Portable forced-air tunnel evaluation for cooling products inside cold storage rooms

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Freezing process efficiency is affected by the required conditions to keep the air flow and temperature at the product surface. The objective of this work was to obtain results on comparative studies with air exhaustion and blowing using an experimental portable forced-air freezing tunnel. The device was designed to improve cooling rates inside storage room without the need for a cooling/freezing tunnel. A heterogeneity factor was proposed for air circulation evaluation and compared with convective heat transfer coefficient (h(ef)) values. Lower modules of heterogeneity factor values represent smaller temperature differences among samples. Comparing two different air flow processes, heterogeneity factor values were similar for regions where the cooling air could flow without obstructions. However, larger differences were observed for regions with hampered air circulation. Results indicated that the air distribution, as well as the heat transfer, occurs more uniformly around the products in the exhausting process than in the blowing system. (C) 2011 Elsevier Ltd and IIR. All rights reserved.351202208Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES

IMPROVEMENT OF FUNCTIONAL PROPERTIES OF RAPESEED PROTEIN CONCENTRATES PRODUCED VIA ALCOHOLIC PROCESSES BY THERMAL AND MECHANICAL TREATMENTS

Plant protein products produced via alcoholic extraction procedures often show a deterioration of their functional characteristics. The aim of this study was to modify rapeseed protein concentrates (RPCs) obtained by alcoholic extraction using different treatments in order to reconstitute their functional properties and to evaluate the influences of different modification procedures. It could be shown that a heat treatment at alkaline pH resulted in significant lower emulsification capacity (232 mL/g) but led to amelioration of water binding capacity (4.9 mL/g) and emulsion stability (95%). Heat treatment was also connected with loss in protein solubility whereas homogenization at high pressure revealed maintenance of protein solubility of the RPC concurrent with a significant higher emulsion capacity (357 mL/g) and emulsion stability (83%) in comparison with the untreated RPC (335 mL/g and 56%, respectively). Homogenization technique for RPC seems to be a promising tool for the development of applications in bakery or meat products. PRACTICAL APPLICATIONS The German Federal Ministry of Education and Research project Napus 2000 investigated how the use of rapeseed could be improved. The key objectives of this project were to utilize all the rapeseed and to use modern methods of genetic engineering in combination with classical plant cultivation to improve the rape products and so make a contribution to more healthy nutrition. More than 15 famous industrial partners and scientific institutions participated in this project. The key work fields in Napus 2000 were neutral lipids, proteins, antioxidants and polar lipids. The main work area of the Fraunhofer IVV was on proteins and this work covered the development of methods to recover proteins and potential applications of the rape protein products in foods.353369375BMB

Convective heat transfer coefficients evaluation for a portable forced air tunnel

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)The objective of this work was the determination of the convective heat transfer coefficient in order to evaluate an experimental portable forced-air freezing tunnel and work on comparative studies with air exhausting and blowing. The heat transfer coefficients of the cooling air and the product were analyzed during freezing process. Convective coefficient results were higher for air exhaustion than air blowing in every part of the batch, except for the upper layer of products, where the cooling air of the chamber was directly in contact with the product. These results, with the temperature analysis obtained, indicated that the air circulation around the samples, as well as the heat transfer, improved with the use of the portable system, and had better results for the exhaustion compared to the blowing process. (C) 2009 Elsevier Ltd. All rights reserved.3041700229233Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES

MODEL SOLUTIONS (CMC-SUCROSE) STABILITY EVALUATION AFTER SEVERAL FREEZING PROCESS

The objective of this paper was to evaluate the stability of the model solutions determining initial freezing temperature after repeated freezing process. The solutions were composed by water, sucrose and Carboxymethylcellulose (CMC). Were evaluated the concentrations of sucrose from 15% to 31.1% (w/w) and the concentration of CMC from 0.5%, 1.0% to 1.5% (w/w). It was also studied the possibility of reutilization of the model solutions for freezing tests. The results showed that at the concentration of 0.5% there was no alteration at the water binding capacity. The variation of sucrose concentration did not interfered in the stability of the solution during the study28112513