Peg Salt
Mostrando 13-24 de 54 artigos, teses e dissertações.
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13. Study of partition of ovomucoid protein in aqueous twophase systems and anionic or hydrophobic resins / Estudo da partição da proteína ovomucoide em sistemas aquosos bifásicos e em resinas aniônica ou hidrofóbica
In this work, the application of the liquid-liquid extraction technique with aqueous two-phase systems (ATPS) was evaluated for the separation of ovomucoid, an egg white protein. This technique is an advisable purification process applied to large scale since it provides a selective partition with high yields. The ATPS were composed by PEG 1500 and an inorga
Publicado em: 2009
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14. Um método verde e sensível para determinação de fenóis em amostras de água utilizando sistemas aquosos bifásicos / A greener and sensitive method for phenols determination in water samples using aqueous twophase systems
This work initially presents a brief review of aqueous two- phase systems (ATPS), including the history, principles and properties of the technique. Furthermore, a divulgation on green methods for determination of phenols in water is shown, since these substances have high toxicity. The disposal of phenolic compounds is regulated in several countries, includ
Publicado em: 2009
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15. Effect of salt and osmotic stresses on the germination of pepper seeds of different maturation stages
Germination percentage, seedling fresh weight and sensitivity index of the pepper (Capsicum annuum L. cv. Sera Demre) seed lots harvested 50, 60 and 70 days after the anthesis (daa) in 2001 and 2002 were determined under the salt (NaCl) and osmotic (PEG) stresses at the same water potentials of -0.3, -0.6 and -0.9 MPa. The objective was to study whether the
Brazilian Archives of Biology and Technology. Publicado em: 2008-10
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16. Influence of the temperature and type of salt on the phase equilibrium of peg 1500 + potassium phosphate and peg 1500 + sodium citrate aqueous two-phase systems
The present work analyzed the effect of the temperature and type of salt on the phase equilibrium of aqueous two-phase systems (ATPS) formed by poly (ethylene glycol) (PEG) 1500 + potassium phosphate, from (278.15 to 318.15) K, and PEG 1500 + sodium citrate, from (278.15 to 298.15) K. The rise of the temperature normally increased the slope of the tie line (
Química Nova. Publicado em: 2008
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17. Equilibrio liquido-liquido em sistemas aquosos bifasicos agua + PEG 8000 + sal : determinação experimental e modelagem termodinamica / Liquid-liquid equilibrium in aqueous bifasic systems water + PEG 8000 + salt : experimental determination and thermodynamic modelling
In this work, experimental data of the liquid-liquid equilibrium for the aqueous twophase systems water + PEG8000 + magnesium sulfate and water + PEG8000 + sodium sulfate were determined at 25 e 50°C. The compositions of both equilibrium phases were obtained by a gravimetric method, using the lyofilization (freeze-drying) technique for the water determinati
Publicado em: 2008
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18. Fotodegradação de polímeros solúveis em água e moléculas modelo via processos oxidativos avançados / Photodegradation of water soluble polymers and model molecules via advanced oxidative processes
The aim of this work was to investigate polymer photodegradation mechanisms and stabilizing agents. The course of photooxidative degradation of some water soluble polymers (poly(vinylpyrrolidone), PVP; poly(acrylamide), PAM and poly(ethylene glycol), PEG) in the presence of hydrogen peroxide, Fenton reagent and iron salt has been investigated. PVP showed the
Publicado em: 2008
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19. Avaliação do potencial fisiológico e métodos de condicionamento, secagem e armazenamento de sementes de pepino / Evaluation of the physiological potential and priming, drying and storage of cucumber seeds
The objectives of this research were to identify reliable methods to evaluate the physiological potential of cucumber seeds, verify the relationship between seed physiological potential and field performance, as well as to define a suitable procedures for seed priming, drying and storage. The study was conducted in two experimental phases using seed lots of
Publicado em: 2008
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20. Caracterização e purificação da enzima bromelina em sistema de duas fases aquosas PEG/Fosfato / Bromelain enzyme caracterization and purification using two aqueous phases system PEG/Phosphate
The bromelains are proteases from vegetable origin, obtained from several species of Bromeliaceae family, which are found in pineapple s stem and fruit. The bromelains uses are based on its proteolytic activity on food industries and mostly at Brazilian pharmaceutical industry. The bromelains has been documented by its therapeutic effects at all inflammatory
Publicado em: 2007
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21. Osmocondition of seeds of melon / Condicionamento osmótico de sementes de melão
The objective this work was verified the effect of osmocondition with polyethylem glycol 6000, nitrate of sodium and chloride of magnesium in germination and emergency of seedlings of melon. The experiments was carried in the laboratories belonging to the department of Vegetable Science of Universidade Federal Rural do Semi-Árido, Mossoró RN, during the mo
Publicado em: 2007
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22. SYNCHRONY BETWEEN CATALASES AND ASCORBATE PEROXIDASES IN COWPEA LEAVES PROTECTION AGAINST THE WATER AND SALT STRESS-INDUCED OXIDATIVE DAMAGE / Sincronia entre catalases e peroxidases de ascorbato na proteÃÃo contra danos oxidativos em folhas de feijÃo Caupi expostas aos estresses hÃdrico e salino
O estresse hÃdrico induzido por seca ou salinidade à a principal restriÃÃo ambiental à sobrevivÃncia das plantas e sustentabilidade das culturas, principalmente nas regiÃes semiÃridas, onde estÃo frequentemente associados a altas temperaturas e taxas de luminosidade. Uma grande parte dos efeitos destes estresses ambientais no metabolismo das plantas
Publicado em: 2007
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23. Extraction of amylase from fermentation broth in poly (Ethylene Glycol) salt aqueous two-phase system
Enzimas amilolíticas têm sido amplamente investigadas com a finalidade de melhorar os processos industriais para a degradação do amido. Foi determinado que a extração da enzima em sistema bifásico aquosos é um método aplicável para separação e purificação de biomoléculas em misturas. Vários sistemas compostos de soluções aquosas de polietil
Brazilian Archives of Biology and Technology. Publicado em: 2006-07
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24. Liquid-liquid equilibrium of water + PEG 8000 + magnesium sulfate or sodium sulfate aqueous two-phase systems at 35°C: experimental determination and thermodynamic modeling
Liquid-liquid extraction using aqueous two-phase systems is a highly efficient technique for separation and purification of biomolecules due to the mild properties of both liquid phases. Reliable data on the phase behavior of these systems are essential for the design and operation of new separation processes; several authors reported phase diagrams for poly
Brazilian Journal of Chemical Engineering. Publicado em: 2005-09