Abstract
Existence of microorganisms, pesticide residue on fresh vegetables has a potential hazard to human health. The demand for safe green Chinese kale (Brassica oleracea var. alboglabra) has increased recently. Chinese kale is a healthy botanical attached to the Brassicaceae class. It contains numerous nutritional and phytochemical constituents beneficial for human health. Besides health benefits, this green vegetable also poses food safety concerns due to pathogen and pesticide residue during cultivation. Non-thermal physical technology like pulsed light (PL) will be a promising alternative to eradicate microbial and pesticide residue while preserving the best physicochemical properties and phytochemical components. This research evaluated the influence of different pulsed light intensities (1.2-10.8 J/cm2) on the removal of microbial load and pesticide residue as well as weight attrition, texture hardness, dry matter, vitamin C, total phenolic content in the treated Chinese kale. Results showed that pulsed light intensity 8.4 J/cm2 was appropriate to completely eliminate pathogenic bacteria such as Escherichia coli, Staphylococcus aureus, Salmonella; pesticide substances such as carbendazim, abamectin, cypermethrin, chlorpyrifos ethyl, mancozeb. At pulsed light intensity 8.4 J/cm2, weight attrition in the treated sample was lower than weight attrition in the untreated; meanwhile textural hardness, dry matter, ascorbic acid and total phenolic content remained higher in the treated sample compared to the untreated. The results reveals that the pulsed light technique should be applied as a promising decontamination approach for removal of the pathogen as well as pesticide residue with minor impact on physicochemical properties and phytochemical constituents.
Highlights
Chinese kale (Brassica oleracea var.alboglabra) contains abundant bioactive antioxidants and anticarcinogenic constituents such as sugar, organic acid, beta-caroten, ascorbic acid, glucosinolate, amino acid, phenolic and flavonoid contributing to human health.[1,2,3] Ascorbic acid poses as a powerful antioxidant, an enzyme cofactor, a cell-signalling regulator in different vital physiological reactions.[4]
Results showed that pulsed light intensity 8.4 J/cm[2] was appropriate to completely eliminate pathogenic bacteria such as Escherichia coli, Staphylococcus aureus, Salmonella; pesticide substances such as carbendazim, abamectin, cypermethrin, chlorpyrifos ethyl, mancozeb
At pulsed light intensity 8.4 J/ cm[2], weight attrition in the treated sample was lower than weight attrition in the untreated; textural hardness, dry matter, ascorbic acid and total phenolic content remained higher in the the treated sample compared to the untreated
Summary
Chinese kale (Brassica oleracea var.alboglabra) contains abundant bioactive antioxidants and anticarcinogenic constituents such as sugar, organic acid, beta-caroten, ascorbic acid, glucosinolate, amino acid, phenolic and flavonoid contributing to human health.[1,2,3] Ascorbic acid poses as a powerful antioxidant, an enzyme cofactor, a cell-signalling regulator in different vital physiological reactions.[4]. Microbial hazards are commonly originated from agricultural environment like poluted water ad contaminated soil. Food-borne illnesses were associated to the consumption of contaminated fruits and vegetables originated from pesticide residues or pathogenic microorganisms. Deposition of pesticide residues like carbendazim, abamectin, cypermethrin, chlorpyrifos ethyl, mancozeb on the surface of agricultural products induced to the serious health hazards like cancer, child defect, and neuroevolved turmoil.[9] Innnovative food safety interventions effectively suppressed germ epidemic and pesticide related dysfunctions.[10]
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