Fresh-cut carrot (cv. Nantes) quality as affected by abiotic stress (heat shock and UV-C irradiation) pre-treatments

详细信息	查看全文 | 推荐本文 |

• 作者：Carla Alegria^a ; ^b ; ^{csmalegria@gmail.com} ; Joaquina Pinheiro^a ; ^{joaquina.pinheiro@gmail.com} ; Margarida Duthoit^a ; ^{margarida.duthoit@inrb.pt} ; Elsa M. Gonç ; alves^a ; ^{elsa.goncalves@inrb.pt} ; Margarida Moldã ; o-Martins^b ; Marta Abreu^a ; ^{marta.abreu@inrb.pt} ; ^{marta.mmn.abreu@gmail.com}
• 关键词：Abiotic stress ; Heat shock ; UV-C radiation ; Fresh-cut carrot ; Quality
• 刊名：Lebensmittel-Wissenschaft und -Technologie
• 出版年：2012
• 期刊代码：121_00236438
• 类别：abs
• 出版时间：October, 2012
• 卷：48
• 期：2
• 页码：197-203
• 文件大小：437 K

摘要

Abiotic stresses such as heat shock and UV-C irradiation can be used to induce synthesis of bioactive compounds and to prevent decay in fresh-cut fruits and vegetables. This study aimed to evaluate the effects of heat shock and UV-C radiation stress treatments, applied in whole carrots, on the overall quality of fresh-cut carrot cv. Nantes during storage (5聽掳C). Heat shock (HS, 100聽掳C/45聽s) and UV-C (0.78聽卤聽0.36聽kJ/m²) treated samples had higher phenolic content and exhibited reduced POD activities during storage when compared to control (Ctr) samples (200聽mg/L free chlorine/1聽min). All samples showed reduced carotenoid content considering raw material. Nonetheless, UV samples registered a three-fold increase in carotenoid content in subsequent storage. Fresh-cut carrot colour showed a continuous increase in whiteness index (WI) values during storage regardless of treatment without impairing visual quality. Respiratory metabolism was affected by both abiotic stress treatments since reduced O₂/CO₂ rates were found, more significant in HS samples. The decontamination effect was more expressive in HS samples, where a 2.5聽Log₁₀聽cfu/g reduction in initial microbial load and reduced microbial growth were achieved.