Cleaning rate in the uniform cleaning stage for whey protein gel deposits

2002-12-01
XİN, H
Chen, XD
Özkan, Necati
The removal of a thermally induced whey protein concentrate (WPC) gel layer from the inner surface of a stainless steel tube was determined continuously and non-invasively by a rapid UV spectrophotometric method. Based on mass transfer theory and polymer dissolution concepts, the constant cleaning rates in the uniform stage were predicted. The viscosity and solubility of WPC gels at different temperatures were measured and used in the modelling prediction. The deviation of the prediction from the experimental results indicates a possible change of protein fragment size with temperature. The investigation of the dissolution of WPC gel in 0.5 wt% NaOH solutions showed a break-up of disulphide bonds between protein molecules. The significant increase of the SH group content with increasing dissolution temperature was in agreement with the assumption that protein fragment size decreases with increasing temperature.
FOOD AND BIOPRODUCTS PROCESSING

Suggestions

Removal of a model protein foulant from metal surfaces
Xin, H; CHEN, XİAO DONG; Özkan, Necati (2004-08-01)
Using precoated whey protein concentrate gel films as a model milk protein fouling material, the removal kinetics from the inner surface of a stainless steel tube were determined continuously and noninvasively by a rapid UV spectrophotometric method. The influences of temperature, flow velocity, and the amount of fouling on the cleaning behavior were evaluated. For the first time, a cleaning model combining polymer dissolution and boundary layer mass transfer has been used to describe the cleaning process. ...
Water Solubility Mechanical Barrier and Thermal Properties of Cross linked Whey Protein Isolate based Films
Zeynep, Üstünol; Mert, Behiç (2004-04-01)
Water solubility, thermal properties, tensile strength, percent elongation, oxygen permeability (OP), and water-vapor permeability (WVP) of cross-linked glycerol plasticized whey protein isolate films were studied to determine the effect of cross-linkers (glutaraldehyde, formaldehyde, dialdehyde starch, carbonyldiimidazole, and UV irradiation) on film properties. With the exception of UV treatment, solubility of the films decreased (P < 0.05) upon treatment of the film-forming solutions with chemical cross-...
Whey protein-based gel as a model material for studying initial cleaning mechanisms of milk fouling
XİN, H; Chen, XD; Özkan, Necati (2002-09-01)
The dissolution kinetics and mechanical properties of whey protein concentrate (WPC) gels were Investigated as part of a general study on cleaning mechanisms of milk fouling. The dissolution results showed that the WPC gel is a suitable model material to simulate milk fouling and the dissolution process is a major factor controlling the cleaning process. The hardness, elastic modulus, and fracture load of the WPC gels decreased significantly when they were treated with alkaline solution, indicating that cer...
Modelling of asymmetric membrane formation
Mchugh, A.j.; Yılmaz, Levent (American Chemical Society; 1986-09-01)
Asymmetric membranes are generally prepared by the phase inversion techniques, the principal steps of which involve casting a thin film of a homogeneous polymer solution onto a suitable substrate, followed by quenching in a nonsolvent bath to precipitate the membrane film. Since most studies of the process has been concerned with the development of specific preparation recipies, explanations of structure formation have generally been ad-hoc and qualitative. This paper presents the results of recent modellin...
Single-component layer-by-layer weak polyelectrolyte films and capsules: Loading and release of functional molecules
Kozlovskaya, V. A.; Kharlampieva, E. P.; Erel Göktepe, İrem; Sukhishvili, S. A. (2009-06-01)
Poly(carboxylic acid) hydrogel films and hollow capsules undergo reversible size changes in response to variations in pH and/or ionic strength. The films and capsules were obtained from hydrogenbonded poly-N-vinylpyrrolidone/poly(carboxylic acid) layer-by-layer films by chemical crosslinking of the polyacid, followed by pH-induced removal of poly-N-vinylpyrrolidone. Surface-attached hydrogel films present attractive matrices for reversible pH-stimulated loading and/or controlled release of large amounts of ...
Citation Formats
H. XİN, X. Chen, and N. Özkan, “Cleaning rate in the uniform cleaning stage for whey protein gel deposits,” FOOD AND BIOPRODUCTS PROCESSING, pp. 240–246, 2002, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/31246.