Study pulsating electrospray of non-Newtonian and thixotropic sodium alginate solution

Tabeei, A.; Samimi, Abdolreza; Khorram, Mohammad; Moghadam, Hamid

doi:10.1016/j.elstat.2011.10.006

Cited by 16 publications

(10 citation statements)

References 17 publications

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“…This avoids several irregular modifications of the functions and cellular mechanisms due to the high viscosity of the solution. Previous studies have emphasized that lower concentrations (<2% w/v ) of alginates in aqueous solution represent Newtonian flow while, higher concentrations (>2% w/v ) improve viscosity and shear thinning behavior [ 24 , 25 , 26 , 27 ]. The bioelicitor concentration of 3 g/L was chosen according to the previous study, which was carried out under the same conditions on tomato seedlings [ 6 ].…”

Section: Resultsmentioning

confidence: 99%

Induction of Natural Defenses in Tomato Seedlings by Using Alginate and Oligoalginates Derivatives Extracted from Moroccan Brown Algae

et al. 2020

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Polysaccharides extracted from marine algae have attracted much attention due to their biotechnological applications, including therapeutics, cosmetics, and mainly in agriculture and horticulture as biostimulants, biofertilizers, and stimulators of the natural defenses of plants. This study aimed to evaluate the ability of alginate isolated from Bifurcaria bifurcata from the Moroccan coast and oligoalginates derivatives to stimulate the natural defenses of tomato seedlings. Elicitation was carried out by the internodal injection of bioelicitor solutions. The elicitor capacities were evaluated by monitoring the activity of phenylalanine ammonia-lyase (PAL) as well as polyphenols content in the leaves located above the elicitation site for 5 days. Alginate and oligoalginates treatments triggered plant defense responses, which showed their capacity to significantly induce the PAL activity and phenolic compounds accumulation in the leaves of tomato seedlings. Elicitation by alginates and oligoalginates showed an intensive induction of PAL activity, increasing from 12 h of treatment and remaining at high levels throughout the period of treatment. The amount of polyphenols in the leaves was increased rapidly and strongly from 12 h of elicitation by both saccharide solutions, representing peaks value after 24 h of application. Oligoalginates exhibited an effective elicitor capacity in polyphenols accumulation compared to alginate polymers. The alginate and oligosaccharides derivatives revealed a similar elicitor capacity in PAL activity whereas the accumulation of phenolic compounds showed a differential effect. Polysaccharides extracted from the brown seaweed Bifurcaria bifurcate and oligosaccharides derivatives induced significantly the phenylpropanoid metabolism in tomato seedlings. These results contribute to the valorization of marine biomass as a potential bioresource for plant protection against phytopathogens in the context of eco-sustainable green technology.

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Section: Resultsmentioning

confidence: 99%

Induction of Natural Defenses in Tomato Seedlings by Using Alginate and Oligoalginates Derivatives Extracted from Moroccan Brown Algae

et al. 2020

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“…In this mode of spraying, beads production rate increased with increase of flow rate and consequently, results in decrease of beads size. Shear thinning behavior of alginate solution is the other reason . Shear rate at nozzle tip increases with increase of flow rate and finally non‐Newtonian behavior of solution leads to decrease of apparent viscosity that consequently results in decrease of the radius of the beads.…”

Section: Resultsmentioning

confidence: 99%

Electrospray preparation of propranolol‐loaded alginate beads: Effect of matrix reinforcement on loading and release profile

Khorram

Samimi

et al. 2014

J of Applied Polymer Sci

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In the present study, propranolol loaded-calcium alginate beads were prepared from concentrated solutions of sodium alginate, using combined method of electrospray and ionotropic gelation. The objectives of the study were to increase the propranolol-HCl loading and to decrease its initial burst release. However, the effects of voltage, nozzle diameter, flow rate, and concentration of sodium alginate on size of the beads and drug entrapment efficiency (DEE) were also investigated. The matrix of alginate beads was reinforced with dextran sulfate and/or coated with chitosan. The mean particle size of the beads, their swelling behavior, and drug entrapment efficiency were characterized. Furthermore, the drug release profiles from the prepared beads in simulated gastric fluid and intestinal fluid were evaluated and compared. Among the parameters that affected the electrospray of alginate, voltage had a pronounced effect on the size of beads. The size of beads was reduced to a minimum value on increasing the voltage. Furthermore, increasing the flow rate, alginate concentration, and nozzle diameter and decreasing the voltage led to improvement in DEE. Enhancing the alginate concentration as well as coating with chitosan and reinforcing with dextran sulfate led to increase of the encapsulation efficiency and therefore decrease of the drug release rate in both pHs.

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“…Xie and Wang (2007) demonstrated the fabrication of uniform alginate microbeads having diameters ranging from 200 μm to 2 mm by performing electrospray in the dripping mode through an additional ring electrode. Tabeei et al (2012) showed the use of a pulsating DC electric field for production of alginate beads in millimeter scale at a critical frequency could result in a narrow size distribution. In a separate work, Park et al (2012a) examined different concentrations and flow rates for the production of alginate beads, indicating alginate beads with diameter less than 150 μm can be achieved using a low alginate concentration (<1.0 wt%) and a low flow rate (< 2 ml.h −1 ).…”

Section: Compositionmentioning

confidence: 99%

Electrohydrodynamic atomization: A two-decade effort to produce and process micro-/nanoparticulate materials

Xie

Jiang

Davoodi

et al. 2015

Chemical Engineering Science

262

159

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Electrohydrodynamic atomization (EHDA), also called electrospray technique, has been studied for more than one century. However, since 1990s it has begun to be used to produce and process micro-/nanostructured materials. Owing to the simplicity and flexibility in EHDA experimental setup, it has been successfully employed to generate particulate materials with controllable compositions, structures, sizes, morphologies, and shapes. EHDA has also been used to deposit micro- and nanoparticulate materials on surfaces in a well-controlled manner. All these attributes make EHDA a fascinating tool for preparing and assembling a wide range of micro- and nanostructured materials which have been exploited for use in pharmaceutics, food, and healthcare to name a few. Our goal is to review this field, which allows scientists and engineers to learn about the EHDA technique and how it might be used to create, process, and assemble micro-/nanoparticulate materials with unique and intriguing properties. We begin with a brief introduction to the mechanism and setup of EHDA technique. We then discuss issues critical to successful application of EHDA technique, including control of composition, size, shape, morphology, structure of particulate materials and their assembly. We also illustrate a few of the many potential applications of particulate materials, especially in the area of drug delivery and regenerative medicine. Next, we review the simulation and modeling of Taylor cone-jet formation for a single and co-axial nozzle. The mathematical modeling of particle transport and deposition is presented to provide a deeper understanding of the effective parameters in the preparation, collection and pattering processes. We conclude this article with a discussion on perspectives and future possibilities in this field.

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Study pulsating electrospray of non-Newtonian and thixotropic sodium alginate solution

Cited by 16 publications

References 17 publications

Induction of Natural Defenses in Tomato Seedlings by Using Alginate and Oligoalginates Derivatives Extracted from Moroccan Brown Algae

Induction of Natural Defenses in Tomato Seedlings by Using Alginate and Oligoalginates Derivatives Extracted from Moroccan Brown Algae

Electrospray preparation of propranolol‐loaded alginate beads: Effect of matrix reinforcement on loading and release profile

Electrohydrodynamic atomization: A two-decade effort to produce and process micro-/nanoparticulate materials

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