Abstract
Plasma treatment was widely known as an effective technology applied for contact-surface decontamination. Enoki (Flammulina velutipes) was an edible-medicinal mushroom with different phytochemicals and bioactive components beneficial for human health. Enoki mushroom had high respiration rate therefore it was highly perishable after harvesting. Moreover, it was greatly susceptible to microbial contamination but it was not feasible to be decontaminated by normal water washing. It’s urgent to extend shelf-life and control microbial criteria on this mushroom in dry manner without aqueous treatment. Corona discharge plasma was among 4 kinds of diverse cold atmospheric pressure plasma sources widely applied in food industry. This study demonstrated the influence of corona discharge plasma power values (control, 120, 150, 180, 210 W) on the physicochemical and microbial characteristics of Enoki mushroom during 10 days of storage at ambient temperature. Results showed that Enoki mushroom should be treated at 150 W of corona discharge plasma power to retain weight loss, total soluble solid, vitamin C in acceptable values while reducing total Aerobic count, Coliform, Enterobacteriaceae as much as possible. At the 10th day of storage, the weight loss, total soluble solid, vitamin C, total Aerobic count, Coliform, Enterobacteriaceae were recorded at 3.35±0.07%, 6.98±0.03 oBrix, 14.81±0.04 mg/100 g, 4.71±0.05 log CFU/g, 3.17±0.02 log CFU/g, 2.13±0.01 CFU/g, respectively. Findings of this research proved that corona discharge plasma pretreatment would be appropriate to maintain physicochemical properties and retard microbial loads on Enoki mushroom during preservation.
Highlights
Plasma treatments were widely applied in medicine, agriculture and postharvest sector
This study demonstrated the influence of corona discharge plasma power values on the physicochemical and microbial characteristics of Enoki mushroom during 10 days of storage at ambient temperature
Results showed that Enoki mushroom should be treated at 150 W of corona discharge plasma power to retain weight loss, total soluble solid, vitamin C in acceptable values while reducing total Aerobic count, Coliform, Enterobacteriaceae as much as possible
Summary
Plasma treatments were widely applied in medicine, agriculture and postharvest sector. Plasma jet treatment got a great attention due to its excellent efficacy in microbial decontamination proven on different products such as vegetable leaf, mung bean sprout, red chicory, citrus fruit.[32,33,34,35,36,37,38,39,40] In one report, plasma activated water was applied to manage postharvest quality of button mushroom.[41] In another study, pressure plasma jet was investigated the effectiveness of the treatment time to be effectively eliminate antimicrobial load on mushroom surface.[42] plasma treatment was proven to be efficient to inactivate microorganisms on product’s surface.[43,44,45,46] Shelf-life of raw Enoki mushroom was normally about 2-3 days at normal condition. Plasma treatment would be an efficient non-thermal treatment to avoid negative impact of heat on natural properties of this valuable mushroom
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