scholarly journals Controlled release of a model hydrophilic high molecular weight compound from injectable non-lamellar liquid crystal formulations containing different types of phospholipids

2020 ◽  
Vol 577 ◽  
pp. 118944 ◽  
Author(s):  
Akie Okada ◽  
Hiroaki Todo ◽  
Ichiro Hijikuro ◽  
Shoko Itakura ◽  
Kenji Sugibayashi
Keyword(s):  
Molecular Weight ◽  
Liquid Crystal ◽  
Controlled Release ◽  
High Molecular Weight ◽  
Lamellar Liquid Crystal ◽  
High Molecular Weight Compound ◽  
Different Types

scholarly journals In Vitro Antioxidant Activity and FTIR Characterization of High-Molecular Weight Melanoidin Fractions from Different Types of Cocoa Beans

Antioxidants ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 560 ◽  
Author(s):  
Oracz ◽  
Zyzelewicz
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Antioxidant Properties ◽  
Model Systems ◽  
Total Phenolic ◽  
Cocoa Beans ◽  
Potential Health ◽  
Antioxidant Power ◽  
Different Types

Melanoidins from real foods and model systems have received considerable interest due to potential health benefits. However, due to the complexity of these compounds, to date, the exact structure of melanoidins and mechanism involved in their biological activity has not been fully elucidated. Thus, the aim of this study was to investigate the total phenolic content, antioxidant properties, and structural characteristics of high-molecular weight (HMW) melanoidin fractions isolated by dialysis (>12.4 kDa) from raw and roasted cocoa beans of Criollo, Forastero, and Trinitario beans cultivated in various area. In vitro antioxidant properties of all studied HMW cocoa fractions were evaluated by four different assays, namely free radical scavenging activity against DPPH● and ABTS●+ radicals, ferric reducing antioxidant power (FRAP), and metal-chelating ability. Additionally, the structure–activity relationship of isolated HMW melanoidin fractions were analyzed using attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR). The results show that roasting at a temperature of 150 °C and a relative air humidity of 0.3% effectively enhances the total phenolics content and the antioxidant potential of almost all HMW cocoa melanoidin fractions. The ATR-FTIR analysis revealed that the various mechanisms of action of HMW melanoidins isolates of different types of cocoa beans related to their structural diversity. Consequently, the results clearly demonstrated that HMW cocoa fractions isolated from cocoa beans (especially those of Criollo variety) roasted at higher temperatures with the lower relative humidity of air possess high antioxidant properties in vitro.

scholarly journals Cutinase-Like Enzyme from the Yeast Cryptococcus sp. Strain S-2 Hydrolyzes Polylactic Acid and Other Biodegradable Plastics

2005 ◽  
Vol 71 (11) ◽  
pp. 7548-7550 ◽  
Author(s):  
Kazuo Masaki ◽  
Numbi Ramudu Kamini ◽  
Hiroko Ikeda ◽  
Haruyuki Iefuji
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Polylactic Acid ◽  
Biodegradable Plastics ◽  
Remote Homology ◽  
High Molecular Weight Compound ◽  
Polybutylene Succinate

ABSTRACT A purified lipase from the yeast Cryptococcus sp. strain S-2 exhibited remote homology to proteins belonging to the cutinase family rather than to lipases. This enzyme could effectively degrade the high-molecular-weight compound polylactic acid, as well as other biodegradable plastics, including polybutylene succinate, poly (ε-caprolactone), and poly(3-hydroxybutyrate).

scholarly journals Investigation of inverse emulsion assisted controlled release of polyacrylamides for enhanced oil recovery

RSC Advances ◽  
2019 ◽  
Vol 9 (21) ◽  
pp. 11968-11977 ◽  
Author(s):  
Zheyu Liu ◽  
Shruti Mendiratta ◽  
Xin Chen ◽  
Jian Zhang ◽  
Yiqiang Li
Keyword(s):  
Molecular Weight ◽  
Controlled Release ◽  
High Molecular Weight ◽  
Aging Time ◽  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
High Viscosity ◽  
Oil Emulsion ◽  
Inverse Emulsion ◽  
Water In Oil Emulsion

A high-molecular-weight polyacrylamide-based polymer encapsulated in water-in-oil emulsion is proposed for enhanced oil recovery. Its high viscosity, viscoelasticity and plugging capacity with aging time are beneficial for oil mobilization.

Synthesis of high-molecular weight liquid crystal polyesters based on a polycondensation mesogenic monomer

1984 ◽  
Vol 26 (12) ◽  
pp. 2882-2890 ◽  
Author(s):  
A.Yu. Bilibin ◽  
A.V. Ten'kovtsev ◽  
O.N. Piraner ◽  
S.S. Skorokhodov
Keyword(s):  
Molecular Weight ◽  
Liquid Crystal ◽  
High Molecular Weight

SOME FACTORS AFFECTING THE KÖNIGS–KNORR SYNTHESIS OF GLYCOSIDES

1961 ◽  
Vol 39 (10) ◽  
pp. 2025-2034 ◽  
Author(s):  
H. R. Goldschmid ◽  
A. S. Perlin
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Silver Oxide ◽  
Condensation Reaction ◽  
Side Reaction ◽  
Ortho Ester ◽  
Factors Affecting ◽  
High Molecular Weight Compound ◽  
Elemental Iodine

Glycosyl halides decompose readily in the presence of silver oxide under conditions generally used for the Königs–Knorr synthesis of glycosides. This "side reaction" probably accounts for the low yields commonly obtained in the synthesis of oligosaccharides, particularly those involving the formation of a glycosidic union through an unreactive secondary position. The rate of the side reaction, as well as that of the normal condensation reaction, is dependent on the condition of the silver oxide, and is retarded markedly by elemental iodine. This latter effect appears to be related to the improved yield obtained in Königs–Knorr syntheses when iodine is used. Among the products formed in the decomposition of 2,3,4,6-tetra-O-acetyl-α-D-mannopyranosyl bromide are 2,3,4,6-tetra-O-acetyl-D-mannose, a heptaacetyl 1,2,1′-linked dimeric orthoacetate, and a second high-molecular-weight compound that also shows ortho ester properties.

Photo-induced bending behaviour of side-on linear liquid crystal polymers with high molecular weight

2019 ◽  
Vol 47 (8) ◽  
pp. 1154-1161 ◽  
Author(s):  
Huan Li ◽  
Quan Liu ◽  
Chongyu Zhu ◽  
Jia Wei ◽  
Yanlei Yu
Keyword(s):  
Molecular Weight ◽  
Liquid Crystal ◽  
High Molecular Weight ◽  
Liquid Crystal Polymers ◽  
Bending Behaviour
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