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经清洗后,中高浓度次氯酸钠、中性氧化电位水、过氧乙酸和二氧化氯气体均不会影响清洗后冰菜(结球莴苣)的营养和感官品质。

Moderate and high doses of sodium hypochlorite, neutral electrolyzed oxidizing water, peroxyacetic acid, and gaseous chlorine dioxide did not affect the nutritional and sensory qualities of fresh-cut Iceberg lettuce (Lactuca sativa Var. capitata L.) after washing.

机构信息

Department of Food Safety and Food Quality, Faculty of Bioscience Engineering, Ghent University, Coupure links 653, B-9000 Ghent, Belgium.

出版信息

J Agric Food Chem. 2009 May 27;57(10):4195-203. doi: 10.1021/jf803742v. Epub 2009 Apr 17.

Abstract

Besides the traditionally used sodium hypochlorite (20 and 200 mg L(-1)), alternative sanitizers such as peroxyacetic acid (80 and 250 mg L(-1)) and neutral electrolyzed oxidizing water (4.5 and 30 mg L(-1) free chlorine) as well as chlorine dioxide gas (1.54 mg L(-1)) were evaluated for their efficiency in reducing the microbial load of fresh-cut iceberg lettuce. An additional rinsing step with tap water and cooling of the sanitizing solutions, which are obvious for the fresh-cut industry, were not performed within the current study. The high doses of sodium hypochlorite and peroxyacetic acid tested within this study do not conform to the normally used concentrations within the fresh-cut industry. Neutral electrolyzed oxidizing water (30 mg L(-1)), peroxyacetic acid (250 mg L(-1)), and gaseous chlorine dioxide significantly reduced the total aerobic plate count of cut lettuce in comparison with water wash treatments alone. None of the treatments significantly affected the sensory quality of the lettuce, although small color changes were observed after colorimetric measurements. From a nutritional point of view water rinsing significantly decreased the vitamin C (maximum 35%) and phenol (maximum 17%) contents, but did not affect the carotenoid and α-tocopherol contents. Additional effects caused by adding a sanitizer to the wash water were not observed for vitamin C and phenols. Conversely, washing with 250 mg L(-1) peroxyacetic acid reduced the β-carotene content by about 30%, whereas using 200 mg L(-1) sodium hypochlorite reduced both the lactucaxanthin and the lutein contents by about 60%. Use of gaseous chlorine dioxide also had an impact on the lutein content (-18%). Furthermore, the α-tocopherol content was reduced by 19.7 and 15.4% when the two concentrations of neutral electrolyzed oxidizing water were used, respectively. These data represent the situation on day 0. In a next phase, shelf-life studies considering microbial and sensory quality and nutrient content should be conducted.

摘要

除了传统使用的次氯酸钠(20 和 200mg/L),还评估了过氧乙酸(80 和 250mg/L)和中性电解氧化水(4.5 和 30mg/L 有效氯)以及二氧化氯气体(1.54mg/L)等替代消毒剂在降低新鲜切冰山生菜微生物负荷方面的效率。在当前研究中,没有进行额外的自来水冲洗和消毒剂冷却步骤,这对新鲜切行业来说是显而易见的。在这项研究中测试的高剂量次氯酸钠和过氧乙酸不符合新鲜切行业通常使用的浓度。与单独水洗处理相比,中性电解氧化水(30mg/L)、过氧乙酸(250mg/L)和气态二氧化氯显著降低了切生菜的总需氧平板计数。尽管在比色测量后观察到了小的颜色变化,但处理对生菜的感官质量没有显著影响。从营养角度来看,水冲洗显著降低了维生素 C(最大 35%)和酚类(最大 17%)的含量,但不影响类胡萝卜素和α-生育酚的含量。在洗涤水中添加消毒剂没有观察到对维生素 C 和酚类的其他影响。相反,用 250mg/L 过氧乙酸洗涤会降低约 30%的β-胡萝卜素含量,而用 200mg/L 次氯酸钠会降低约 60%的乳蓟黄素和叶黄素含量。使用气态二氧化氯也会对叶黄素含量产生影响(-18%)。此外,当使用两种浓度的中性电解氧化水时,α-生育酚含量分别降低了 19.7%和 15.4%。这些数据代表了第 0 天的情况。在下一阶段,应进行考虑微生物和感官质量以及营养成分的货架期研究。

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