Combined approach consisting of slightly acidic electrolyzed water and chitosan coating to improve the internal quality of eggs during storage
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
Authors: Sheng, Xiaowei; Shu, Dengqun; Li, Yanjiao; Zhan, Zhewen; Yuan, Xingyun; Liu, Sanfeng; Wu, Hongxiang; Bing, San; Zang, Yitian
Abstract
BACKGROUND Slightly acidic electrolyzed water (SAEW) has been shown to offer a promising alternative for the inactivation of bacteria on egg surfaces, but the cuticle of the egg is damaged during this disinfection process. However, if SAEW disinfection is followed by chitosan (CS) coating treatment, this will construct a new membrane and prevent the loss of moisture and carbon dioxide through the damaged cuticle. Hence, the objective of this study was to investigate the efficacy of SAEW disinfection followed by CS coating treatment for improving the internal quality of eggs during 6 weeks of storage at 25 degrees C. RESULTS Scanning electron microscopy revealed that SAEW-treated eggs had deeper and wider cracks than control eggs stored between 0 and 21 days. Moreover, the depth and width of the cracks in the uncoated eggs increased as storage time increased. However, the CS coating method was successfully used on SAEW-disinfected eggs to construct a barrier against the negative effects of shell damage. After 6 weeks of storage at 25 degrees C, the yolk index, albumen pH, Haugh unit value and weight loss value of the SAEW + CS group were 0.31%, 9.01%, 63.72% and 5.35%, respectively. CONCLUSIONS A combination of SAEW and CS was more effective at maintaining internal egg quality than SAEW or CS treatments alone during storage. (c) 2020 Society of Chemical Industry
Study of Zoonotic Enteric Pathogens ofAtelerix algirusin Tenerife, Canary Islands, Spain
FRONTIERS IN VETERINARY SCIENCE
Authors: Izquierdo-Rodriguez, Elena; Martin-Carrillo, Natalia; Valladares, Basilio; Foronda, Pilar
Abstract
Atelerix algirusis an invasive species in the Canary Islands (Spain). There are few studies about the zoonotic pathogens this species could be hosting; therefore, this study was focused on analyzing causative agents of diarrhea in humans in feces from hedgehogs. A total of 45 fecal samples obtained in Tenerife (Canary Islands) were analyzed in this study using Biofire FilmArray gastrointestinal panel with an integrated Biofire FilmArray system. Forty-two (93.33%) of the samples presented at least one of the pathogens detected by the panel. The prevalence of four bacteria stands out as for enteropathogenicEscherichia coli(71.11%),Salmonella(66.67%),Clostridioides difficile(33.33%), andCampylobactersp. (22.22%), all of which were widely distributed along Tenerife. Besides, other pathogens were found,Cryptosporidiumsp. and enterotoxigenicE. colilt/st in 6.66% of the animals,Shigella/enteroinvasiveE. coliin 4.44%, andNorovirusGI/GII,Plesiomonas shigelloides, andVibriosp. in 2.22%. Of the hedgehogs, 26.66% were hosting just one pathogen, and the others showed coinfection: 24.44% hosted two, 31.11% hosted three, and 11.11% hosted four or more. The close contact with hedgehogs may imply the transmission of not only one causative agent of diarrhea but also multiple agents, since coinfection is highly prevalent. The lack of management measurements for this animal in the Canary Islands, the common habit of adopting hedgehogs from wildlife without veterinary control, and the fact that most of the hedgehogs studied belonged to highly populated areas imply a high risk of transmission of pathogens to humans.