Comparative analyses of sanitizing solutions on microbial reduction and quality of leafy greens

An effective and eco-friendly technology is needed to prevent postharvest loss of onion bulbs during cold storage. This study investigated the effect of gaseous ozone on the decay and quality of onion bulbs during storage at 2 °C and 70% relative humidity for two months. Gaseous ozone was adjusted to a concentration of 1.27 ± 0.024 ppm in the storage room by generating a high voltage discharge in air. After two months of storage, gaseous ozone significantly reduced the counts of aerobic bacteria (e.g., Rahnella aquatilis) and fungi (e.g., yeast and mold) in the onion bulbs by 4 log (CFU g−1) and 0.92 log (CFU g−1) compared with those of an untreated control, respectively. The microbial reduction by gaseous ozone resulted in a lower rotten rate of the onion bulbs, which was less than 20.0% compared with that of the untreated control. Moreover, the ozone exposure extended the storage life of the onion bulbs by delaying its color change and softening during storage. Our results suggest that gaseous ozone can control the decay of onion bulbs safely during storage.

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Impact of sanitizer solutions on microbial reduction and quality of fresh-cut pennywort (Centella asiatica) leaves

Journal of Food Science and Technology ◽

10.1007/s13197-021-05131-3 ◽

2021 ◽

Author(s):

Siti Zaharah Rosli ◽

Mohd Adzahan Noranizan ◽

Son Radu ◽

Roselina Karim ◽

Noraniza Mohd Adzahan ◽

...

Keyword(s):

Centella Asiatica ◽

Microbial Reduction ◽

Fresh Cut

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Impact of climate change and global trends on the microbial quality of leafy greens

Acta Horticulturae ◽

10.17660/actahortic.2018.1209.8 ◽

2018 ◽

pp. 51-56

Author(s):

A. Martínez-Sánchez ◽

A. Allende ◽

C. Luna ◽

M.V. Selma ◽

J.A. Tudela ◽

...

Keyword(s):

Climate Change ◽

Microbial Quality ◽

Global Trends ◽

Impact Of Climate Change ◽

Leafy Greens

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Microbial reduction and storage quality of fresh-cut cilantro washed with acidic electrolyzed water and aqueous ozone

Food Research International ◽

10.1016/j.foodres.2004.06.004 ◽

2004 ◽

Vol 37 (10) ◽

pp. 949-956 ◽

Cited By ~ 108

Author(s):

Hua Wang ◽

Hao Feng ◽

Yaguang Luo

Keyword(s):

Microbial Reduction ◽

Storage Quality ◽

Electrolyzed Water ◽

Fresh Cut ◽

And Storage

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Sampling and fieldwork practices in Europe: Analysis of methodological documentation from 1,537 surveys in five cross-national projects, 1981-2017

Methodology ◽

10.5964/meth.2795 ◽

2020 ◽

Vol 16 (3) ◽

pp. 186-207

Author(s):

Piotr Jabkowski ◽

Marta Kołczyńska

Keyword(s):

Survey Data ◽

National Survey ◽

Comparative Analyses ◽

National Surveys ◽

Samples And Sampling ◽

Survey Methodologies ◽

Over Time ◽

Selection Of ◽

Cross National

This article addresses the comparability of sampling and fieldwork with an analysis of methodological data describing 1,537 national surveys from five major comparative cross-national survey projects in Europe carried out in the period from 1981 to 2017. We describe the variation in the quality of the survey documentation, and in the survey methodologies themselves, focusing on survey procedures with respect to: 1) sampling frames, 2) types of survey samples and sampling designs, 3) within-household selection of target persons in address-based samples, 4) fieldwork execution and 5) fieldwork outcome rates. Our results show substantial differences in sample designs and fieldwork procedures across survey projects, as well as changes within projects over time. This variation invites caution when selecting data for analysis. We conclude with recommendations regarding the use of information about the survey process to select existing survey data for comparative analyses.

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Evaluation of the Microbiological Quality of Conventional and Organic Leafy Greens at the Time of Purchase from Retail Markets in Alexandria, Egypt

Polish Journal of Microbiology ◽

10.33073/pjm-2014-031 ◽

2014 ◽

Vol 63 (2) ◽

pp. 237-243 ◽

Cited By ~ 4

Author(s):

ROWAIDA KHALIL ◽

MOHAMED GOMAA

Keyword(s):

Food Safety ◽

Foodborne Pathogens ◽

Microbiological Quality ◽

Plate Method ◽

Street Vendors ◽

Retail Markets ◽

E Coli ◽

Leafy Greens ◽

Daily Diet

This is a pioneer study in Egypt that provides some assessment of the microbiological quality of conventional and organic leafy green vegetables that constitute an essential component of the Egyptians' daily diet. A total of 380 samples of unpackaged whole conventional and 84 packaged whole organic leafy greens were collected from retail markets in Alexandria, and analyzed for total aerobic mesophilic count (AMC) and total E. coli count (ECC) using the standard spread plate method. Mean AMC values for organic samples were statistically less (p < 0.05) than those of the corresponding conventional samples. Conventional radish and organic parsley samples had the highest AMC of 7.17 and 7.68 log CFU/g respectively, while conventional green cabbage and organic basil had the lowest AMC of 3.63 and 3.23 log CFU/g respectively. The presence of E. coli in 100% of the studied leafy greens was indicative of potential fecal contamination, in view of open and unhygienic environmental and unsanitary handling conditions, as leafy green items are available for sale by street-vendors. Unsatisfactory AMC and ECC levels encountered in the studied samples, warrant future investigations to determine the potential prevalence of foodborne pathogens, and to identify sources of dominating microorganisms, which could make a contribution to the field of food safety.

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Effect of different initial C/N ratio of cow manure and straw on microbial quality of compost

International Journal Of Recycling of Organic Waste in Agriculture ◽

10.1007/s40093-019-00308-5 ◽

2019 ◽

Vol 8 (S1) ◽

pp. 357-365

Author(s):

M. A. Macias-Corral ◽

J. A. Cueto-Wong ◽

J. Morán-Martínez ◽

L. Reynoso-Cuevas

Keyword(s):

Dairy Manure ◽

Microbial Reduction ◽

The Other ◽

Fecal Coliforms ◽

Microbial Quality ◽

Northern Mexico ◽

Log Reduction ◽

Helminth Eggs ◽

Initial Carbon

Abstract Purpose The effect of different initial carbon to nitrogen (C/N) ratios on the prevalence of Salmonella spp., fecal coliforms and helminth eggs over composts produced from several mixtures of maize straw (S) and dairy manure (M) was investigated. Methods Four C/N ratios (21, 22, 27, and 38) were evaluated, including one with manure only (C/N 21). The composting process was performed under field conditions in northern Mexico. Results The process lasted 51 days; Salmonella spp. was reduced 1–2 log (> 94%) in most treatments, except for the C/N ratio of 27 which achieved < 1 log reduction (about 35%). Fecal coliforms elimination was 3–4 log (> 99%) in all treatments while helminth eggs achieved < 1 log (72–87%, depending on treatment). In this study, the mixture with initial C/N ratio of 22 (25% S + 75% M), which had the lowest amount of straw, resulted in the highest elimination of Salmonella spp., fecal coliforms, and helminth eggs. This mix complied with current Mexican sanitary regulations for compost use. The composts produced from the other C/N ratios complied only with the limits for one or two of the microorganisms that were analyzed. Conclusions The initial C/N ratios in compost from straw and manure influences microbial reduction. The final C/N of the mixes ranged from 14 to 16, indicative of stable compost. Compared to fecal coliforms, Salmonella spp. and helminth eggs were more resilient.

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