for Photosynthesis in Sedum praealtum during Two Phases of Crassulacean Acid Metabolism 1
The quantum requirement (QR) for photosynthesis in Sedum praealtum, a Crassulacean acid metabolism plant, was compared with that of wheat, a C3 plant, and maize, a C4 plant, at 30 C. During the deacidification phase in S. praealtum, approximately 16 moles quanta were absorbed per mole malate consumed. This is equivalent to 16 moles quanta per mole CO2 fixed,
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21. Patterns of Carbon Partitioning in Leaves of Crassulacean Acid Metabolism Species during Deacidification.
Carbohydrates stored during deacidification in the light were examined in 11 Crassulacean acid metabolism (CAM) species from widely separated taxa grown under uniform conditions. The hypothesis that NAD(P) malic enzyme CAM species store chloroplastic starch and glucans, and phosphoenolpyruvate carboxykinase species store extrachloroplastic sugars or polymers
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22. The Effect of Elevated Concentrations of Fructose 2,6-Bisphosphate on Carbon Metabolism during Deacidification in the Crassulacean Acid Metabolism Plant Kalanchöe daigremontiana 1
In C3 plants, the metabolite fructose 2,6-bisphosphate (Fru 2,6-P2) has an important role in the regulation of carbon partitioning during photosynthesis. To investigate the impact of Fru 2,6-P2 on carbon metabolism during Crassulacean acid metabolism (CAM), we have developed an Agrobacterium tumefaciens-mediated transformation system in order to alter geneti
American Society of Plant Physiologists.
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23. Inverse Diauxy in the Yeast Hansenula anomala: Mutants Derepressed for Malic Acid Utilization in the Presence of Glucose
Utilization of l-malic acid by yeast strain Hansenula anomala IGC 4380 is subject to glucose repression. Derepressed mutants were obtained with UV light by use of the nonmetabolizable glucose analog 2-deoxyglucose as a selective agent. Three mutant strains degraded l-malic acid in the presence of up to 30% (wt/vol) glucose and are of potential interest for t
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24. The Relation between Photosynthesis, Respiration, and Crassulacean Acid Metabolism in Leaf Slices of Aloe arborescens Mill 1
Leaves and leaf slices from Aloe arborescens Mill. were used to study the interrelations between Crassulacean acid metabolism, photosynthesis, and respiration. Oxygen exchange of leaf slices was measured polarographically. It was found that the photosynthetic utilization of stored malic acid resulted in a net evolution of oxygen. This oxygen production, and