DESARROLLO DE TÉCNICAS COMBINADAS DE SECADO CON AIRE CALIENTE Y MICROONDAS EN LA PRODUCCIÓN DE FIBRA ALIMENTARIA A PARTIR DE SUBPRODUCTOS CÍTRICOS

Tesis por compendio[EN] Sustainability is nowadays an investment for the future of any economic activity. The current situation of crisis has had an adverse impact in most industries, including the agri-food sector. However, this industry has been relatively the least affected when compared with other industrial sectors. This is mainly attributed to the fact that food products continue to be basic for consumers despite the economic downturn. Therefore, the agri-food sector is a key element in the European economy and can play a crucial role in the achievement of the objectives set in the EU's strategy for 2020: ensuring a sustainable framework of growth of a more competitive economy. The European agri-food industry has focused on energy efficiency and on reducing greenhouse gases emissions, along with better management of their resources as a way to improve its industrial competitiveness. In this sense, the search for solutions to transform the by-products generated in high value-added ingredients, is a priority. In this context, the juice industry, as fundamental sub-sector within the food sector, and large waste generator, must exploit the opportunity to transform their by-products into useful and profitable products for society. This transformation presents some difficulties which impede the profitability of the process. These difficulties are associated with the by-product, such as its compositional variability and its seasonality, and current techniques of transformation as the high energy cost in dehydration processes. This thesis represents an innovative and sustainable solution for overcoming the disadvantages associated with the high costs of stabilization, turning this by-products into high value-added ingredients, from both, nutritional and technological, points of view. The aim is to develop a microwave coupled with hot air drying technique allowing maximizing profits by using the following strategy: reducing time and operational costs, producing a new ingredient rich in dietary fiber, with interesting technological properties for the development of healthy foods, studying the proposed comprehensive process and analyzing the new generated by-products. The methodological approach of the thesis been focused, on the one hand, on studying phenomena that govern the internal transport of water and energy through the orange peel during its dehydration applying thermodynamics. On the other hand, the energy consumption of the drying process, the technological and sensory properties of the fiber obtained and its potential use as a fat substitute have been compared with the conventional hot air drying method. Finally, the integrated process, including both the combined drying technique and the pretreatments needed for colour and bitter compounds extraction, is proposed as a new route of valorization, in which the new by-products obtained, polyphenols and carotenoid rich extracts, are analysed. This study has analyzed the microwave coupled with hot air process, developing tools that allow the adequate upscaling of the drying operation by adapting it to the best standards of quality of the final product. A monitoring system that ensures these standards has been designed. The quality and the energy consumption of the dietary fiber production process has been improved. The properties associated with its inclusion in food matrices have been optimized. An innovative and sustainable process for the stabilization of industrial by-products and for their further conversion into dietary fiber and other bioactive compounds, applying microwave coupled with hot air drying, has been developed.[ES] La sostenibilidad es una de las apuestas de futuro en cualquier actividad económica. La situación de crisis ha tenido un impacto adverso en la mayoría de las industrias, incluyendo las de ámbito agroalimentario. Sin embargo, ésta ha sido relativamente la menos afectada cuando se compara con otros sectores industriales. Esto se atribuye al hecho de que los productos alimenticios continúan siendo básicos para los consumidores a pesar de la desaceleración económica. Por lo tanto, esta industria es un pilar fundamental en la economía europea y puede jugar un papel crucial en la consecución de los objetivos marcados en la Estrategia de la UE para 2020: asegurar un marco sostenible de crecimiento de una economía más competitiva. La industria agroalimentaria europea ha apostado por la eficiencia energética y la reducción de emisiones de gases invernadero, junto con una mejor gestión de sus recursos como vía para la mejora de su competitividad industrial. La búsqueda de soluciones para transformar los subproductos generados en ingredientes de alto valor añadido, es una de las prioridades. En este contexto, la industria productora de zumos, como subsector fundamental dentro del sector alimentario, y gran generador de residuos, tiene la oportunidad de transformar sus subproductos en productos útiles y rentables para la sociedad. Esta transformación presenta algunas dificultades que impiden la rentabilidad del proceso. Estas dificultades están asociadas al subproducto, como su variabilidad composicional o su estacionalidad, y a las técnicas actuales de transformación como el elevado coste energético en procesos de deshidratación. Esta tesis se plantea como una solución innovadora y sostenible para, más allá de superar los inconvenientes asociados a los altos costes de estabilización, transformar este subproducto en un ingrediente de alto valor añadido, tanto nutricional como tecnológico. Para ello se propone desarrollar una técnica de secado combinado por aire caliente y microondas que permita maximizar beneficios mediante la siguiente estrategia: reducir el tiempo y el coste energético de la operación, produciendo un nuevo ingrediente rico en fibra dietética con propiedades tecnológicas de interés para el desarrollo de alimentos más saludables, estudiando el proceso integral propuesto y analizando los nuevos subproductos generados. El enfoque metodológico de la tesis ha estado dirigido, por una parte, a estudiar los fenómenos que gobiernan el transporte interno de agua y energía a través de la piel de naranja durante su deshidratación, aplicando termodinámica. Por otra parte, el consumo energético del proceso de secado, las propiedades tecnológicas y sensoriales de la fibra obtenida y su potencial uso como ingrediente sustituto de grasa, se han comparado con el método de secado convencional por aire caliente. Finalmente, el proceso integrado, incluyendo tanto el secado combinado como las etapas previas de extracción de color y compuestos amargos, se propone como una nueva ruta de valorización, en la que se analizan posibles subproductos de interés tales como extractos ricos en polifenoles y carotenoides. En este estudio se ha analizado el proceso combinado de secado con aire caliente y microondas, desarrollando herramientas que permiten dimensionar adecuadamente la operación de secado adaptándola a los estándares óptimos de calidad del producto final. Se ha diseñado un sistema de monitorización que asegure dichos estándares. Se ha mejorado el proceso de obtención de fibra alimentaria respecto a su calidad y a su gasto energético. Se han optimizado las propiedades asociadas a su inclusión en matrices alimentarias. Se ha desarrollado un proceso innovador y sostenible para la estabilización de subproductos vegetales de origen industrial y para su posterior conversión en fibra dietética y otros compuestos bioactivos, aplicando la tecnología de secado por aire caliente y[CA] La sostenibilitat és una de les apostes de futur en qualsevol activitat econòmica. L'actual situació de crisi ha tingut un impacte advers en la majoria de les indústries, incloent les d'àmbit agroalimentari. No obstant això, la indústria agroalimentària ha sigut relativament la menys afectada quan es compara amb altres sectors industrials. Açò s'atribuïx principalment al fet de que els productes alimentaris continuen sent bàsics per als consumidors a pesar de la desacceleració econòmica. Per tant, esta indústria és un pilar fonamental en l'economia europea i pot jugar un paper crucial en la consecució dels objectius marcats en l'Estratègia de la UE per a 2020: assegurar un marc sostenible de creixement d'una economia més competitiva. La indústria agroalimentària europea ha apostat per l'eficiència energètica i la reducció d'emissions de gasos d'efecte hivernacle, junt amb una millor gestió dels seus recursos com a via per a la millora del seu vaig competirtu En este sentit, la busca de solucions per a transformar els subproductes generats en ingredients d'alt valor afegit, és una de les prioritats. En este context, la indústria productora de sucs, com subsector fonamental dins del sector alimentari, i gran generador de residus, té el deure i l'oportunitat de transformar els seus subproductes en productes útils i rendibles per a la societat. Esta transformació presenta algunes dificultats que impedixen la rendibilitat del procés. Estes dificultats estan associades al subproducte, com la seua variabilitat composicional o la seua estacionalitat, i a les tècniques actuals de transformació com l'elevat cost energètic en processos de deshidratació. Esta tesi es planteja com una solució innovadora i sostenible per a, més enllà de superar els inconvenients associats als alts costos d'estabilització, transformar este subproducte en un ingredient d'alt valor afegit, tant nutricional com tecnològic. Per a això es proposa desenvolupar una tècnica de'assecat combinat per aire calent i microones que permeta maximitzar beneficis per mitjà de l'estratègia següent: reduir el temps i el cost energètic de l'operació, produint un nou ingredient ric en fibra dietètica amb propietats tecnològiques d'interés per al desenvolupament d'aliments més saludables, estudiant el procés integral proposat i analitzant els nous subproductes generats. L'enfocament metodològic de la tesi ha estat dirigit, d'una banda, a estudiar els fenòmens que governen el transport intern d'aigua i energia a través de la pell de taronja durant la seua deshidratació, aplicant termodinàmica. D'altra banda, el consum energètic del procés de d'assecat, les propietats tecnològiques i sensorials de la fibra obtinguda i el seu potencial ús com a ingredient substitut de greix, s'han comparat amb el mètode d'assecat convencional per aire calent. Finalment, el procés integrat, incloent tant l'assecat combinat com les etapes prèvies d'extracció de color i compostos amargs, es proposa com una nova ruta de valoració, en la que s'analitzen possibles subproductes d'interés com ara extractes rics en polifenoles i carotenoides. En este estudi s'ha analitzat el procés combinat d'assecat amb aire calent i microones, desenvolupant ferramentes que permeten dimensionar adequadament l'operació d'assecat adaptant-la als estàndards òptims de qualitat del producte final. S'ha dissenyat un sistema de monitorització que assegure els dits estàndards. S'ha millorat el procés d'obtenció de fibra alimentaria respecte a la seua qualitat i al seu consum energètic. S'han optimitzat les propietats associades a la seua inclusió en matrius alimentàries. S'ha desenvolupat un procés innovador i sostenible per a l'estabilització de subproductes vegetals d'origen industrial i per a la seua posterior conversió en fibra dietètica i altres compostos bioactius, aplicant la tecnologia d'assecat por aire calent i microones.Talens Vila, C. (2015). DESARROLLO DE TÉCNICAS COMBINADAS DE SECADO CON AIRE CALIENTE Y MICROONDAS EN LA PRODUCCIÓN DE FIBRA ALIMENTARIA A PARTIR DE SUBPRODUCTOS CÍTRICOS [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/54114TESISCompendi

Study of the effect of microwave power coupled with hot air drying on orange peel by dielectric spectroscopy

[EN] Monitoring moisture and water activity during drying is crucial for process optimization, avoiding inadequate uses of energy. The main objective of this work was to study the dielectric properties of orange peel during hot air drying at 55 °C (HAD) and microwave power coupled with hot air drying at different power intensities (2 W/g, 4 W/g and 6 W/g). At 5, 15, 40, 60 and 120 min mass, aw, moisture, and permittivity were measured in fresh and dried samples. Results allowed developing a dielectric isotherm technique by adapting the GAB model to predict aw in dried orange peel by using ε'ε' (20 GHz). The physical meaning of the dielectric isotherm parameters (View the MathML sourceε0' and Cd) was studied. The value of View the MathML sourceε0' at 20 GHz (γ-dispersion) represents the induction effect of the minimum quantity of adsorbed water or the monomolecular moisture layer. The parameter Cd is related with isosteric heat, as well as the C parameter of the GAB model. The application of MW power produced an increase of isosteric heat or adsorption energy of the monomolecular layer, improving surface tension of samples and thus the hygroscopicity, explaining the reduction of the View the MathML sourceε0' independently of the quantity of the water molecules adsorbed.The authors would like to acknowledge the Basque Government for the financial support of the project (LasaiFood). The author Marta Castro-Giraldez wants to thanks to the UPV Postdoctoral Program (PAID-10-14) from Universidad Politecnica de Valencia for their support. The authors acknowledge the financial support from the Spanish Ministerio de Ciencia e Innovacion throughout the project AGL2011-30096.Talens Vila, C.; Castro Giraldez, M.; Fito Suñer, PJ. (2016). Study of the effect of microwave power coupled with hot air drying on orange peel by dielectric spectroscopy. LWT - Food Science and Technology. 66:622-628. https://doi.org/10.1016/j.lwt.2015.11.015S6226286

Effect of Microwave Power Coupled with Hot Air Drying on Sorption Isotherms and Microstructure of Orange Pee

[EN] Drying is one of the most cost-effective methods of worthwhile by-product valorisation. This study had two main objectives. The first was to determine the effect of hot air drying (HAD) combined with microwave (MW) irradiation on the treatment kinetics and the macrostructural and microstructural properties of the dried product. The second aim was to develop engineering tools to predict the extent of dehydration. Drying was performed using hot air at 55 A degrees C and the combined (HAD + MW) treatment at different power intensities (2, 4, and 6 W/g). After 5, 15, 40, 60, and 120 min, the mass, surface, volume, water activity and moisture were measured in fresh and dried samples. Sorption isotherms were obtained and fitted to the GAB model, with high correlation coefficients. The macroscopic and microscopic analyses showed shrinkage and swelling in the peel tissue caused by the MW treatment. The HAD + MW methods not only resulted in increased moisture reduction but also induced microstructural changes that generated higher sorption capacity.The authors would like to thank the Basque Government for the financial support of the project (LasaiFood). They also acknowledge the financial support from the Spanish Ministerio de Economia, Industria y Competitividad, Programa Estatal de I+D+i orientada a los Retos de la Sociedad AGL2016-80643-R. This paper is contribution no. 777 from AZTI (Food Research Division). The authors would like to thank the Electronic Microscopy Service of the Universidad Politecnica de Valencia for its assistance in the use of Cryo-SEM.Talens Vila, C.; Castro Giraldez, M.; Fito Suñer, PJ. (2018). Effect of Microwave Power Coupled with Hot Air Drying on Sorption Isotherms and Microstructure of Orange Pee. Food and Bioprocess Technology. 11(4):723-734. https://doi.org/10.1007/s11947-017-2041-xS723734114Al-Muhtaseb, A. H., McMinn, W. A. M., & Magee, T. R. A. (2002). Moisture sorption isotherm characteristics of food products: a review. Food and Bioproducts Processing, 80(2), 118–128. https://doi.org/10.1205/09603080252938753 .Andrade, R. D., Lemus, R., & Pérez, C. E. (2011). Models of sorption isotherms for food: uses and limitations. Vitae, 18(3), 325–334.Bejar, A. K., Ghanem, N., Mihoubi, D., Kechaou, N., & Mihoubi, N. B. (2011). Effect of infrared drying on drying kinetics, color, total phenols and water and oil holding capacities of orange (Citrus sinensis) peel and leaves. International Journal of Food Engineering, 7(5). https://doi.org/10.2202/1556-3758.2222 .Bergese, P. (2006). Specific heat, polarization and heat conduction in microwave heating systems: a nonequilibrium thermodynamic point of view. Acta Materialia, 54(7), 1843–1849. https://doi.org/10.1016/j.actamat.2005.11.042 .Castro-Giráldez, M., Fito, P. J., Chenoll, C., & Fito, P. (2010). Development of a dielectric spectroscopy technique for the determination of apple (Granny Smith) maturity. Innovative Food Science & Emerging Technologies, 11(4), 749–754. https://doi.org/10.1016/j.ifset.2010.08.002 .Castro-Giráldez, M., Fito, P. J., Dalla Rosa, M., & Fito, P. (2011a). Application of microwaves dielectric spectroscopy for controlling osmotic dehydration of kiwifruit (Actinidia deliciosa cv Hayward). Innovative Food Science & Emerging Technologies, 12(4), 623–627. https://doi.org/10.1016/j.ifset.2011.06.013 .Castro-Giráldez, M., Fito, P. J., & Fito, P. (2011b). Application of microwaves dielectric spectroscopy for controlling long time osmotic dehydration of parenchymatic apple tissue. Journal of Food Engineering, 104(2), 227–233. https://doi.org/10.1016/j.jfoodeng.2010.10.034 .Demirel, Y., & Sandler, S. I. (2001). Linear-nonequilibrium thermodynamics theory for coupled heat and mass transport. International Journal of Heat and Mass Transfer, 44(13), 2439–2451. https://doi.org/10.1016/S0017-9310(00)00291-X .Edrisi Sormoli, M., & Langrish, T. A. G. (2015). Moisture sorption isotherms and net isosteric heat of sorption for spray-dried pure orange juice powder. LWT—Food Science and Technology, 62(1, part 2), 875–882. https://doi.org/10.1016/j.lwt.2014.09.064 .Fava, F., Zanaroli, G., Vannini, L., Guerzoni, E., Bordoni, A., Viaggi, D., Robertson, J., Waldron, K., Bald, C., Esturo, A., Talens, C., Tueros, I., Cebrián, M., Sebők, A., Kuti, T., Broeze, J., Macias, M., & Brendle, H. G. (2013). New advances in the integrated management of food processing by-products in Europe: sustainable exploitation of fruit and cereal processing by-products with the production of new food products (NAMASTE EU). New Biotechnology, 30(6), 647–655. https://doi.org/10.1016/j.nbt.2013.05.001 .Fernández-López, J., Sendra-Nadal, E., Navarro, C., Sayas, E., Viuda-Martos, M., & Alvarez, J. A. P. (2009). Storage stability of a high dietary fibre powder from orange by-products. International Journal of Food Science and Technology, 44(4), 748–756. https://doi.org/10.1111/j.1365-2621.2008.01892.x .Ghanem, N., Mihoubi, D., Kechaou, N., & Mihoubi, N. B. (2012). Microwave dehydration of three citrus peel cultivars: effect on water and oil retention capacities, color, shrinkage and total phenols content. Industrial Crops and Products, 40, 167–177. https://doi.org/10.1016/j.indcrop.2012.03.009 .Gómez, A., López, R., Esturo, A., Bald, C., Tueros, I., Talens, C., & Raynaud, C. (2015). From waste products to raw materials for the development of new foods. Proceedings of the Institution of Civil Engineers: Waste and Resource Management, 168(2), 55–62. https://doi.org/10.1680/warm.13.00038 .Hossain, M. D., Bala, B. K., Hossain, M. A., & Mondol, M. R. A. (2001). Sorption isotherms and heat of sorption of pineapple. 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Trends in Food Science & Technology, 10(1), 3–8. https://doi.org/10.1016/S0924-2244(99)00016-3 .Martín, M. E., Martínez-Navarrete, N., Chiralt, A., & Fito, P. (2003). Diseño y construcción de una instalación experimental para el estudio de la cinética de secado combinado por aire caliente y microondas. Alimentación Equipos y Tecnología, 22(181), 101–107.Quirijns, E. J., van Boxtel, A. J. B., van Loon, W. K. P., & van Straten, G. (2005). Sorption isotherms, GAB parameters and isosteric heat of sorption. Journal of the Science of Food and Agriculture, 85(11), 1805–1814. https://doi.org/10.1002/jsfa.2140 .Rizvi, S. S. H., & Benado, A. L. (1984). Thermodynamic properties of dehydrated foods. Food Technology, 38(3), 83–92.Robertson, J. A., de Monredon, F. D., Dysseler, P., Guillon, F., Amado, R., & Thibault, J.-F. (2000). Hydration properties of dietary fibre and resistant starch: a European collaborative study. Lebensmittel-Wissenschaft und -Technologie, 33(2), 72–79. https://doi.org/10.1006/fstl.1999.0595 .Schieber, A., Stintzing, F. C., & Carle, R. (2001). By-products of plant food processing as a source of functional compounds—recent developments. Trends in Food Science & Technology, 12(11), 401−+.Schiffmann, R. (2001). Microwave processes for the food industry. In A. Datta & R. Anantheswaran (Eds.), Handbook of microwave Technology for Food Applications (pp. 299–352). New York: Marcel Dekker.Talens, C., Castro-Giráldez, M., & Fito, P. J. (2016a). A thermodynamic model for hot-air microwave drying of orange peel. Journal of Food Engineering, 175, 33–42. https://doi.org/10.1016/j.jfoodeng.2015.12.001 .Talens, C., Castro-Giráldez, M., & Fito, P. J. (2016b). Study of the effect of microwave power coupled with hot air drying on orange peel by dielectric spectroscopy. LWT - Food Science and Technology, 66, 622–628. https://doi.org/10.1016/j.lwt.2015.11.015 .Talens, C., Arboleya, J. C., Castro-Giraldez, M., & Fito, P. J. (2017). Effect of microwave power coupled with hot air drying on process efficiency and physico-chemical properties of a new dietary fibre ingredient obtained from orange peel. LWT - Food Science and Technology, 77, 110–118. https://doi.org/10.1016/j.lwt.2016.11.036 .Traffano-Schiffo, M. V., Castro-Giráldez, M., Fito, P. J., & Balaguer, N. (2014). Thermodynamic model of meat drying by infrared thermography. Journal of Food Engineering, 128, 103–110. https://doi.org/10.1016/j.jfoodeng.2013.12.024 .Traffano-Schiffo, M. V., Castro-Giráldez, M., Colom, R. J., & Fito, P. J. (2015). Study of the application of dielectric spectroscopy to predict the water activity of meat during drying process. Journal of Food Engineering, 166, 285–290. https://doi.org/10.1016/j.jfoodeng.2015.06.030 .van den Berg, C., & Bruin, S. (1981). Water activity and its estimation in food systems—theoretical aspects. In L. B. Rockland & G. F. Stewart (Eds.), Water Activity: Influences on Food Quality (pp. 1–61). New York: Academic Press. https://doi.org/10.1016/B978-0-12-591350-8.50007-3 .Waldron, K. W. (2009). Part III exploitation of co-products as food and feed ingredients. In K. W. Waldron (Ed.), Handbook of waste management and co-product recovery in food processing (pp. 255–265). UK: Elsevier Science. https://doi.org/10.1533/9781845697051 .Yan, Z., Sousa-Gallagher, M. J., & Oliveira, F. A. R. (2008). Sorption isotherms and moisture sorption hysteresis of intermediate moisture content banana. Journal of Food Engineering, 86(3), 342–348. https://doi.org/10.1016/j.jfoodeng.2007.10.009

Predicción del valor de actividad de agua de una disolución de electrolitos

La actividad de agua de una disolución de electrolitos, como por ejemplo una salmuera, es un factor fundamental a tener en cuenta si se desea mantener la estabilidad y calidad de un alimento durante un periodo de tiempo prolongado. La actividad de agua será considerada segura para un alimento si se proporcionan los datos adecuados que demuestren que el alimento a esa actividad de agua o por debajo de ella no permite el crecimiento de microorganismos.Pastor Navarro, C.; Talens Oliag, P. (2017). Predicción del valor de actividad de agua de una disolución de electrolitos. http://hdl.handle.net/10251/83394DE

Effect of microwave power coupled with hot air drying on process efficiency and physico-chemical properties of a new dietary fibre ingredient obtained from orange peel

[EN] Orange by-products are an excellent source of dietary fibre. The main objective of this work was to compare the physico-chemical and technological properties of fibres obtained from orange by-products by applying two different drying methods: hot air (HAD) and hot air coupled with microwave drying (HAD + MW). Process efficiency was also compared. 92% reduction in processing time and 77% reduction in energy consumption was achieved with HAD + MW. The drying treatment did not affect the physico-chemical properties of the fibres; however, the shrinkage-swelling phenomena that occurred during drying changed the rehydration properties of the fibre. HAD mainly affected the mechanical energy whereas HAD + MW affected the surface tension. An increase in particle size due to an increase in porosity during HAD + MW improved the fibre swelling capacity. HAD + MW can reduce drying time resulting in a more efficient drying process that positively affects the orange fibre's technological properties.The authors would like to acknowledge the Basque Government for the financial support of the project (LasaiFood). The author Marta Castro-Giraldez wants to thanks to the UPV Postdoctoral Program (PAID-10-14) from Universidad Politecnica de Valencia for their support. The authors acknowledge the financial support from the Spanish Ministerio de Economia, Industria y Competitividad, Programa Estatal de I + D + i orientada a los Retos de la Sociedad AGL2016-80643-R. This paper is contribution no 738 from AZTI (New Foods).Talens Vila, C.; Arboleya, JC.; Castro Giráldez, M.; Fito Suñer, PJ. (2017). Effect of microwave power coupled with hot air drying on process efficiency and physico-chemical properties of a new dietary fibre ingredient obtained from orange peel. LWT - Food Science and Technology. 77:110-118. https://doi.org/10.1016/j.lwt.2016.11.036S1101187

Hybrid sausages: modelling the effect of partial meat replacement with broccoli, upcycled brewer's spent grain and insect flours

The social, environmental and health concerns associated with the massive consumption of meat products has resulted in calls for a reduction in meat consumption. A simplex lattice design was used for studying the effect of combining broccoli, upcycled brewer’s spent grain (BSG) and insect flours from Tenebrio molitor (IF) as alternative sources of protein and micronutrients, in hybrid sausages formulation. The techno-functional properties of the ingredients and the nutritional and textural properties of nine hybrid sausages were analysed. The effect of adding these ingredients (constituting 35% of a turkey-based sausage) on protein, fat, fibre, iron and zinc content, and textural properties (Texture Profile Analysis (TPA) and Warner–Bratzler parameters) were modelled employing linear regression (0.72 < R2 < 1). The “desirability” function was used for multi-response optimisation of the samples for the highest protein content, optimum chewiness and a* value (closeness to red). The analysis of sensory data for the three optimised samples showed no significant differences in juiciness and odour between the hybrid meat sausage with 22% broccoli, 3% BSG, and 10% IF and the commercial Bratwurst sausage elaborated exclusively with animal protein. Colour, appearance, chewiness and pastiness were rated higher than for the reference. The instrumental chewiness highly correlated with sensorial chewiness (R2 = 0.98). Thus, a strategy introducing less refined and more sustainable sources of protein and micronutrients was successfully employed to model and statistically optimise a meat product formulation with reduced animal protein content.This research was financially supported by the Centre for the Development of Industrial Technology (CDTI) of the Spanish Ministry of Science and Innovation under the grant agreement: TECNOMIFOOD project (CER-20191010); and by the ELINUT project (2021-2022 Food Industry Framework, Basque Government). This is contribution n degrees 1131 of AZTI

New technique of combined hot air and microwave drying to produce a new fiber ingredient from industrial by-products

[EN] The search for solutions to transform the by-products generated by the agri-food sector in high value-added ingredients is a priority. The aim of this research was to develop a microwave coupled with hot air drying technique allowing maximizing profits by reducing time and operational costs and to produce a dietary fiber ingredient with interesting technological properties for the development of healthy foods. The shrinkage-swelling phenomena occurred during drying changed the rehydration properties of the fibre ingredient obtained. An increase in particle size improved the fibre's swelling capacity when hydrated, allowing 50 % fat substitution in potato purees.Talens, C.; Castro Giráldez, M.; Fito Suñer, PJ. (2018). New technique of combined hot air and microwave drying to produce a new fiber ingredient from industrial by-products. En IDS 2018. 21st International Drying Symposium Proceedings. Editorial Universitat Politècnica de València. 49-56. https://doi.org/10.4995/IDS2018.2018.7875OCS495

Gelatinas y colas para el uso en tratamientos de restauración. Estado de la cuestión

Las gelatinas y colas son sustancias proteicas de diferente pureza provenientes de la desnaturalización del colágeno. Debido a su origen natural variado y sus distintos procesos de extracción, pueden diferir en sus características físico-químicas. En ambos casos se trata de sustancias comúnmente utilizadas en la pintura tradicional y constituyen aún hoy en día uno de los materiales más versátiles empleados en los tratamientos de restauración. Aun tratándose de productos de características bien conocidas en el ámbito de la tecnología de los alimentos, la escasa información existente en torno a sus características, origen y composición en el campo de la conservación y restauración, hacen que su idoneidad y efectividad resulte a menudo cuestionable.Bailach Bartra, C.; Fuster López, L.; Yusa Marco, DJ.; Talens Oliag, P.; Vicente Palomino, S. (2011). Gelatinas y colas para el uso en tratamientos de restauración. Estado de la cuestión. Arché. (6):17-22. http://hdl.handle.net/10251/330411722