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Forced-air, vacuum, and hydro precooling of cauliflower (Brassica oleracea L. var. botrytis cv. Freemont): part I. determination of precooling parameters 116
Alibas,Ilknur; Koksal,Nezihe.
The aim of the present study was to precool cauliflower using forced-air, vacuum and high and low flow hydro cooling methods. The weight of the precooled cauliflower heads (5000±5 g) was measured before they were placed in standard plastic crates. Cauliflower heads, whose initial temperature was 23.5 ± 0.5 ºC, were cooled until the temperature reached at 1 ºC. During the precooling process, time-dependent temperature and energy consumption were measured, and during vacuum precooling, the decreasing pressure values were recorded, and a curve of time-dependent pressure decrease (vacuum) was built. The most suitable cooling method to precool cauliflower in terms of cooling time and energy consumption was vacuum, followed by the high and low flow hydro and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cauliflower; Hydro cooling; Forced-air cooling; Vacuum cooling; Energy consumption; Weight loss.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612014000400013
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Integration of cooking and vacuum cooling of carrots in a same vessel 116
Rodrigues,Luiz Gustavo Gonçalves; Cavalheiro,Darlene; Schmidt,Franciny Campos; Laurindo,João Borges.
Cooked vegetables are commonly used in the preparation of ready-to-eat foods. The integration of cooking and cooling of carrots and vacuum cooling in a single vessel is described in this paper. The combination of different methods of cooking and vacuum cooling was investigated. Integrated processes of cooking and vacuum cooling in a same vessel enabled obtaining cooked and cooled carrots at the final temperature of 10 ºC, which is adequate for preparing ready-to-eat foods safely. When cooking and cooling steps were performed with the samples immersed in boiling water, the effective weight loss was approximately 3.6%. When the cooking step was performed with the samples in boiling water or steamed, and the vacuum cooling was applied after draining the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Carrots; Cooking; Vacuum cooling; Integrated process.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612012000100028
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กระบวนการลดอุณหภูมิแบบสุญญากาศของผักกาดหวาน (Lactuca sativa var. longefolla) 106
Thitipong Panyakham; Danai Boonyakiat; Pichaya Boonprasoom Poonlarp.
Research was aimed at studying the optimum vacuum cooling process of cos lettuce precooled from initial core temperature of 19-21 °C to the final core temperature of 4±1 °C. The experiment was carried out in a rectangular vacuum chamber having a volume of 14.98 m3. In the experiment, the final pressures for vacuum-cooled cos lettuce were set at three different levels namely, 5.5, 6.0 and 6.5 millibar. The ressures were were at the final pressure of 0.60 kPa and the holding time of 25 minutes. The total cooling time was 39 minutes and the energy consumption was 4.17 kwh per 200 kilograms of cos lettuce. The electricity cost was 0.067 baht per kilogram of fresh weight. The weight loss during precooled cos lettuce with the previous optimum parameters was...
Tipo: Collection Palavras-chave: Vacuum cooling; Cos lettuce; Temperature; Weight loss; ผักกาดหวาน; การลดอุณหภูมิโดยใช้ระบบสุญญากาศ; อุณหภูมิ; ความดัน; การสูญเสียน้ำหนัก.
Ano: 2011 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5184
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