Association between Protein Particles and Long Amphiphilic Polymers:  Effect of the Polymer Hydrophobicity on Binding Isotherms

1999 ◽  
Vol 32 (12) ◽  
pp. 3922-3929 ◽  
Author(s):  
Iolanda Porcar ◽  
Hervé Cottet ◽  
Pierre Gareil ◽  
Christophe Tribet
Keyword(s):  
Amphiphilic Polymers ◽  
Binding Isotherms ◽  
Protein Particles

Formation of Complexes between Protein Particles and Long Amphiphilic Polymers:  Binding Isotherms versus Size and Surface of the Particles

1998 ◽  
Vol 102 (40) ◽  
pp. 7906-7909 ◽  
Author(s):  
Iolanda Porcar ◽  
Pierre Gareil ◽  
Christophe Tribet
Keyword(s):  
Amphiphilic Polymers ◽  
Binding Isotherms ◽  
Protein Particles ◽  
Formation Of Complexes

Enthalpy of Interaction and Binding Isotherms of Non-ionic Surfactants onto Micellar Amphiphilic Polymers (Amphipols)

Langmuir ◽  
2007 ◽  
Vol 23 (6) ◽  
pp. 3025-3035 ◽  
Author(s):  
C. Diab ◽  
F. M. Winnik ◽  
C. Tribet
Keyword(s):  
Amphiphilic Polymers ◽  
Ionic Surfactants ◽  
Enthalpy Of Interaction ◽  
Binding Isotherms

Effect of Two-step Heat Treatment Processes on the Formation of Protein Particles and Oil Droplets in Soymilk

2020 ◽  
Vol 26 (3) ◽  
pp. 445-450
Author(s):  
Makoto Shimoyamada ◽  
Hironori Shikano ◽  
Shingo Mogami ◽  
Makoto Kanauchi ◽  
Hayato Masuda ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Oil Droplets ◽  
Treatment Processes ◽  
Protein Particles ◽  
Step Heat Treatment

scholarly journals Effect of Molecular Architecture on Associating Behavior of Star-Like Amphiphilic Polymers Consisting of Plural Poly(ethylene oxide) and One Alkyl Chain

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 460
Author(s):  
Daisuke Kugimoto ◽  
Aoi Taniguchi ◽  
Masaki Kinoshita ◽  
Isamu Akiba
Keyword(s):  
Ethylene Oxide ◽  
Average Molecular Weight ◽  
Amphiphilic Polymers ◽  
Hydrophobic Core ◽  
Molecular Architecture ◽  
Polymer Micelles ◽  
The Core ◽  
X Ray Scattering ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Associating behavior of star-like amphiphilic polymers consisting of two or three poly(ethylene oxide) (PEO) chains and one stearyl chain (C18) was investigated. Although the aggregation number (Nagg) of linear analogue of amphiphilic polymers monotonically decreased with increasing number-average molecular weight of PEO (Mn,PEO), the Nagg of micelles of star-like amphiphilic polymers with Mn,PEO = 550 g/mol was smaller than that with Mn,PEO = 750 g/mol, whereas that with Mn,PEO ≥ 750 g/mol showed general Mn,PEO dependence. Small-angle X-ray scattering analyses revealed that the occupied area of one PEO chain on the interface between hydrophobic core and corona layer in the micelles of star-like polymers was much narrower than that in the linear amphiphilic polymers. This result indica ted the PEO chains of star-like polymers partially took unfavorable conformation near the core–corona interface in polymer micelles. The effect of local conformation of PEO chains near the interface on the associating behavior became significant as Mn,PEO decreased. Therefore, in polymer micelles of star-like amphiphilic polymers containing PEO with Mn,PEO = 550 g/mol, the enlargement of occupied area of PEO on the core–corona interface should be caused to avoid the formation of unfavorable conformations of partial PEO chains, resulting in a decrease in Naggs.

scholarly journals Fluctuating Diffusivity of RNA-Protein Particles: Analogy with Thermodynamics

Entropy ◽  
2021 ◽  
Vol 23 (3) ◽  
pp. 333
Author(s):  
Yuichi Itto
Keyword(s):  
Internal Energy ◽  
Messenger Rna ◽  
Living Cells ◽  
Statistical Fluctuation ◽  
Rna Molecules ◽  
Average Value ◽  
Thermodynamic Entropy ◽  
Laws Of Thermodynamics ◽  
Protein Particles ◽  
Quantity Of Heat

A formal analogy of fluctuating diffusivity to thermodynamics is discussed for messenger RNA molecules fluorescently fused to a protein in living cells. Regarding the average value of the fluctuating diffusivity of such RNA-protein particles as the analog of the internal energy, the analogs of the quantity of heat and work are identified. The Clausius-like inequality is shown to hold for the entropy associated with diffusivity fluctuations, which plays a role analogous to the thermodynamic entropy, and the analog of the quantity of heat. The change of the statistical fluctuation distribution is also examined from a geometric perspective. The present discussions may contribute to a deeper understanding of the fluctuating diffusivity in view of the laws of thermodynamics.

Fish oil encapsulated in soy protein particles by lyophilization. Effect of drying process

2021 ◽  
Author(s):  
Luciana Di Giorgio ◽  
Pablo Rodrigo Salgado ◽  
Adriana Noemi Mauri
Keyword(s):  
Fish Oil ◽  
Soy Protein ◽  
Drying Process ◽  
Protein Particles

The Appearance Of PF1 And PF3 In Activated Human Platelets

1981 ◽  
Author(s):  
H Sandberg ◽  
A P Bodet ◽  
F A Dombrosei ◽  
L O Andersson ◽  
B R Lentz
Keyword(s):  
Human Platelets ◽  
Dense Granule ◽  
Void Volume ◽  
Factor V ◽  
Dense Granules ◽  
Protein Particles ◽  
Hydrolysis Of ◽  
Platelet Pellet ◽  
Stimulation Of

Collagen and thrombin induced platelet activation were examined, in vitro, with regard to the appearance of surface-associated Factor V-like activity (PF1) and catalytic phospholipid-like surface activity (PF3). Two test systems were used: a clotting assay (a modified KAPTT) and a chromogenic substrate assay (maximum hydrolysis of S-2238). Following stimulation of normal platelets, both PF1 and PF3 appeared simultaneously in the supernatant and platelet pellet. When normal platelets were collected and carefully washed in a buffer containing adenosine, PGE1, and theophylline, the appearance of both PF1 and PF3 was blocked, as was the release of ATP from dense granules, the release of β-TG and PF4 from α-granules, and the occurrence of aggregation. When platelets were collected in this same inhibitor-containing buffer, and then gel filtered/centrifuge-washed in an inhibitor-free buffer, the appearance of PF1 and PF3 was still blocked. This occurred even though release of ATP, β-TG and PF4 as well as aggregation followed a pattern equivalent to platelets never exposed to these inhibitors. When the release supernatant from normal platelets isolated in the absence of inhibitors was gel filtered on Sepharose CL-4B in the presence of EDTA, the carbohydrate-free, lipid- protein particles (70-170nm diam.) that provide PF3 appeared in the void volume. When the release supernatant from normal platelets was gel filtered in the presence of Ca2+, both, PF1 and PF3 eluted in the void volume. With platelets isolated from severe F.V-deficient donors, only PF3 was found in the void volume, in the presence or absence of Ca2+. It seems that the appearance of PF1 and PF3 as coagulant activities is completely separate from both the release of dense granule and α-granule contents as well as platelet aggregation and that the appearance of PF1 requires the presence of Ca2+.

Model mixtures evidence the respective roles of whey protein particles and casein micelles during acid gelation

2014 ◽  
Vol 37 ◽  
pp. 203-212 ◽  
Author(s):  
Robi Andoyo ◽  
Fanny Guyomarc'h ◽  
Chantal Cauty ◽  
Marie-Hélène Famelart
Keyword(s):  
Whey Protein ◽  
Casein Micelles ◽  
Protein Particles ◽  
Acid Gelation
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