Work of adhesion of dairy products on stainless steel surface

Abstract

The adhesion of the solids presents in food can difficult the process of surface cleaning and promotes the bacterial adhesion process and can trigger health problems. In our study, we used UHT whole milk, chocolate based milk and infant formula to evaluate the adhesion of Enterobacter sakazakii on stainless steel coupons, and we determine the work of adhesion by measuring the contact angle as well as measured the interfacial tension of the samples. In addition we evaluated the hydrophobicity of stainless steel after pre-conditioning with milk samples mentioned. E. sakazakii was able to adhere to stainless steel in large numbers in the presence of dairy products. The chocolate based milk obtained the lower contact angle with stainless steel surface, higher interfacial tension and consequently higher adhesion work. It was verified a tendency of decreasing the interfacial tension as a function of the increasing of protein content. The preconditioning of the stainless steel coupons with milk samples changed the hydrophobic characteristics of the surfaces and became them hydrophilic. Therefore, variations in the composition of the milk products affect parameters important that can influence the procedure of hygiene in surface used in food industry.

Environmental Parameters and Substrate Type Drive Microeukaryotic Community Structure During Short-Term Experimental Colonization in Subtropical Eutrophic Freshwaters

“…Some previous investigations studying bacterial and archaeal communities also recognized substrate type as a key factor affecting microbial community compositions (Sundberg et al, 2013;Ziganshin et al, 2013;Kalenitchenko et al, 2015). Obviously, properties of the substrates influenced microeukaryotic adhesion as has been shown for bacterial adhesion (Bernardes et al, 2012). In our study, those species with strong adhesion (sessile type) were more likely to be enriched on smooth surfaces of glass slides (Figure 7), on which other species are less able to live (Gong et al, 2005).…”

Species sorting during biofilm assembly by artificial substrates deployed in a cold seep system

“…In the present study, bacterial attachment is likely affected by the properties of the substratum. For example, both the surface roughness and hydrophobicity of the stainless steel influenced bacterial adhesion, as only species with a greater adhesion ability could attach 27 . There is evidence that Acinetobacter , which dominated the 3-day brine pool biofilms ( Fig.…”

Surface Quality and Free Energy Evaluation of s275 Steel by Shot Blasting, Abrasive Water Jet Texturing and Laser Surface Texturing

“…Campos et al [29] studied the application of different types of milk in steel samples to determine the degree of adhesion of Enterobacter sakazakii bacteria in these samples. For its evaluation, they studied its adhesion based on the contact angle obtained and the free surface energy that the steel presented when depositing these liquids.…”