کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6390014 1628393 2016 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Reference organism selection for microwave atmospheric pressure plasma jet treatment of young coconut liquid endosperm
ترجمه فارسی عنوان
ارگانیزم مرجع انتخابی برای جت مایکروویو تحت فشار جوی جو جوی در آندوسپرم مایع نارگیل جوان
کلمات کلیدی
اندوسپرم نارگیل، نوشیدنی میوه، پاستوریزه غیرطبیعی درمان جت پلاسما، انتخاب ارگانیسم ارگانیک،
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش تغذیه
چکیده انگلیسی


- Spoilage bacteria were isolated and challenged in plasma-treated coconut water.
- Inactivation rates of spoilage and disease-causing bacteria were compared.
- Inactivation rates were greater in higher plasma input power setting.
- Reactive oxygen species and ultraviolet radiation were generated by plasma.
- Salmonella spp. was identified as appropriate target organism.

This study identified a reference organism for the establishment of microwave atmospheric pressure plasma jet treatment of young coconut liquid endosperm. Three different, predominant spoilage bacteria were isolated from spoiled liquid endosperm and identified through 16S rDNA sequencing, prior to propagation and eventual challenge studies. Basic Local Alignment Search Tool comparisons revealed that the isolated spoilage bacteria were Klebsiella sp., Staphylococcus sp., and Kluyvera sp (%Identity 97.34-97.82%). The isolates were propagated to mid-stationary growth phase (17 h) and thereafter suspended in liquid endosperm. The inactivation rates of the spoilage isolates in liquid endosperm subjected to plasma jet at 450 and 650 W input power settings were determined and compared to those of pathogens Escherichia coli O157:H7, Salmonella enterica, and Listeria monocytogenes. Inactivation rates of all test organisms at 450 W (2.76-5.98 min) were significantly less (p < 0.05) than those at 650 W (1.86-3.11 min). In both power settings, S. enterica exhibited the significantly (p < 0.05) greatest resistance towards plasma treatment, while Staphylococcus sp. exhibited the least. Heat penetration studies in both power settings revealed that the temperature of the liquid endosperm did not significantly increase and did not reach bactericidal ranges (<30 °C) during plasma jet treatment, hence the observed inactivation were attributed to antimicrobial species generated by the plasma. Optical emission spectroscopy revealed that these antimicrobial species included atomic oxygen (777.41 and 844.67 nm) and ultraviolet radiation (200-280 nm). Thus, this study determined S. enterica as an appropriate target organism for the establishment of plasma jet process for coconut liquid endosperm, the inactivation rate of which shall be soon established in higher scale treatment process.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Food Control - Volume 69, November 2016, Pages 74-82
نویسندگان
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