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Interactions between water and EVOH food packaging films / Interacciones entre el agua y películas de EVOH para el envasado de alimentos Texto completo
2000
Aucejo, S. | Catalá, R. | Gavara, R.
The transport of water in four EVOH copolymers commonly used in high barrier food packages was characterized through permeation (continuous flow) and gravimetric experiments at different rela tive humidities and 23 ± 2°C. Water sorption isotherms were fitted with the D'Arcy and Watts' equa tion. From these data, the value of the solubility coefficient (S, as defined by Henry's law) was deter mined and was found constant within a 0.2-0.75 water activity (a w) range. Water uptake at the same a w increased as the EVOH ethylene content decreased. The permeability coefficient (P) for water through EVOH was determined as a function of water activity. The permeability was constant within the range of 0.3-0.75 a w and decreased with EVOH ethylene content. At high relative humidities (a w > 0.75) the value of permeability increased by up to two orders of magnitude. In this range, the higher the ethylene content the lesser the value of P.
Mostrar más [+] Menos [-]Handbook of food isotherms: water sorption parameters for food and food components
1982
Iglesias, H.A. | Chirife, J.
Effects of restriction of water and food intake on thermoregulation, food utilization and water economy in desert sheep
1994
Ahmed, M.M.M. | Abdelatif, A.M. (Institute of Animal Production, Department of Animal Husbandry, University of Khartoum, P.O. Box 32, Khartoum North (Sudan))
Effects of water and food deprivation on lactating Nubian goats
1983
Ali, K.E. | Mirghani, T.
Investigations were carried out on the effects of water and food deprivation on the milk yield, body weight, blood composition and urine volume of lactating Nubian goats. The animals survived 4 days of deprivation of either food or both food and water, but these treatments resulted in about 10 per cent loss in body weight, 85 per cent drop in urine volume, and cessation of milk production, but no significant changes in packed cell volume, serum sodium, potassium and total protein. The change in body weight could be reversed within 1 day, but the initial milk yield was not resumed during the 2 weeks immediately following restoration of food and water.
Mostrar más [+] Menos [-]Kinetics of water in solid food stuffs under soaking conditions
1989
Mohr, K.-H.
Water and food intakes of Canadian Holstein-Friesian cows in Ghana
1983
Kabuga, J.D. | Alhassan, W.S. (Dep. Animal Science, Univ. Science and Technology, Kumasi (Ghana))
Food intake and growth in chickens given food in the wet form with and without access to drinking water
1995
Yalda, A.Y. | Forbes, J.M. (Department of Animal Physiology and Nutrition, University of Leeds, Leeds LS2 9JT (United Kingdom))
Effect of the H(1)-receptor agonist betahistine on water and food intake in pygmy goats
Rossi, R. | Del Prete, E. | Scharrer, E.
Effect of prolactin inhibition on thermoregulation, water and food intakes in heat-stressed fat-tailed male lambs
1995
Salah, M.S. | Al-Shaikh, M.A. | Al-Saiadi, M.Y. | Mogawer, H.H. (King Saud University, College of Agriculture, Department of Animal Production, P. O. Box 2460, Ryiadh 11451 (Saudi Arabia))
The ratio of the water and food consumption of chickens and its significance in the chemotherapy of coccidiosis.
1996
Williams R.B.
