Dao Juliane, Stenchly Kathrin, Traoré Oumar, Amoah Philip, Buerkert Andreas
Organic Plant Production and Agroecosystems Research in the Tropics and Subtropics (OPATS), Universität Kassel, Steinstrasse 19, D-37213 Witzenhausen, Germany.
Laboratoire National de Santé Publique, 09 B.P. 24, Ouagadougou 09, Burkina Faso.
Foods. 2018 Dec 16;7(12):206. doi: 10.3390/foods7120206.
Vegetable production in urban gardens of Ouagadougou contributes to food security, but water for irrigation is often of low quality. This is particularly acute if irrigation water is taken from wastewater polluted channels. This study aimed at (i) verifying to what degree irrigation water quality is correlated with contamination of lettuce with , total coliforms, and spp., and (ii) assessing effects of post-harvest handling on pathogen development during the trade chain. We tested pathogen removal efficiency on lettuce by applying post-harvest washing. Irrigation water of production areas in Ouagadougou ( = 10) showed a mean load of 2.1 × 10⁵ CFU 100 mL. In 60% of the cases, irrigation water did not meet the standards of the World Health Organization (WHO) for safe irrigation water, and in 30% of the cases, irrigation water was contaminated with spp. Loads of total coliforms on lettuce leaves ranged from 2.9 × 10³ CFU g to 1.3 × 10⁶ CFU g, while averaged 1.1 × 10² CFU g. Results on post-harvest handling revealed that microbial loads increased along the trade chain. Overall, half of all lettuce samples ( = 60) were tested positively for spp. The experiment showed that appropriate post-harvest handling could prevent the increase of total coliforms.
瓦加杜古城市菜园的蔬菜生产有助于粮食安全，但灌溉用水质量往往较低。如果灌溉用水取自受污染的废水渠道，这一问题就尤为严重。本研究旨在（i）验证灌溉水质量与生菜被 、总大肠菌群和 spp.污染的程度之间的相关性，以及（ii）评估收获后处理对贸易链中病原体生长的影响。我们通过收获后清洗测试了生菜上病原体的去除效率。瓦加杜古生产区的灌溉水（ = 10）显示平均 负荷为2.1×10⁵ CFU 100 mL。在60%的情况下，灌溉水不符合世界卫生组织（WHO）安全灌溉水的标准，在30%的情况下，灌溉水被 spp.污染。生菜叶上总大肠菌群的负荷范围为2.9×10³ CFU g至1.3×10⁶ CFU g，而 平均为1.1×10² CFU g。收获后处理的结果表明，微生物负荷在贸易链中增加。总体而言，所有生菜样本（ = 60）中有一半检测出 spp.呈阳性。实验表明，适当的收获后处理可以防止总大肠菌群的增加。
