Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.14/6733
Título: Microstructural analysis of fresh-cut red bell pepper (Capsicum annuum L.) for postharvest quality optimization
Autor: Fonseca, Susana C.
Silva, Cristina L.
Malcata, F. Xavier
Palavras-chave: Quality
Microstructure
SEM
Image analysis
Data: 2005
Editora: Universidade de Vigo
Citação: "Electronic Journal of Environmental, Agricultural and Food Chemistry" . ISSN 1579-4377. 4:5 (2005) 1081-185
Resumo: The main objective of this work was to evaluate the microstructure of fresh-cut red bell pepper (Capsicum annuum L.) after cutting, when maintained (for 0,4 and 7 d) under refrigerated storage (2°C). In order to assess the microstructure of the product, scanning electron microscopy (SEM) was applied; however, to improve this technique, preparation procedures and quantitative image analysis were specifically developed. Since sample preparation affects deeply image quality, three sample preparation procedures (viz. freezing by immersion in liquid nitrogen and subsequent storage at -80°C, freezing by storage at -80 °C and subsequent freeze-drying, and freezing by immersion in liquid nitrogen and subsequent freezedrying) were tested. One could also test (with success) a methodology of quantitative image analysis via a panel – a large number of people (N=25) rated the degree of cellular destruction, using a continuous scale (from 1- no cellular destruction to 9-extreme cellular destruction). Statistical analysis of the experimental data revealed that frozen samples exhibited higher cellular destruction than via the other two procedures; no statistically significant differences were observed between these two other procedures. Red bell pepper samples stored for 4 and 7 d presented (as expected) higher degree of cellular destruction than initial day samples. This work allowed one to develop appropriate preparation procedures of sample and quantitative image analysis – that will permit the application of this microscopy technique in future work in this area.
Peer review: yes
URI: http://hdl.handle.net/10400.14/6733
Aparece nas colecções:ESB - Artigos em revistas internacionais com Arbitragem / Papers in international journals with Peer-review

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