کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4362797 1616252 2015 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Evaluation of microbial loads and the effects of antimicrobial sprays in postharvest handling of California walnuts
ترجمه فارسی عنوان
ارزیابی بارهای میکروبی و اثرات ضد اسپاسم ضد میکروبی در دوران پس از زایمان از گردو کالیفرنیا
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش تغذیه
چکیده انگلیسی


• Aerobic plate and Escherichia coli/coliform counts determined for inshell walnuts and kernels.
• Microbial counts increased during harvest and hulling steps.
• Microbial reductions during drying were small.
• Application of a peracetic acid spray after hulling had minimal impacts on microbial loads on walnuts.
• Kernels from walnuts with visibly damaged shells had significantly higher counts than kernels from intact shells.

Changes in aerobic plate count (APC) and Escherichia coli/coliform count (ECC) of inshell walnuts and walnut kernels were evaluated during commercial harvest and postharvest handling. APC and ECC for inshell walnuts collected from the tree were 6 and 4 log CFU/nut, respectively; counts increased by 1 log during harvest and hulling and decreased by 1 log during drying. Application of up to 200 ppm peracetic acid after hulling with or without a subsequent 2% lauric arginate spray reduced APC and ECC by less than 1 log CFU/nut; counts were not significantly different from the water control. A decrease in shell integrity was evident after drying: visible shell damage increased from 4 to 47% of walnuts after drying. Counts on kernels extracted from visibly intact walnuts from the tree were near the limit of detection (1.7 log CFU/nut). These counts increased by at least 1.4 log CFU/nut after hulling for both thin- and hard-shell cultivars. Microbial populations were 1.6–2.2 log CFU/nut higher for kernels from walnuts with broken shells than for kernels from walnuts with visibly intact shells before, but not after, drying. A better understanding of how microbial populations are affected by postharvest handling practices is important in the development of walnut-specific food safety programs.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Food Microbiology - Volume 48, June 2015, Pages 133–142
نویسندگان
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