The alginate/k-carrageenan ratio's influence on the properties of the cross-linked composite films

Paşcalău, Violeta; Popescu, Vladimir; Popescu, Gabriela; Dudescu, Cristian; Borodi, Gheorghe; Dinescu, Adrian; Perhaița, I.; Paul, Matthew R.

doi:10.1016/j.jallcom.2011.12.026

Cited by 148 publications

(68 citation statements)

References 20 publications

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“…The mass loss and degradation of gel bead was occurred in lower temperatures, indicating that the SA/CMCS gel bead possessed less compact structure than the pure CMCS and SA [33]. The first endothermic peak (in Fig.5b) exhibited in all samples between 30 and 100°C is related to water desorption.…”

Section: Resultsmentioning

confidence: 91%

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Alginate/carboxymethyl chitosan composite gel beads for oral drug delivery

Peng

et al. 2016

J Polym Res

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This paper reports the synthesis of pH-sensitive gel beads derived from alginate (SA) and carboxymethyl chitosan (CMCS) for drug delivery. The composite SA/CMCS gel beads were prepared by dual ionic gelation: one ionic gelation between SA and Ca 2+ and another one between CMCS and β-Sodium glycerophosphate (β-GP). The structure properties of hydrogel beads were characterized by SEM, IR and TG technique. The influence of the polymer composition and crosslinkers on the gel swelling property was investigated. When the concentration of CMCS and SA were 3 % and the volume ratio was 1:2, the swelling rate of gel beads crosslinked by β-GP and CaCl 2 solution can increase up to 31.2 and the swelling time can reach 10.5 h. In the drug release study, bovine serum albumin (BSA) was chosen as model drugs. The results indicated that BSA released slowly from the gel beads at pH 1.2 and the release ratio was about 10 %. At pH 7.4, the amounts of BSA released increased significantly as compared to those released at pH 1.2 and the total release time was extended to 11 h. The composite gel system demonstrates sustained release profile and pH sensitivity, which can be considered as good candidates for oral drug delivery systems.

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Section: Resultsmentioning

confidence: 91%

“…The first endothermic peak (in Fig.5b) exhibited in all samples between 30 and 100°C is related to water desorption. The second endothermic bond is due to the destruction of glycosidic bonds [33]. Gel endothermic peak appears at about 240°C-290°C, while SA and CS were at 240°C and 290°C, respectively.…”

Section: Resultsmentioning

confidence: 99%

Alginate/carboxymethyl chitosan composite gel beads for oral drug delivery

Peng

et al. 2016

J Polym Res

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“…3E) indicate the amorphous structure of all samples [17]. The broad peaks at 2θ of ~8.3 o and ~20.6 o were associated with the carrageenan [17], and gradually disappeared with decreasing carrageenan contents. Kappa-carrageenan is more hydrophobic than alginate, showing a contrasting role in absorption.…”

Section: Materials Characterizationmentioning

confidence: 92%

“…In the IR spectra (Fig. 3D), characteristic bands at 1420 cm −1 and 1597 cm −1 are attributed to asymmetric and symmetric stretching vibrations of COO − groups on the polymeric backbone of calcium alginate [17]. Carrageenan shows a characteristic band at 1258 cm −1 due to the sulphate stretch of S=O [17].…”

Section: Materials Characterizationmentioning

confidence: 97%

Sustainable composite super absorbents made from polysaccharides

Hong

Hui³

2016

Materials Letters

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Compared to traditional super absorbent polymers using raw materials from petrochemical industry, natural polymer absorbents are more favorable because they are sustainable and biodegradable. In this study, composite absorbents were developed by crosslinking carrageenan with sodium alginate using calcium chloride. Effect of composition on absorption was tested. Absorption was improved by increasing carrageenan content. The super absorbent exhibited the maximal swelling ratio of 13.1 g/g in 0.9% saline water in just 5 minutes. The maximal tensile strength was reached with a value of 12.8 MPa. Water contact angle revealed that carrageenan is more hydrophobic than sodium alginate. Presence of sulfate groups might be a key factor promoting absorption. The scanning electron microscopic images showed that the composite material had a structure with alginate arranged at the outside surface. These results demonstrate that a sustainable and biodegradable absorbent was successfully developed with a matrix of properties for potential application in diapers.

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“…They have studied how the addition of various proteins, such as, soy, whey, and gelatin influence the properties of “dry” alginate films (Shih ; Villagomez‐Zavala and others ; Wang, Auty and Kerry ). Alginate composite films have also been produced using other polysaccharides including kappa‐carrageenan, pectin, pullulan, carboxy‐methyl cellulose, and sago starch (Xu and others ; Tong and others ; Da Silva and others ; Fazilah and others ; Gohil ; Da Bierhalz and others ; Paşcalău and others ; Xiao and others ; Galus and Lenart ). In certain cases, the alginate–carbohydrate composite films had superior properties compared to their individual component films (Fazilah and others ; Galus and Lenart ; Paşcalău and others ).…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Microstructural Properties of “Wet” Alginate and Composite Films Containing Various Carbohydrates

Harper

Barbut

Smith

et al. 2014

Journal of Food Science

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Composite "wet" alginate films were manufactured from alginate-carbohydrate solutions containing 5% alginate and 0.25% pectin, carrageenan (kappa or iota), potato starch (modified or unmodified), gellan gum, or cellulose (extracted or commercial). The "wet" alginate films were used as a model to understand co-extruded alginate sausage casings that are currently being used by several sausage manufacturers. The mechanical, optical, and microstructural properties of the calcium cross-linked composite films were explored. In addition, the water holding capacity and textural profile analysis properties of the alginate-carbohydrate gels were studied. The results indicate that the mechanical properties of "wet" alginate films/casings can be modified by adding various carbohydrates to them. Alginate films with pectin, carrageenan, and modified potato starch had significantly (P < 0.05) greater elongation values than pure alginate films. The alginate-pectin films also had greater (P < 0.05) tensile strengths than the pure alginate films. Alginate films with extracted cellulose, commercial cellulose, and modified potato starch had lower (P < 0.05) puncture force, distance, and work values than the alginate control films. Transmission electron microscopy images showed a very uniform alginate network in the control films. Several large cellulose fibers were visible in the films with extracted cellulose, while the cellulose fibers in the films with commercial cellulose were difficult to distinguish. Despite these apparent differences in cellulose fiber length, the 2 cellulose films had similar puncture and tensile properties.

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The alginate/k-carrageenan ratio's influence on the properties of the cross-linked composite films

Cited by 148 publications

References 20 publications

Alginate/carboxymethyl chitosan composite gel beads for oral drug delivery

Alginate/carboxymethyl chitosan composite gel beads for oral drug delivery

Sustainable composite super absorbents made from polysaccharides

Mechanical and Microstructural Properties of “Wet” Alginate and Composite Films Containing Various Carbohydrates

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