Rheological properties of whey protein/gum arabic coacervates

Weinbreck, Fanny; Wientjes, R.H.W.; Nieuwenhuijse, Hans; Robijn, Gerard W.; Kruif, C. G. de

doi:10.1122/1.1795191

Cited by 141 publications

(87 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This type of mechanical characterization can give insight into the molecular-level interactions present in the material, and is critical to enable effective processing of these materials. Generally, coacervates have been reported to have a Newtonian, or a shear-rate independent viscosity [71,111,171,172], as well as a shear thinning response [2,87,111,124,[171][172][173][174][175], depending on the shear rate. The occurrence of shear thinning is suggestive of a structural change in the material, and research has suggested that the tendency for shear thinning in coacervate-based materials may correlate with the strength of the underlying electrostatic interactions [2,174].…”

Section: Viscositymentioning

confidence: 99%

“…Another interesting material property conferred by the non-covalent nature of the molecular interactions defining complex coacervates is the potential for self-healing and structural recovery after complete network disruption [174,178]. This can be assayed by the application of a large strain (i.e., 100% oscillatory shear strain, well beyond the linear range for the material) to break the sample, followed by continuous measurements back in the linear strain regime to track the ability of the material to recover its original elasticity, and the requisite timescale to do so.…”

Section: Self-healing and Structural Recoverymentioning

confidence: 99%

See 1 more Smart Citation

Linear viscoelasticity of complex coacervates

Liu

Winter

Perry

2017

Advances in Colloid and Interface Science

128

163

View full text Add to dashboard Cite

Rheology is a powerful method for materials characterization that can provide detailed information about the self-assembly, structure, and intermolecular interactions present in a material. Here, we review the use of linear viscoelastic measurements for the rheological characterization of complex coacervate-based materials. Complex coacervation is an electrostatically and entropically-driven associative liquid-liquid phase separation phenomenon that can result in the formation of bulk liquid phases, or the self-assembly of hierarchical, microphase separated materials. We discuss the need to link thermodynamic studies of coacervation phase behavior with characterization of material dynamics, and provide parallel examples of how parameters such as charge stoichiometry, ionic strength, and polymer chain length impact self-assembly and material dynamics. We conclude by highlighting key areas of need in the field, and specifically call for the development of a mechanistic understanding of how molecular-level interactions in complex coacervate-based materials affect both selfassembly and material dynamics.

show abstract

Section: Viscositymentioning

confidence: 99%

Section: Self-healing and Structural Recoverymentioning

confidence: 99%

Linear viscoelasticity of complex coacervates

Liu

Winter

Perry

2017

Advances in Colloid and Interface Science

128

163

View full text Add to dashboard Cite

show abstract

“…It also often involves a variety of biopolymers derived from natural gums, proteins, modified starches, and their blends (Sheu & Rosenberg 1998;Adhikari et al 2003;Muthukumarasamy et al 2006). These biopolymers serve as wall materials with desirable properties such as a good solubility, but they differ in interfacial functionality and rheological properties (Fortuna et al 2004;Weinbreck & Wientjes 2004;Norziah et al 2006). Their flexibility or rigidity also play an important role in their structure-function relationship and in commercial applications in the food and biomedical industries (Morrisa et al 2008).…”

mentioning

confidence: 99%

The effects of rheological properties of wall materials on morphology and particle size distribution of microcapsule

Xie¹,

WANg²,

Lu³

et al. 2010

Czech J. Food Sci.

View full text Add to dashboard Cite

Xie Y., Wang A., Lu Q., Hui M. (2010): The effects of rheological properties of wall materials on morphology and particle size distribution of microcapsule. Czech J. Food Sci., 28: 433-439.The effects of rheological properties of the wall materials on the morphology and particle size distribution of microcapsules prepared by spray-drying were evaluated. Gelatin-sucrose (Gel-Suc), gelatin-peach-gum-sucrose (Gel-PG-Suc), and HI-CAP 100 were used as wall materials with vitamin A as a model core material. Scanning electron microscopy (SEM) showed that microcapsules produced with Gel-Suc exhibited cracks while Gel-PG-Suc produced a smooth surface with few pores, and HI-CAP100 a rounded surface containing characteristic concavities. The volume average diameter (D 4,3 ) showed significant variations from 73.9 ± 1.02 µm and 68.7 ± 0.85 µm to 29.9 ± 0.94 µm (P < 0.05). Rheometry indicated that the wall paste viscosity was inversely proportional to the shear rate. Viscosity ranking was Gel-Suc > Gel-PG-Suc > HI-CAP 100. Gel-Suc showed the highest elastic modulus (G') and viscous modulus (G'' values), followed by Gel-PG-Suc and HI-CAP 100. Gel-Suc was associated with moderate quantities of broken microcapsules while HI-CAP 100 generated numerous microcapsules with characteristic dents generated during spray-drying.

show abstract

“…In contrast during coacervation, the charge neutralization of complexes was achieved through lowering of acacia gum negative charges [8]. Weinbreck et al [9,10,64,65,94] have studied the complex coacervation phenomenon in whey protein and gum arabic solutions and examined the composition and structure of the coacervate phase. The rheological studies revealed the viscous nature of their complex coacervate where G'' dominated over G' .…”

Section: Resultsmentioning

confidence: 99%

“…The "retention maps" for the pH dependences of IEC capacity factors were quite revealing as this established the existence of patch binding without doubt. This was attributed to the heterogeneous charge distribution on the protein surface that facilitated binding though the net charge on protein may be of the same kind as that of the absorbent [65,66].…”

Section: Surface Patch Bindingmentioning

confidence: 99%

Coacervation in Biopolymers

Rawat¹

2014

J Phys Chem Biophys

View full text Add to dashboard Cite

Polyelectrolyte charge; Ionic strength; Surface patch binding; Viscoelastic behavior and internal structure IntroductionCoacervation: Coacervation is a thermodynamic transition which allows a homogeneous solution of charged macroions to undergo liquidliquid phase separation, giving rise to a polymer-rich dense phase coexisting with its supernatant. These two liquid phases are immiscible but are thermodynamically compatible. The polymer-rich dense phase is often called the coacervate. Structurally it lies between the crystalline and liquid phases. Thus, it can bear intermediate range structural order and can be referred to as a mesophase. Coacervation has been mostly studied in aqueous solutions of charged synthetic or biological macromolecules in the past. In particular, protein-polysaccharide and protein-protein coacervates have attracted much attention because of their inherent potential in generating new biomaterials. In addition, such studies provide basic understanding of specific and non-specific interactions operating between complementary polyelectrolytes [1-6] or polyelectrolyte-polyampholyte [7][8][9][10][11][12][13][14][15] pairs. Normally, polysaccharides are strong polyelectrolytes whereas proteins, in addition, can be polyampholytes. Hence, the association problem reduces to that of the general study of interaction between polyelectrolyte (PE) and polyampholyte (PA) molecules [6,16]. A recent review encapsulates many of the anomalous as well as the salient features of protein-polyelectrolyte interactions [1] The phenomenon of protein based coacervates, formed of strong electrostatic interactions, has been reported for β-lactoglobulin-gum Arabic [7,8] [17]. The diversity of material properties associated with coacervates can be gauged from the fact that β-lactoglobulin-gum arabic coacervates were found to be associated with vescicular to sponge-like internal structure whereas whey protein-gum arabic coacervate was observed to be a highly concentrated (melt-like) phase. In contrast, *Corresponding author: Kamla Rawat, Special Center for Nanosciences, Jawaharlal Nehru University, New Delhi 110067, India, Tel: +91 11 2670 4699; Fax: +91 11 2674 1837; E-mail: kamla.jnu@gmail.com β-lactoglobulin-pectin coacervates were found to be a heterogeneous phase comprising of pectin networks with protein domains forming the junction points [17]. It has been shown that a polyelectrolyte, DNA and a polyampholyte, gelatin can undergo associative interaction and form complex coacervates with interesting thermal properties [15]. Further, it has been realized that in a class of systems coacervation transition is governed by surface selective patch binding even though both the polyions carry similar net charge [11,18,19]. In particular, in SPB interactions complementary polyions (normally a PA-PE pair) seek oppositely charged patches to bind overcoming the repulsion occurring between similarly charged surface patches. This is often referred to as binding on the wrong side of pH.The following provides a brief structural i...

show abstract

Rheological properties of whey protein/gum arabic coacervates

Cited by 141 publications

References 23 publications

Linear viscoelasticity of complex coacervates

Linear viscoelasticity of complex coacervates

The effects of rheological properties of wall materials on morphology and particle size distribution of microcapsule

Coacervation in Biopolymers

Contact Info

Product

Resources

About