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Shredded and sliced carrot treated by H2O2 and stored in polymeric films, to the shelf-life improvement

AutorPlaza, José L. de la ; Gonzalo, Ana M.
Palabras clavecilled carrot
hydrogen peroxide
polymeric films
Fecha de publicación14-ene-2009
EditorUniversidade do Algarve
CitaciónInternational Conference ,FARO 2009 , "Environmentally friendly and safe technologies for quality of fruits and vegetables"
ResumenFresh carrot , treated or not by immersion during 30 seconds with hydrogen peroxide at 2%, were sliced or shredded and packed with polymeric film in about 250g weight bags, ready to use, and stored at 0ºC during 25 days.The two types of cutted fresh carrot as slices ( S ) of 3mm thick and grated (G ) ,were prepared in both cases using a rotative cutter.The two polymeric films used corresponds to polyethylene (PE) of 30µm thick ( P ) and oriented polypropylene (OPP, known as PPlus by Courtauls Seadlaw Flexible Packaging Ltd., London, England,UK)( C ), to constitute the batchs. The object of this essay is to study the effect of the conditioning and treatment method with H2O2 on the quality evolution, during the storage period. To study the possible effects on the quality , color ( external, section and puree), soluble solids as ºBrix +20ºC, total solids as % of initial fresh weight, titratable acidity as mg malic acid/100g, were analysed. Before cutting, the carrots were treated with 2% H2O2, 30 seconds immersion. After washing and drainning , the roots were included in the cutter and with the two differents blades, were directly packed in two PE bags at 0ºC during 4 hours and then distributed in the experimental sample units of about 250g, in PE or OPP, sealing by heat and stored at 0ºC for 25 days. The polymeric films used in the packaging were of two different types: oriented polypropylene (OPP), of high permeability (ca. 240,000 ml O2 m2 day-1atm-1 at 25ºC) supplied by the manufacturer (Sidlaw Flexible Packaging Ltd., London, England) with identification code 35PA240, corresponding to 35µm co-ex OPP plus antimist, and polyethylene (PE) of 30 µm thickness with unknown permeability data, manufactured by VTPlastics (Bilbao, España) with identification code PTB1 1F. The internal atmosphere composition in the bags, were higher in P than in C, as expected, being 4-5% CO2 in S,2/0.5 versus 8-10% CO2 in S,0/0 in PE, while in the case of OPP they arrive at only 1.2%CO2 in S,2/0.5 versus 1.75%CO2 in S,0/0.( being nomenclature as Film type ( S or C ), % H2O2 ( 2 or 0-control )/30sec=0,5 min or 0sec ) The best general aspect was in the case of S2/0.5 being the OPP the best include the control lot.
DescripciónComunicación Congreso"Environmentally Friendly ans safe Technologies for quality of Fruits and Vegetables"
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