Catálogo de publicaciones

Fruit and vegetables are both major food products in their own right and key ingredients in many processed foods. There has been growing research on their importance to health and techniques to preserve the nutritional and sensory qualities desired by consumers. This major collection summarises some of the key themes in this recent research.

Part one looks at fruit, vegetables and health. There are chapters on the health benefits of increased fruit and vegetable consumption, antioxidants and improving the nutritional quality of processed fruits. Part two considers ways of managing safety and quality through the supply chain. A number of chapters discuss the production of fresh fruit and vegetables, looking at modelling, the use of HACCP systems and ways of maintaining postharvest quality. There are also two chapters on instrumentation for measuring quality. Two final chapters look at maintaining the safety and quality of processed fruit and vegetables. Part three reviews technologies to improve fruit and vegetable products. Two chapters consider how to extend the shelf-life of fruits and vegetables during cultivation. The following three chapters then consider how postharvest handling can improve quality, covering minimal processing, new modified atmosphere packaging techniques and the use of edible coatings. Two final chapters discuss two major recent technologies in processing fruit and vegetables: high pressure processing and the use of vacuum technology.

With its distinguished editor and international team of contributors, Fruit and vegetable processing provides an authoritative review of key research on measuring and improving the quality of both fresh and processed fruits and vegetables.

• Reviews recent research on improving the sensory, nutritional and functional qualities of fruit and vegetables, whether as fresh or processed products
• Examines the importance of fruits and vegetables in processed foods and outlines techniques to preserve the nutritional and sensory qualities desired by consumers
• Discusses two major technologies in processing fruits and vegetables: high pressure processing and the use of vacuum technology

La tesis se enfocó en el desarrollo de matrices vegetales fortificadas en calcio y ácido ascórbico, con bajo contenido de agua. Para tal fin se estudiaron diferentes métodos de fortificación y preservación de dos frutas de la provincia de Misiones: ananá y mora. Las frutas de ananá, seccionadas en láminas 6 mm de espesor, fueron impregnadas con calcio y ácido ascórbico y posteriormente secadas por diferentes métodos: secado con aire caliente, deshidratación osmótica y secado con pulsos de energía de microondas. A partir de la fruta de mora, se ensayó la elaboración y posterior secado de una lámina en base a pulpa de mora. Se analizaron las características de los productos deshidratados a través de propiedades físicas y nutricionales, durante el procesamiento y su posterior almacenamiento.El secado con aire caliente es un método tradicionalmente empleado para la deshidratación de alimentos de origen vegetal. La aplicación de pulsos de microondas al proceso de secado convectivo favoreció la velocidad de secado de rodajas de ananá. Se evaluaron los efectos de las condiciones de proceso sobre características físico-químicas, nutricionales y organolépticas de las frutas. Una vez analizados los resultados, se procedió a la selección delas condiciones de proceso que permitieran mantener en gran proporción las características de interés.En ananá se evaluó la eficiencia de la impregnación con lactato de calcio (Ca) y ácido ascórbico (AA) en medio isotónico (~12°Brix) e hipertónico (50°Brix), en función del incremento del contenido de estos nutrientes en la matriz vegetal y de los cambios en propiedades físicas(textura, color, microestructura) de la fruta. La aplicación de los métodos combinados de secado  resultó satisfactoria en la fruta de ananá. Sin embargo, en moras, la aplicación del proceso de deshidratación osmótica y el secado con energía de microondas no tuvo resultados positivos. Además, si bien con secado convectivo es posible la deshidratación de moras, el producto obtenido no cubre las expectativas sensoriales buscadas; por este motivo se elaboró láminas deshidratadas a partir de moras trituradas, adicionando los nutrientes en cuestión (AA y Ca), azúcares,pectina y ácido cítrico, en distintas proporciones. Finalmente, se seleccionó una formulación a partir de las características sensoriales y aptitud para la formación de una lámina en el posterior proceso de secado. El producto final es una lámina de fruta con bajo contenido de agua, flexible, color y sabor agradable.La estabilidad de los productos fortificados durante su almacenamiento fue evaluada teniendo en cuenta el nutriente más sensible a su degradación, el AA. Se modeló la pérdida de ácido ascórbico por medio de una cinética de primer orden con coeficiente variable con la humedad del producto.

Frying is one of the oldest and most widely-used of food processes. Its popularity relates to the speed with which a food is cooked, the distinctive flavour and texture frying gives the food and its contribution to increased shelf-life. As a result the process is used for a wide range of vegetable, meat and fish products, particularly ready meals and snack foods.

Edited by a leading authority in the field and with a distinguished international team of contributors, Frying provides an authoritative review of key issues in improving quality in the manufacture of fried products. Part one of the book sets the scene by looking at the differing types of fried products and their markets as well as at the regulatory context. It also includes an important discussion of the role of dietary lipids, the impact of frying on lipid intake and its influence on consumer health. Part two looks in detail at frying oils, their composition, the factors affecting frying oil quality and ways of measuring frying oil quality and authenticity. Part three looks at quality issues relating to fried products. There are chapters on two of the main types of fried product: pre-fried potato products such as French fries and the manufacture of potato crisps. Three final chapters look at effective process control of frying operations, flavour development in frying and fried foods and ways of analysing and improving the texture and colour of fried products.

Frying oils are the most important common influence on fried product quality. They not only need to withstand the stresses of high temperature in frying but also maintain their quality during subsequent product storage.

Frying: improving quality is a standard reference for the food industry and all those concerned with the quality of fried products.

• An authoritative review of the key issues in improving quality in the manufacture of fried products

Fuels and Energy from Renewable Resources is a result of the proceedings of a symposium of the same name, held at the 1977 Fall Meeting of the American Chemical Society. The book addresses the issue of energy planning and includes the incorporation of crop and conifer residues into the development of energy supply.
The text covers the different papers from multiple disciplines that discuss the full value of other resources. The papers also talk about the necessary amount of energy needed; the contribution of renewable resources; the possible uses of wood as an energy source and the competition that may arise from it; and the analysis of the usefulness of forest fuels. The pyrolysis-gasification-combustion process on wood; the logistics of energy resources; and other renewable resources, such as bagasse, manure, and waste, are also discussed.
The book is recommended for experts who are exploring resources for alternative and renewable energy and aiming to educate others about it.