Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.14/2678
Título: Biochemical and colour changes of watercress (Nasturtium officinale R. Br.) during freezing and frozen storage
Autor: Gonçalves, E.M.
Cruz, R.M.S.
Abreu, M.
Brandão, T.R.S.
Silva, Cristina L.M.
Palavras-chave: Frozen watercress
Quality parameters
Peroxidase activity
Kinetics
Data: 2009
Editora: Elsevier
Citação: "Journal of Food Engineering". ISSN 0260-8774. 93: 1 (2009) 32–39
Resumo: The effects of water blanching, freezing, and frozen storage during 400 days at three different temperatures ( 7, 15 and 30 C), on watercress (Nasturtium officinale R. Br.) colour Hunter Lab parameters,chlorophyll degradation, vitamin C content loss and peroxidase (POD) activity were evaluated. The blanching induced significant changes on colour values and chlorophylls and vitamin C contents. POD activity was reduced 85% from its initial value. Freezing did not affect chlorophylls and vitamin C levels, however, promoted significant differences in colour values and POD residual activity. During frozen storage, ascorbic acid (AA) and POD activity Degradations followed first-order kinetics, and colour parameters (LH aH bH, aH/bH, LH aH/bH, LH/aH bH and hue (h0 H)) were successfully described by zero-order kinetics. The storage temperature effect was successfully described by the Arrhenius law. Chlorophylls and dehydroascorbic acid (DHAA) contents were kept constant during frozen storage.
URI: http://hdl.handle.net/10400.14/2678
Versão do Editor: http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6T8J-4V8VS5S-2&_user=2460358&_coverDate=07%2F31%2F2009&_rdoc=6&_fmt=high&_orig=browse&_origin=browse&_zone=rslt_list_item&_srch=doc-info%28%23toc%235088%232009%23999069998%23986050%23FLA%23display%23Volume%29&_cdi=5088&_sort=d&_docanchor=&_ct=18&_acct=C000057417&_version=1&_urlVersion=0&_userid=2460358&md5=d6322fea8137bf3f0de811986d4493aa&searchtype=a
Aparece nas colecções:ESB - Artigos em revistas internacionais com Arbitragem / Papers in international journals with Peer-review

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