Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.14/2697
Título: The response of watercress (nasturtium officinale) to vacuum impregnation: Effect of an antifreeze protein type I
Autor: Cruz, Rui M.S.
Vieira, Margarida C.
Silva, Cristina L.M.
Palavras-chave: Watercress
Vacuum impregnation
Antifreeze protein type I
Freezing
Ice crystals
Microstructure
Data: 2009
Editora: Elsevier
Citação: "Journal of Food Engineering". ISSN 0260-8774. 95: 2 (2009) 339–345
Resumo: The setting up of methodologies that reduce the size of ice crystals and reduce or inhibit the recrystallisation phenomena could have an extraordinary significance in the final quality of frozen products and consequently bring out new market opportunities. In this work, the effect of an antifreeze protein type I (AFP-I), by vacuum impregnation (VI), on frozen watercress was studied. The VI pressure, samples’ weight, Hunter Lab colour, scanning electron microscopy (SEM), and a wilting test were analysed in this work. The water intake of watercress samples augmented with vacuum pressure increase. The results also showed that, independently from the vacuum pressure used, the Lab colour parameters between raw and impregnated samples were maintained, showing no significant differences (P > 0.05). A VI of 58 kPa, during 5 min, allowed impregnating the AFP-I solution (0.01 mg ml-1) into the watercress samples. The scanning electron microscopy (SEM) analysis showed the AFP-I impregnated frozen samples with better cell wall definition and rounded cell shape with smaller ice crystals compared with the control samples. The wilting test results corroborated that AFP-I is a valuable additive, since the leaves impregnated with AFP-I showed higher turgidity compared to the control samples. The present findings will help to better understand the effect of AFP-I, articularly, on frozen watercress microstructure and its importance as valuable food additive in frozen foods and mainly in leafy vegetables.
URI: http://hdl.handle.net/10400.14/2697
Versão do Editor: http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6T8J-4WBT41D-4&_user=2460358&_coverDate=11%2F30%2F2009&_rdoc=17&_fmt=high&_orig=browse&_origin=browse&_zone=rslt_list_item&_srch=doc-info%28%23toc%235088%232009%23999049997%231396052%23FLA%23display%23Volume%29&_cdi=5088&_sort=d&_docanchor=&_ct=21&_acct=C000057417&_version=1&_urlVersion=0&_userid=2460358&md5=af4c55a16a3e1c8396532ae5797bd221&searchtype=a
Aparece nas colecções:ESB - Artigos em revistas internacionais com Arbitragem / Papers in international journals with Peer-review

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