Avaliou-se a expressão de ácidos graxos, macronutrientes e colesterol de camarões-da-malásia alimentados com dieta adicionada de sementes de linhaça. Quinhentos camarões foram distribuídos em dois grupos e alimentados durante 90 dias com dietas contendo: 1) lipídeo proveniente de linhaça e 2) óleo de soja (controle). A concentração de proteína foi maior (Р<0,05) para o grupo-linhaça, 15,8±0,09%, em relação ao grupo-controle, 15,2±0,04%. O peso corporal também se apresentou maior no grupo-linhaça, 1,38±0,93g, em relação ao grupo-controle, 0,93±0,48g. O grupo-linhaça apresentou teor de colesterol de 120,8±23,9mg/100g e o grupo-controle, 130,2±13,9mg/100g, porém sem diferença estatística significativa. Em relação ao perfil lipídico, a suplementação da dieta com linhaça influenciou a incorporação do ácido oleico (C18:1, ω-9) e melhorou a relação ω-6/ω-3 na carne do camarão (Р<0,05). Concluiu-se que a adição de linhaça à ração promoveu importantes modificações na qualidade nutricional dos tecidos do camarão.

The aim of the present study was to analyze the chemical composition of shrimp fed with a diet added of linseed flour. Five hundred post larvae shrimp were divided into two groups: a linseed group fed with a diet based on casein complemented with linseed and a control group, fed a diet without linseed flour. The cholesterol content for the linseed group was 120.8±23.9 mg/100g while for the control group it was 130.2±13.9 mg/100g. However, the protein content of 15.8±0.09 % and the body weight of 1.38±0.93g for the linseed group were higher than for the control group. It was concluded that the addition of linseed to the diet seems to increase the protein, weight and oleic acid (C18:1, ω-9) in the shrimp tissue. The ratio of polyunsaturated fatty acids/saturated fatty acids and ω-6/ω-3 for the linseed group was more suitable than for the control group.

Kraft bleached cellulose from Pinus radiata was submitted to methylation reactions in heterogeneous media. After activation with 29% (w/w) NaOH solution, methylation reactions were carried out both with dimethyl sulfate (DMS) and methyl iodide (MI). The effects of the pressing ratio, reaction time and type of methylation agent were studied. The better yields were obtained with dimethylsulphate and the pressing ratio and reaction time were not signficant over the yield. Methylcellulose (MC) of high degree of substitution was extracted with water and the MC of low degree of substitution was extracted with 8%w/w NaOH. Some of the MCs obtained were characterized by viscosity average molecular weight, thermal behavior, degree of substitution, steady shear solution behavior. The MC water extracted obtained under certain reaction conditions showed similar behavior that commercial MC

Celulosa blanqueada kraft proveniente de Pinus radiata fue sometida a reacciones de metilación en medio heterogéneo. Después de la activación con solución de NaOH al 29% p/p, las reacciones de metilación se realizaron tanto con sulfato de dimetilo (SDM) como con yoduro de metilo (YM). Fueron estudiados el efecto de la razón de prensado, tiempo de reacción y tipo de agente metilante. Los mejores rendimientos se obtuvieron con sulfato de dimetilo y no se encontró un efecto significativo de la relación de prensado y tiempo de reacción sobre el rendimiento. La metilcelulosa (MC) de mayor grado de sustitución se extrajo con agua y la de menor grado de sustitución con hidróxido de sodio al 8%. Algunas de las MCs obtenidas fueron caracterizadas de acuerdo a su peso molecular viscosimétrico, comportamiento térmico, grado de sustitución y comportamiento de sus soluciones bajo condiciones de cizalla en estado estacionario. La MC extraída con agua y obtenida bajo ciertas condiciones de reacción mostró similar comportamiento que la MC comercial