Whey proteins solubility as function of temperature and pH

Pelegrine, Daniela Helena Guimarães; Gasparetto, Carlos Alberto

doi:10.1016/j.lwt.2004.03.013

Cited by 279 publications

(183 citation statements)

References 9 publications

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“…The increase in the solubility might be attributed to conformational and structural changes so that hydrophilic amino acids residues are reoriented towards the water. Generally, higher solubility implies better emulsion, gelation, and foaming properties [57]. It has been reported that sonication could favor the enlargement of soluble protein aggregates from insoluble precipitates [58].…”

Section: Effect Of Ultrasound Pretreatment On Solubility Of Rapeseed mentioning

confidence: 99%

Impact of Power Ultrasound on Antihypertensive Activity, Functional Properties, and Thermal Stability of Rapeseed Protein Hydrolysates

Wali

Shahnawaz

et al. 2017

Journal of Chemistry

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The effects of power ultrasound pretreatments on the degree of hydrolysis (DH), angiotensin-I-converting enzyme (ACE) inhibitory activity, amino acid composition, surface hydrophobicity, protein solubility, and thermal stability of ACE inhibition of rapeseed protein hydrolysates were evaluated. Ultrasonic pretreatments before enzymolysis in terms of power and exposure time increased the DH and ACE inhibitory activities over the control (without sonication). In this study, maximum DH 22.07% and ACE inhibitory activity 72.13% were achieved at 600 W and 12 min pretreatment. Compared to the hydrolysates obtained without sonication, the amino acid profile of ultrasound pretreated hydrolysates showed significant changes particularly in the proline content and hydrophobic amino acids with an increased rate of 2.47% and 6.31%, respectively. Ultrasound pretreatment (600 watts, 12 min) improved functional properties of protein hydrolysates over control by enhancing surface hydrophobicity and solubility index with an increased rate of 130.76% and 34.22%. Moreover, the stability test showed that the ACE inhibitory activity remains stable against heat treatments. However, extensive heat, prolonged heating time, and alkaline conditions were not in the favor of stability test, while under mild heat and acidic conditions their ACE inhibitory activities were not significantly different from unheated samples.

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Section: Effect Of Ultrasound Pretreatment On Solubility Of Rapeseed mentioning

confidence: 99%

Impact of Power Ultrasound on Antihypertensive Activity, Functional Properties, and Thermal Stability of Rapeseed Protein Hydrolysates

Wali

Shahnawaz

et al. 2017

Journal of Chemistry

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“…Proteins are denatured due to the effect of temperature on the non-covalent bonds involved in the stabilization of secondary and tertiary structure. Denaturation decreases protein solubility compared to the native protein [35].…”

Section: Effect Of Cleaning Solution Temperaturementioning

confidence: 99%

Cleaning of ultrafiltration membranes fouled with BSA by means of saline solutions

Corbatón-Báguena

Álvarez-Blanco

Vincent‐Vela

2014

Separation and Purification Technology

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Accepted ManuscriptThis is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractIn this work, four ultrafiltration (UF) membranes with molecular weight cut-offs (MWCOs) of 5, 15, 30 and 50 kDa, respectively, were fouled with 1 % BSA aqueous solutions and cleaned with different saline solutions. The influence of MWCO, membrane material and operating conditions on the cleaning efficiency was investigated. Saline solutions were able to clean the 5, 15 and 30 kDa membranes, but not the 50 kDa membrane. NaCl, NaNO 3 , NH 4 Cl and KCl were the most effective salts. The cleaning tests demonstrated that the higher the temperature of the saline solution was, the higher the cleaning efficiency was also. In addition, an increase in the crossflow velocity resulted in an increase in the hydraulic cleaning efficiency (HCE). However, there was an optimum value of salt concentration to clean the membrane effectively. Response Surface 2 Methodology was used to investigate the relationship between salt concentration and temperature in the cleaning process.

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“…On the other hand, polymer brushes with amine or imine groups, for example poly(2-(dimethylaminoethyl) methacrylate) PDMA [150] or poly(vinyl pyridine) [144,151] respectively, aggregate at high pH values. Interestingly, proteins are another interesting class of pH responsive coatings, due to their pH-dependent U-shape solubility behavior with a minimum at the isoelectric point (pI) [152] . Proteins are natural co-polymers made of polar, nonpolar, and ionic monomers (in total 21 aminoacids, including selenocysteine), and depending on the primary structure of the proteins, they can exhibit dissimilar sensitivity toward pH and different pI.…”

Section: Polymer Brushesmentioning

confidence: 99%

Coating matters: the influence of coating materials on the optical properties of gold nanoparticles

Chanana¹,

Liz‐Marzán²

2012

Nanophotonics

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An essential element in the synthesis of nanomaterials based on gold nanoparticles comprises the control over parameters such as size, shape and composition, due to their strong infl uence on the properties of the particles. However, it is the coating material which often plays the primary role in tuning the size, morphology, and even plasmon resonance wavelength or mode multiplicity, as well as colloidal stability and functional versatility, ultimately determining the physical, chemical, optical, electronic and catalytic properties of the nanoparticles. Therefore, it is utterly important to select the adequate wet chemistry synthetic approach with the most suitable coating material for the preparation of gold nanoparticles with the desired requirements. Within this context, this review is focused on describing various types of organic and inorganic coating materials for gold nanoparticles that may notably affect their optical properties by either directly infl uencing the synthesis procedure or by changing their chemical and physical properties upon post-synthetic modifi cations, such that they exhibit novel and useful optical properties.

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Whey proteins solubility as function of temperature and pH

Cited by 279 publications

References 9 publications

Impact of Power Ultrasound on Antihypertensive Activity, Functional Properties, and Thermal Stability of Rapeseed Protein Hydrolysates

Impact of Power Ultrasound on Antihypertensive Activity, Functional Properties, and Thermal Stability of Rapeseed Protein Hydrolysates

Cleaning of ultrafiltration membranes fouled with BSA by means of saline solutions

Coating matters: the influence of coating materials on the optical properties of gold nanoparticles

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