Citric Acid Cross-Linking of Carboxymethyl Sago Starch Based Hydrogel for Controlled Release Application

2018 ◽  
Vol 382 (1) ◽  
pp. 1800086 ◽  
Author(s):  
Nurul Aida Nordin ◽  
Norizah Abdul Rahman ◽  
Norhashidah Talip ◽  
Norzita Yacob
Keyword(s):  
Citric Acid ◽  
Controlled Release ◽  
Cross Linking ◽  
Sago Starch

Multilayer composite beads constructed via layer-by-layer self-assembly for lysozyme controlled release

RSC Advances ◽  
2014 ◽  
Vol 4 (46) ◽  
pp. 24369-24376 ◽  
Author(s):  
Jiemin Zhao ◽  
Xiaoping Wang ◽  
Yanshen Kuang ◽  
Yufeng Zhang ◽  
Xiaowen Shi ◽  
...  
Keyword(s):  
Controlled Release ◽  
Self Assembly ◽  
Cross Linking ◽  
Layer By Layer ◽  
Multilayer Composite ◽  
Composite Beads ◽  
Assembly Technique ◽  
Positively Charged

Alginate (ALG)–lysozyme (LZ) beads were fabricated by a cross-linking process. Negatively charged ALG and positively charged LZ were alternately deposited on the positively charged ALG–LZ beads via a layer-by-layer (LBL) self-assembly technique.

Selective De-Cross-Linking of Transformable, Double-Network Hydrogels: Preparation, Structural Conversion, and Controlled Release

2018 ◽  
Vol 10 (49) ◽  
pp. 42985-42991 ◽  
Author(s):  
Doyoung Jung ◽  
Kyoung Min Lee ◽  
Ji Young Chang ◽  
Misun Yun ◽  
Hak-Jong Choi ◽  
...  
Keyword(s):  
Controlled Release ◽  
Cross Linking ◽  
Structural Conversion ◽  
Double Network

Cross-linking of cellulose and poly(ethylene glycol) with citric acid

2015 ◽  
Vol 90 ◽  
pp. 21-24 ◽  
Author(s):  
Pamela de Cuadro ◽  
Tiina Belt ◽  
Katri S. Kontturi ◽  
Mehedi Reza ◽  
Eero Kontturi ◽  
...  
Keyword(s):  
Citric Acid ◽  
Ethylene Glycol ◽  
Cross Linking ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene

scholarly journals Modified iron phosphate/polyvinyl alcohol composite film for controlled-release fertilisers

RSC Advances ◽  
2018 ◽  
Vol 8 (32) ◽  
pp. 18146-18152 ◽  
Author(s):  
Yi Zhang ◽  
Zhifeng Yi ◽  
Lianmei Wei ◽  
Lingxue Kong ◽  
Lijun Wang
Keyword(s):  
Citric Acid ◽  
Controlled Release ◽  
Polyvinyl Alcohol ◽  
Composite Film ◽  
Iron Phosphate ◽  
Ferric Phosphate ◽  
Polyvinyl Alcohol Films

A new concept of citric acid-stimulus P fertiliser via incorporation of ferric phosphate as P source in polyvinyl alcohol films.

scholarly journals Hydrogel Nanofibers from Carboxymethyl Sago Pulp and Its Controlled Release Studies as a Methylene Blue Drug Carrier

Fibers ◽  
2019 ◽  
Vol 7 (6) ◽  
pp. 56 ◽  
Author(s):  
Nafeesa Mohd Kanafi ◽  
Norizah Abdul Rahman ◽  
Nurul Husna Rosdi ◽  
Hasliza Bahruji ◽  
Hasmerya Maarof
Keyword(s):  
Methylene Blue ◽  
Citric Acid ◽  
Controlled Release ◽  
Drug Carrier ◽  
Curing Temperature ◽  
Buffer Solution ◽  
Release Studies ◽  
Electrospinning Method ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

The potential use of carboxymethyl sago pulp (CMSP) extracted from sago waste for producing hydrogel nanofibers was investigated as a methylene blue drug carrier. Sago pulp was chemically modified via carboxymethylation reaction to form carboxymethyl sago pulp (CMSP) and subsequently used to produce nanofibers using the electrospinning method with the addition of poly(ethylene oxide) (PEO). The CMSP nanofibers were further treated with citric acid to form cross-linked hydrogel. Studies on the percentage of swelling following the variation of citric acid concentrations and curing temperature showed that 89.20 ± 0.42% of methylene blue (MB) was loaded onto CMSP hydrogel nanofibers with the percentage of swelling 4366 ± 975%. Meanwhile, methylene blue controlled release studies revealed that the diffusion of methylene blue was influenced by the pH of buffer solution with 19.44% of MB released at pH 7.34 within 48 h indicating the potential of CMSP hydrogel nanofibers to be used as a drug carrier for MB.

Effect of γ-Fe2O3 Nanoparticles on the Cross-Linking and Final Properties of PVA/Citric Acid-Based Nanocomposites

2020 ◽  
Vol 124 (9) ◽  
pp. 5444-5451
Author(s):  
Irati Barandiaran ◽  
Junkal Gutierrez ◽  
Agnieszka Tercjak ◽  
Galder Kortaberria
Keyword(s):  
Citric Acid ◽  
Cross Linking ◽  
Fe2o3 Nanoparticles ◽  
The Cross

scholarly journals Crosslinked Carboxymethyl Sago Starch/Citric Acid Hydrogel for Sorption of Pb2+, Cu2+, Ni2+ and Zn2+ from Aqueous Solution

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2465
Author(s):  
Amyrah Auni Keirudin ◽  
Norhazlin Zainuddin ◽  
Nor Azah Yusof
Keyword(s):  
Heavy Metal ◽  
Citric Acid ◽  
Sorption Capacity ◽  
Inductively Coupled Plasma ◽  
Emission Spectra ◽  
Sago Starch ◽  
Inductively Coupled ◽  
Sorption Material ◽  
Sem Micrograph ◽  
Ft Ir

In the present study, CMSS (carboxymethyl sago starch)-based hydrogel was synthesized by crosslinking with citric acid via esterification and then applied as a metal sorbent to overcome excessive heavy metal pollution. The CMSS/CA (carboxymethyl sago starch/citric acid) hydrogel was characterized by Fourier Transform Infrared (FT-IR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and X-ray diffraction (XRD). The absorption band at 1726 cm−1 was observed in the FT-IR spectrum of CMSS/CA hydrogel and indicated ester bonds formed. Further findings show that the cross-linkages in the CMSS/CA hydrogel increased the thermal stability of CMSS and various sizes of pores were also shown in the SEM micrograph. Conversely, the removal of heavy metals was analyzed using Inductively Coupled Plasma-Optic Emission Spectra (ICP-OES). The effects of the pH of the metal solution, contact time, initial concentration of the metal ions and temperature on the sorption capacity were investigated. Under optimum condition, the sorption capacity of Pb2+, Cu2+, Ni2+ and Zn2+ onto CMSS/CA hydrogel were 64.48, 36.56, 16.21, 18.45 mg/g, respectively. The experiments demonstrated that CMSS/CA hydrogel has high selectivity towards Pb2+ in both non-competitive and competitive conditions. In conclusion, the CMSS/CA hydrogel as a natural based heavy metal sorption material exhibited a promising performance, especially in the sorption of Pb2+ for wastewater treatment.

scholarly journals Sago Starch-Mixed Low-Density Polyethylene Biodegradable Polymer: Synthesis and Characterization

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Md Enamul Hoque ◽  
Tan Jie Ye ◽  
Leng Chuan Yong ◽  
KhairulZaman Mohd Dahlan
Keyword(s):  
Mechanical Property ◽  
Young’S Modulus ◽  
Biodegradable Polymer ◽  
Young's Modulus ◽  
Starch Content ◽  
Synthesis And Characterization ◽  
Cross Linking ◽  
Content Increase ◽  
Sago Starch ◽  
Elongation At Break

This research focuses on synthesis and characterization of sago starch-mixed LDPE biodegradable polymer. Firstly, the effect of variation of starch content on mechanical property (elongation at break and Young’s modulus) and biodegradability of the polymer was studied. The LDPE was combined with 10%, 30%, 50%, and 70% of sago for this study. Then how the cross-linking with trimethylolpropane triacrylate (TMPTA) and electron beam (EB) irradiation influence the mechanical and thermal properties of the polymer was investigated. In the 2nd study, to avoid overwhelming of data LDPE polymer was incorporated with only 50% of starch. The starch content had direct influence on mechanical property and biodegradability of the polymer. The elongation at break decreased with increase of starch content, while Young’s modulus and mass loss (i.e., degradation) were found to increase with increase of starch content. Increase of cross-linker (TMPTA) and EB doses also resulted in increased Young’s modulus of the polymer. However, both cross-linking and EB irradiation processes rendered lowering of polymer’s melting temperature. In conclusion, starch content and modification processes play significant roles in controlling mechanical, thermal, and degradation properties of the starch-mixed LDPE synthetic polymer, thus providing the opportunity to modulate the polymer properties for tailored applications.

Influence of Citric Acid and Curing Time on Water Uptake

2014 ◽  
Vol 625 ◽  
pp. 123-126 ◽  
Author(s):  
Sohibatul Muizzah Mohamad Izhar ◽  
Ku Zilati Ku Shaari ◽  
Zakaria Man ◽  
Yon Norasyikin Samsudin
Keyword(s):  
Citric Acid ◽  
Water Uptake ◽  
Barrier Properties ◽  
High Water ◽  
Cross Linking ◽  
Curing Time ◽  
Gas Barrier ◽  
Water Sensitivity ◽  
Hydrophilic Character ◽  
Starch Films

Starch is highly promising biopolymer for the production of packaging material since it gives films a good tensile and gas barrier properties. However, non-plasticized starch films are brittle and their hydrophilic character results in poor moisture barrier properties and high water sensitivity. In order to improve films formation and material properties of starch, plasticization and chemical modification such as cross-linking of the starch is required. The cross-linking reaction able to improve thermal stability, tensile strength and decreased the dissolution of starch films in water and formic acid. From the study, the percentage of water uptake reduced when the blending ratio of citric acid increased.The percentage of water uptake highly affected by curing time compared to blending ratio. Increasing the curing time from 1 hour to 2 hour significantly reduced the percentage of water uptake. At 4 hour curing time, the percentage water uptake reached equilibrium faster than 3 hour curing time. This shows that more citric acid molecules were chemically bonded with the starch chains, resulting in higher cross link degree and thus, reduced the percentage of water uptake.

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