Environmentally and consumer-friendly poly(methyl methacrylate) (PMMA) microcapsules were prepared on the basis of an in situ polymerization reaction to encapsulate perfume oil, which aims be delivered fabric surfaces via liquid detergents. Microcapsules with a narrow size distribution produced using membrane emulsification system; results compared standard homogenization procedure. The shell thickness was found increase time, measured lipophilic fluorescent dye dissolved oil confocal laser...

Abstract The dissolution of whey protein concentrate (WPC) gels has been studied in detail, and the different mechanisms involved have quantitatively analyzed. NaOH diffusivity determined at pH 22°C. Dissolution experiments under several conditions performed compared. Both heat‐induced (HIG) caustic‐induced (CIG) as models to heat‐exchanger fouling deposits. It is proposed that constant rate observed low controlled by reactions break down gel structure, particularly β‐elimination...

It is well documented in the literature that during dissolution of whey protein gels alkali, swell to a great extent. However, relevance swelling step process gel remains unknown. In present article we systematic study on β-lactoglobulin at different alkaline pH and ionic strengths. The equilibrium degree conditions has been modeled using simple model developed for polyelectrolyte gels, modified take into account ionization residues protein. can describe behavior over wide range conditions,...

Abstract Characterization of the failure behavior microcapsules is extremely important to control release their core actives by mechanical forces. The strain and stress elastic‐plastic uninflated core–shell at (rupture or bursting) has been determined using finite element modeling (FEM) micromanipulation compression experiments. ductile polymeric high deformations considered occur when maximum in shell exceeds a critical strain, resulting rupture. FEM used determine strains present capsule...

The existence of a practical minimum pH for the dissolution heat-induced whey gels in alkaline solutions has been studied using β-lactoglobulin (βLg) as model protein. A sharp transition solubility was observed between 11 and 12; this shifts to higher pHs formed at temperatures longer gelling times. breakdown reactions aggregates alkali were monitored with size exclusion chromatography. destruction large faster also showed 12. Using tryptophan fluorescence near- far-UV circular dichroism,...

An experimental and theoretical methodology is proposed to calculate the permeability of microcapsules that contain a core oil-based active ingredient. Theoretical analysis performed considering polydispersity measurable capsule size, which allows estimation via three different methods. The models were applied in order determine melamine-formaldehyde with hexyl salicylate as oil. Release experiments four co-solvents (ethanol, propan-1-ol, propan-2-ol 1,3-butanediol) concentration....

The dissolution of heat-induced β-lactoglobulin (βLg) gels in alkaline solution plays an important role the cleaning-in-place fouled dairy and other food plants. behavior is strongly influenced by conditions under which gel formed. At low pH values (<13), rate constant kg' decreases with longer gelation time higher temperature. An inverse relationship observed between value amount covalently cross-linked proteins gel, mainly due to disulfide bonds. β-Elimination kinetics intramolecular...

The cold gelation of preheated whey protein isolate (WPI) solutions at alkaline conditions (pH>10) has been studied to better understand the effect NaOH in formation and destruction aggregates gels. Oscillatory rheology used follow process, resulting novel different profiles with pH. At low pH, typical sol-gel transitions are observed, as many other biopolymers. pH>11.5, system gels quickly, after approximately 300 s, followed by a slow degelation step that transforms gel viscous solution....

Perfume microcapsules for laundry applications are extensively used in home and consumer care products. Capsules have to bind into the fabric during washing survive rinsing drying steps until desired moment of rupture, usually when contact with skin. In order assess performance different steps, quantification methods required. It is reported here first methodology, using fluorescence microscopy, whereby number size fluorescent individually determined large areas image analysis. The...