Synthesis and properties of maleic anhydride-modified agar with reversibly controlled gel strength

2022 ◽  
Author(s):  
Siying Ye ◽  
Yonghui Zhang ◽  
Jun Chen ◽  
Fuquan Chen ◽  
Huifen Weng ◽  
...  
Keyword(s):  
Maleic Anhydride ◽  
Gel Strength

Reactions of macroions with ester and carboxylic groups of polymers

1987 ◽  
Vol 52 (9) ◽  
pp. 2194-2203
Author(s):  
Miloslav Kučera ◽  
Dušan Kimmer ◽  
Karla Majerová ◽  
Josef Majer
Keyword(s):  
Maleic Anhydride ◽  
Acrylic Acid ◽  
Methyl Methacrylate ◽  
Bond Formation ◽  
Covalent Bond ◽  
The Other ◽  
Poly Methyl Methacrylate ◽  
Other Hand ◽  
Carboxylic Groups ◽  
Poly Acrylic Acid

In the reaction of dianions with poly(methyl methacrylate), only an insignificant amount of insoluble crosslinked product is obtained. If, however, the concentration of grafting dianions approaches that of ester groups, the amount of poly(methyl methacrylate) which may thus be crosslinked becomes quite significant. Dications, too, can bring about crosslinking of only an insignificant number of poly(methyl methacrylate) chains. Carboxylic groups in poly(acrylic acid) react with dianions and dications in an anhydrous medium similarly to ester groups. On the other hand, in the presence of a cocatalytic amount of water dications are more readily bound to carboxylic groups, forming a covalent bond. The relatively highest efficiency was observed in the bond formation between dication and the poly[styrene-alt-(maleic anhydride)], both in an anhydrous medium and in the presence of H2O.

Properties of Biobased Epoxy Resins from Epoxidized Soybean Oil (ESBO) Cured with Maleic Anhydride (MA)

2012 ◽  
Vol 89 (11) ◽  
pp. 2067-2075 ◽  
Author(s):  
J. M. España ◽  
L. Sánchez-Nacher ◽  
T. Boronat ◽  
V. Fombuena ◽  
R. Balart
Keyword(s):  
Maleic Anhydride ◽  
Soybean Oil ◽  
Epoxy Resins ◽  
Epoxidized Soybean Oil

Synthesis and ethylene-promoted metathesis of adducts of tandem [4+2]/[4+2] cycloaddition between bis-furyl dienes and maleic acid derivatives

2021 ◽  
Vol 45 (7) ◽  
pp. 3400-3407
Author(s):  
Elizaveta A. Kvyatkovskaya ◽  
Polina P. Epifanova ◽  
Eugeniya V. Nikitina ◽  
Aleksey A. Senin ◽  
Victor N. Khrustalev ◽  
...  
Keyword(s):  
Maleic Anhydride ◽  
Maleic Acid

A series of 1,4:5,8-diepoxynaphthalenes, annellated with carbo- and heterocycles, was synthesized based on the tandem intermolecular/intramolecular [4+2] cycloaddition of bis-furyl dienes with moderately to highly reactive cyclic dienophiles (maleic anhydride and maleinimides).

scholarly journals Cytotoxicity, Oxidative Stress, Cell Cycle Arrest, and Mitochondrial Apoptosis after Combined Treatment of Hepatocarcinoma Cells with Maleic Anhydride Derivatives and Quercetin

2017 ◽  
Vol 2017 ◽  
pp. 1-16 ◽  
Author(s):  
Gabriela Carrasco-Torres ◽  
Rafael Baltiérrez-Hoyos ◽  
Erik Andrade-Jorge ◽  
Saúl Villa-Treviño ◽  
José Guadalupe Trujillo-Ferrara ◽  
...  
Keyword(s):  
Hepatocellular Carcinoma ◽  
Cell Cycle ◽  
Maleic Anhydride ◽  
Cancer Cells ◽  
Combination Treatment ◽  
Malignant Tumors ◽  
Combined Treatment ◽  
Current Data ◽  
Carcinoma Cells ◽  
Hepatocellular Carcinoma Cells

The inflammatory condition of malignant tumors continually exposes cancer cells to reactive oxygen species, an oxidizing condition that leads to the activation of the antioxidant defense system. A similar activation occurs with glutathione production. This oxidant condition enables tumor cells to maintain the energy required for growth, proliferation, and evasion of cell death. The objective of the present study was to determine the effect on hepatocellular carcinoma cells of a combination treatment with maleic anhydride derivatives (prooxidants) and quercetin (an antioxidant). The results show that the combination of a prooxidant/antioxidant had a cytotoxic effect on HuH7 and HepG2 liver cancer cells, but not on either of two normal human epithelial cell lines or on primary hepatocytes. The combination treatment triggered apoptosis in hepatocellular carcinoma cells by activating the intrinsic pathway and causing S phase arrest during cell cycle progression. There is also clear evidence of a modification in cytoskeletal actin and nucleus morphology at 24 and 48 h posttreatment. Thus, the current data suggest that the combination of two anticarcinogenic drugs, a prooxidant followed by an antioxidant, can be further explored for antitumor potential as a new treatment strategy.

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