Vânia Déa de Carvalho

Caracterização da composição química e do rendimento dos resíduos industriais do limão Tahiti (Citrus latifolia Tanaka)

The juice industry makes use of only 40 to 50% of the fruit and its remainder is considered industrial residue. This residue is very rich in some of its compounds such as pectin, ascorbic acid and dietary fibers making it into raw material for the food industry, pharmaceutics and animal food. With the purpose of using the industrial residue of Tahiti lime for such purposes, the centesimal composition, fiber contents, pectin and vitamin C contained in flavedo fractions, albedo and fruit pulp were characterized. From the evaluation for the Scott Knotts test to 5% of probability, it was observed that the ash content, pectin, protein, vitamin C and rude fiber were different for flavedo, albedo and pulp. Tahiti lime industrial residue has a great potential for animal food formulation, considering its chemical composition, as well as the fact that it can be used for fiber extraction, pectin, vitamin C and oils.

Efeito de diferentes tempos de cozimento nos teores de minerais em folhas de brócolis, couve-flor e couve (Brassica oleracea L.)

Foram determinados os teores de fosforo, calcio, potassio, magnesio e ferro das folhas de brocolis, couve-flor e folhas de couve. Os materiais estudados foram cultivados no municipio de Ijaci, MG, em diferentes tempos de cozimento (0, 2, 4, 6, 8 e 10 minutos), com o objetivo de verificar a utilizacao total dessas brassicas na alimentacao humana, as quais sao ricas fontes de minerais. Pelos resultados, constatou-se que as folhas de couve-flor, base umida, superaram as demais variedades na maioria dos minerais analisados. No entanto, a agua de cozimento reduziu o teor de minerais em todas as variedades avaliadas.

Efeito do cloreto de cálcio e do tratamento hidrotérmico na atividade enzimática e no teor de fenólicos do abacaxi

Pineapple ( Ananas comosus Mill.) is exposed to injuries caused by low temperature during the refrigerated storage. The post-harvest application of Ca may contribute to reduce a number of physiological disorders. In this work, the influence of the postharvest application of 2% CaCl 2 associated with hydrothermical treatment (38 oC and 40oC) for 10 and 20 minutes, on the chemical composition (enzymes, phenols), and susceptibility to internal browning of pineapple ‘Smooth Cayenne’ fruits was studied. The fruits were stored at 9 oC and 90% relative humidity for 15 days. The evaluations were performed seven days after removal of the fruits from the refrigerated conditions. The immersion of the fruits into a 2% CaCl 2 solution reduced the index of internal browning and diminished the activities of the enzymes polyphenoloxidase, peroxidase and phenilalanine ammonium lyase, as well as the content of phenolic compounds when associated with the hydrothermic treatment regardless to the immersion period.

Uso da vinhaça no abacaxizeiro em solo de baixo potencial de produção

3 /ha de vinhaAa e 20,5 g/planta de KCl , os rendimentos tiveram um acrOscimo de 70% e 73%, respectivamente, em relaAao ‡ testemunha. O fornecimento de K elevou a porcentagem de acidez titulAEvel total e sUlidos solœveis totais nos frutos, porOm nao houve diferenAa significativa entre as fontes. Os teores foliares de K foram aumentados significativamente pela aplicaAao de vinhaAa e de KCl, e os teores de Mg decresceram. A aplicaAao de vinhaAa contribuiu para aumento, no solo, dos teores dos cAEtions K, Ca, Mg e para a lixiviaAao de K. VinhaAa e KCl elevaram a nIveis adequados, para cultura, a porcentagem de K na soma de bases. Termos para indexaAao: resIduo de destilaria, potAEssio, produAao de abacaxi, Ananas comosus. STILLAGE APPLICATION FOR PINEAPPLE IN SOIL WITH LOW POTENTIAL OF YIELD ABSTRACT - An experiment was carried out in order to evaluate the stillage as K source for pine- apple (Ananas Comosus L.) in comparison with KCl, and the effects on chemical soil characteristics. The experiment was assessed in a Red Yellow Latosol with Smooth Cayenne cultivar. The treatments consisted of four application doses of stillage (0 - 100 - 200 - 400 m 3

TEORES DE POLIFENÓIS DE CAULE E FOLHA DE QUATRO CULTIVARES DE ABACAXIZEIRO

Teores de polifenois foram determinados nos residuos agricolas - caule e folha -do abacaxizeiro (Ananas comosus (L.) Merrill) das cultivares Perola, Perolera, Smooth Cayenne e Primavera, cultivadas em Ijaci-MG, com o objetivo de subsidiar a possivel utilizacao destes residuos para consumo humano e/ou animal. De acordo com os resultados obtidos, nenhuma das cultivares estudadas apresentou teores de polifenois acima de 1%, nivel considerado alto e prejudicial a digestibilidade de proteinas. A folha apresentou teores de polifenois superiores aos do caule em todas as cultivares analisadas. Nao houve diferencas significativas entre as cultivares, mas a Smooth Cayenne e a Perolera apresentaram os maiores e menores teores de polifenois, respectivamente.

Effect of calcium chloride and hydrothermical treatment on enzymatic activity and phenol content of pineapple

Pineapple ( Ananas comosus Mill.) is exposed to injuries caused by low temperature during the refrigerated storage. The post-harvest application of Ca may contribute to reduce a number of physiological disorders. In this work, the influence of the postharvest application of 2% CaCl 2 associated with hydrothermical treatment (38 oC and 40oC) for 10 and 20 minutes, on the chemical composition (enzymes, phenols), and susceptibility to internal browning of pineapple ‘Smooth Cayenne’ fruits was studied. The fruits were stored at 9 oC and 90% relative humidity for 15 days. The evaluations were performed seven days after removal of the fruits from the refrigerated conditions. The immersion of the fruits into a 2% CaCl 2 solution reduced the index of internal browning and diminished the activities of the enzymes polyphenoloxidase, peroxidase and phenilalanine ammonium lyase, as well as the content of phenolic compounds when associated with the hydrothermic treatment regardless to the immersion period.