Title:	Evaluation of different oxygen, carbon dioxide and nitrogen combinations employed to extend the shelf life of fresh-cut collard greens.
Authors:	MORETTI, C. L. ARAÚJO, A. L. MATTOS, L. M.
Affiliation:	Embrapa Hortaliças, Brasília, DF.
Date Issued:	2003
Citation:	Horticultura Brasileira, Brasília, v. 21, n. 4, p. 676-680, out./dez. 2003.
Description:	Collard greens (Brassica oleracea var. acephala) “Manteiga” were harvested in commercial fields in Brasilia, Brazil, aiming to evaluate different oxygen, carbon dioxide and nitrogen combinations to extend the shelf life of the fresh-cut product. After harvest, leaves were taken to the postharvest laboratory, selected for external blemishes and minimally processed (3 mm thick) inside a cold room (13±2°C). After processing, fresh-cut collard greens were stored under two controlled atmosphere (CA) conditions (3% O2 , 4% CO2 ; 5% O2 , 5% CO2 /balance N2 ), and normal air (control), at 5°C (95±2% RH), for six days. Daily, minimally processed collard greens were evaluated for total vitamin C, total chlorophyll, total soluble solids content, and titratable acidity. Total vitamin C content decreased for all treatments during the storage period. Storage under CA conditions delayed total vitamin C degradation for both atmospheres studied. At the end of the storage period, fresh-cut collard greens stored under 3% O2 , 4% CO2 showed around 25% and 56% more vitamin C than the material stored under 5% O2 , 5% CO2 and control, respectively. Total chlorophyll content decreased during the storage period. At the end of the experiment, fresh-cut collard greens stored under 3% O2 , 4% CO2 showed 24% and 45% more total chlorophyll than the product stored under 5% O2 , 5% CO2 and control, respectively. CA storage delayed organic acid degradation. On the sixth day, freshcut collard greens stored under 3% O2 , 4% CO2 presented around 44% more organic acids than control. Total soluble solids content were not significantly affected.
Thesagro:	Brassica Oleracea Acephala Clorofila Couve Nitrogênio Oxigênio Processamento Mínimo Qualidade Vitamina C
NAL Thesaurus:	brix
Keywords:	Produto minimamente processado Vida útil Vida-de-prateleira Gás carbônico Atmosfera modificada Ácido ascórbico
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CNPH)