دانلود رایگان مقاله لاتین محیط زیست ناشی از رفتار خود تجمعی از سایت الزویر
عنوان فارسی مقاله:
محیط زیست ناشی از رفتار خود تجمعی κ-کاراگینان / لیزوزیم پیچیده
عنوان انگلیسی مقاله:
Environment induced self-aggregation behavior of κ-carrageenan/lysozyme complex
سال انتشار : 2015
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مقدمه انگلیسی مقاله:
1. Introduction
Polyelectrolyte complexes, preparing by mixing solutions of oppositely charged polyelectrolytes, have has been found for many years (Laneuville, Turgeon, Sanchez, & Paquin, 2006; Thünemann, Müller, Dautzenberg, Joanny, & Löwen, 2004). Protein and polysaccharide, two common natural polyelectrolyte, are known to have complicated interactions and hard to control (Evans, Ratcliffe, & Williams, 2013; Luo & Wang, 2014). Their complexation is always the active field of research in the past decade because their simultaneous use commonly occurs in food products. And their interactions play a significant role in regulating the structure, texture, and stability of food systems (Doublier, Garnier, Renard, & Sanchez, 2000; Schmitt & Turgeon, 2011; Tran & Rousseau, 2013). The protein/polysaccharide complexes have been widely used as friendly vehicle to control release of proteins and drugs (Liu et al., 2013; Salmaso & Caliceti, 2013), to encapsulate bioactive and other compounds (Yang, Wu, Li, Zhou, & Wang, 2013), and to fabricate structured organization (Gosal & Ross-Murphy, 2000). However, the instability of complexes formed by oppositely charged protein and polysaccharide is an inevitable problem. Electrostatic interaction is the prevalent primary interaction controlling the complexation of proteins/polysaccharides, which can also be affected by many extrinsic factors, such as ionic strength, pH, protein/polysaccharide ratio and thermal treatment (Li et al., 2012; Schmitt & Turgeon, 2011). Any external disturbances may induce phase transition. Therefore, there is a need to understand the self-aggregation behavior induced by environmental conditions for better controlling this transition. Although many complex systems have been widely studied that mainly focused on the milk protein, vegetable proteins, cereal protein, egg protein and other protein with anionic or cationic polysaccharides (Hosseini et al., 2013; Lacroix & Li-Chan, 2014; Teng, Luo, & Wang, 2013; Luo, Zhang, Whent, Yu, & Wang, 2011). The intrinsic factors of each proteins/polysaccharides system, such as molecular weight and charge density, determined that each associative behavior was different with other systems (Schmitt & Turgeon, 2011). Both the two biopolymers of lysozyme and κ-carrageenan are extensively used in food and medicinal application. CRG is a kind of sulfated linear polysaccharide extracted from red seaweed, andconstitute of galactose and anhydrogalactose units which are linked by glycosidic bonds (Rodrigues, da Costa, & Grenha, 2012). CRG is a kind of bioactive polysaccharides and dietary fiber with strong ionic properties for half-ester sulfate group, and therefore has a high capacity to interact with proteins. Ly, the main protein component of the egg white fraction, has a molar mass of 14.3 kDa and been received attentions for its use as a kind of food preservative (Schuh, Schwarzenbolz, & Henle, 2010). As our group reported before the two biopolymers with opposite charges could easily self-assemble into soluble complex in neutral condition (Xu et al., 2014), But the self-aggregation behavior of the system induced by environment has also not been reported. Therefore, in the present work, we investigated self-aggregation behavior of CRG/Ly complex induced by intrinsic and extrinsic factors, including initial CRG/Ly ratio, pH, ionic strength and heat treatment. The transmittance, size, ζ-potential, micro-structure scanning electron microscope (SEM) and transmission electron microscopy (TEM) were used to monitor the association from optical images and micro structure. The purpose of this study was to evaluate the effects of pH, NaCl concentrations, the CRG/Ly ratios and thermal treatment on the self-aggregation behavior and the environmental tolerance of the complexes.
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کلمات کلیدی:
Food Proteins and Peptides: Chemistry, Functionality, Interactions, ... https://books.google.com/books?isbn=142009341X Navam S. Hettiarachchy, Kenji Sato, Maurice R. Marshall - 2012 - Technology & Engineering The opposite behavior was observed when the addition of the native WPs ... with κ-CN via a sulfydryl interchange together with hydrophobic interactions ... CN micelles, they can form self-aggregates mainly linked by disulfide bonds, ... Nativewhey protein Casein micelles (a) (b) Whey protein aggregate Whey Heat-Induced ... Colloidal Crystals of Spheres and Cubes in Real and Reciprocal Space https://books.google.com/books?isbn=3319148095 Janne-Mieke Meijer - 2015 - Science Clearly, aggregation of the cubes occurred as expected by the decrease of the ... to the aggregation of the cubes into disordered clusters due to the short κ−1 and the ... That conditions at low pH and no added salt allow self-assembly of the cubes ... The obtained layered crystal structure is induced by the cube shape—flat ... Milk Proteins: From Expression to Food https://books.google.com/books?isbn=0080920683 Abby Thompson, Mike Boland, Harjinder Singh - 2009 - Technology & Engineering With increasing protein concentration, caseins aggregate to form various ... its competitive ability because of its self-aggregation to form micelles or through the ... These changes will inevitably influence the adsorption behavior of milk ... 0 1 2 3 4 5 Concentration of protein (%) n stokes 2 9 212r()ρρ η (11.1) Heat-induced ... Functional Food Carbohydrates - Page 109 - Google Books Result https://books.google.com/books?isbn=1420003518 Costas G. Biliaderis, Marta S. Izydorczyk - 2006 - Technology & Engineering The effect of the degree of acetylation (DA) on the gelation behaviors upon ... that the deacetylation leads to the aggregation of stiffened molecular chains. ... not seem to occur as in cold-set gels, such as gellan gels and κ-carrageenan gels. ... in self-supporting gels of gellan induced by temperature change,24 also occurs in ... crg | Sigma-Aldrich www.sigmaaldrich.com/catalog/search?interface=All&term=crg... Self-aggregation behaviors of κ-carrageenan/lysozyme (CRG/Ly) complex inducing by intrinsic and extrinsic factors were investigated form macro and micro ...
