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  • The kinetics of the swelling process and the release mechanisms of Coriandrum sativum L. essential oil from chitosan/alginate/inulin microcapsules.

The kinetics of the swelling process and the release mechanisms of Coriandrum sativum L. essential oil from chitosan/alginate/inulin microcapsules.

Food chemistry (2015-11-18)
Cristian Dima, Livia Pătraşcu, Alina Cantaragiu, Petru Alexe, Ştefan Dima
ABSTRACT

The encapsulation by spray drying method of coriander essential oil (CEO) in various materials (chitosan, alginate, chitosan/alginate, chitosan/inulin) was studied. The viscoelastic properties of the oil-in-water (O/W) emulsions and the characteristics of CEO-loaded microcapsules like morphology, moisture, wettability, solubility, flowability properties, swelling and release mechanisms were investigated. The chitosan microcapsules had a brain-like structure while the alginate and chitosan/alginate microcapsules are spherical with a smooth surface. The Compressibility Index (CI=29.09-32.25%) and Hausner Ratio (HR=1.38-1.44) values showed that all the microcapsules prepared correspond to the "poor" flowability powders group. The chitosan microcapsules exhibited the maximum release rate at pH 2.5 while the alginate microcapsules exhibited the maximum release rate at pH 6.5. Kinetics and mechanism of CEO release were studied using various mathematical models such as, zero order, first order, Higuchi model and Peppas model. The diffusional exponent (n) values of Peppas equation explains a non Fickian transport mechanism and diffusion or diffusion-swelling controlled process.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Inulin from dahlia tubers
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L-α-Phosphatidylcholine, from soybean, ≥99% (TLC), lyophilized powder
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Chitosan, from shrimp shells, ≥75% (deacetylated)
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L-α-Phosphatidylcholine, from dried egg yolk, ≥50% (TLC)
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Alginic acid sodium salt from brown algae, Medium viscosity
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L-α-Phosphatidylcholine, solution, from soybean, suitable for cell culture, Type III-S
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L-α-Phosphatidylcholine, egg yolk, Type XVI-E, ≥99% (TLC), lyophilized powder
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L-α-Phosphatidylcholine, egg yolk, Type XIII-E, 100 mg/mL in ethanol, solution
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L-α-Phosphatidylcholine, from soybean, Type IV-S, ≥30% (enzymatic)
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L-α-Phosphatidylcholine, from soybean, Type II-S, 14-29% choline basis
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L-α-Phosphatidylcholine, egg yolk, Type XI-E, 100 mg/mL in chloroform, ≥99%, solution
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L-α-Phosphatidylcholine, hydrogenated, Type I-EH, ≥99%
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L-α-Phosphatidylcholine, from dried egg yolk, Type X-E, ≥40% (enzymatic)
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Chitosan, high molecular weight
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Chitosan, from shrimp shells, practical grade
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Alginic acid sodium salt from brown algae, BioReagent, suitable for immobilization of micro-organisms
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Chitosan, medium molecular weight
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Alginic acid sodium salt, powder
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Alginic acid sodium salt from brown algae, low viscosity
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Sodium phosphate dibasic solution, BioUltra, 0.5 M in H2O
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Citric acid monohydrate, puriss. p.a., ACS reagent, reag. ISO, reag. Ph. Eur., buffer substance, 99.5-102%
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Sodium phosphate dibasic, for molecular biology, ≥98.5% (titration)
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Sodium phosphate dibasic, BioXtra, ≥99.0%
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Sodium phosphate dibasic, ReagentPlus®, ≥99.0%
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Sodium phosphate dibasic, BioReagent, suitable for cell culture, suitable for insect cell culture, ≥99.0%
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Sodium phosphate dibasic, BioUltra, for molecular biology, ≥99.5% (T)
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Citric acid monohydrate, BioXtra, ≥99.5%
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Citric acid monohydrate, puriss., meets analytical specification of Ph. Eur., BP, USP, E330, 99.5-100.5% (based on anhydrous substance), grit
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Chitosan from shrimp shells, low-viscous