Development and evaluation of alginate–chitosan nanocapsules for controlled release of acetamiprid

Kumar, Sandeep; Chauhan, Neetu; Gopal, Madhuban; Kumar, Rajesh; Dilbaghi, Neeraj

doi:10.1016/j.ijbiomac.2015.08.062

Cited by 150 publications

(73 citation statements)

References 34 publications

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“…The bands at 2923-2925 cm 21 in the spectra are attributed to the aromatic C-H stretching vibration. The one significant change in the alginate beads of palmarosa distillation waste occurred on the band at 1663 cm 21 [22,23]. The more intense peak for alginate beads indicates that it contains more carboxyl groups than raw waste and this may be due to the presence of asymmetrical stretching of carboxylate anion of alginate molecules.…”

Section: Characterization Of Prepared Pdwabmentioning

confidence: 98%

Entrapment of distilled palmarosa (cymbopogon martinii) wastes in alginate beads for adsorptive removal of methylene blue from aqueous solution

Saha

Tripathy

Basak

et al. 2018

Env Prog and Sustain Energy

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This study described a preparation of a low‐cost adsorbent by entrapment of palmarosa distillation wastes into alginate as supporting matrix and use of it for methylene blue (MB) dye removal from aqueous solution. Fourier transform infrared spectroscopy (FTIR) data of adsorbent confirms the entrapment for formation of composite beads. The effects of adsorption parameters (adsorbent dose, temperature, initial dye concentration, and pH) were investigated. Time to reach the equilibrium was dependent on dye concentration and it was 120 min for lower concentration and 240 min for higher concentration. The analysis of the kinetic data by pseudo‐first‐order and pseudo‐second‐order models displayed that MB adsorption followed pseudo‐second‐order model. The equilibrium data of MB adsorption were described by applying the Langmuir, Freundlich, and Temkin models. The observations from adsorption isotherms indicated that Langmuir model is the best fitted model and the maximum adsorption capacity (at the optimum pH 9.0) improved from 5.71 to 6.45 mg/g as the temperature increased from 298 to 328 K. The thermodynamic studies demonstrated that MB adsorption on to the adsorbent was spontaneous, feasible, and endothermic. Low desorption of the dyes from the adsorbent indicates that the dyes might have been chemisorbed on to the adsorbent surface. A single‐stage batch adsorber was designed and quantity of adsorbent required for treating 1–10 L of stained water was determined based on the Langmuir isotherm model equation. Results indicate that the composite bead could be an alternative for relatively costly adsorbents used for remediation of MB dye bearing industrial effluents. © 2018 American Institute of Chemical Engineers Environ Prog, 37: 1901–1907, 2018

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Section: Characterization Of Prepared Pdwabmentioning

confidence: 98%

Entrapment of distilled palmarosa (cymbopogon martinii) wastes in alginate beads for adsorptive removal of methylene blue from aqueous solution

Saha

Tripathy

Basak

et al. 2018

Env Prog and Sustain Energy

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“…Incorporation of compounds such as citric acid, sodium, calcium and zinc salts can also modify the drug release rates of brown APS delivery systems [99,110,111]. Furthermore, drug release targeting can be made more accurate by innovative modulations with chitosan, gelatine and pectin [112][113][114][115][116][117]. These modulations often have superior pH stability and bioadhesive properties and can, e.g., enable the release of active compounds in the colon by biodegrading [118].…”

Section: Brown Algae Sulfated Polysaccharides As Drug Delivery Systemmentioning

confidence: 99%

Advanced Technologies for the Extraction of Marine Brown Algal Polysaccharides

et al. 2020

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Over the years, brown algae bioactive polysaccharides laminarin, alginate and fucoidan have been isolated and used in functional foods, cosmeceutical and pharmaceutical industries. The extraction process of these polysaccharides includes several complex and time-consuming steps and the correct adjustment of extraction parameters (e.g., time, temperature, power, pressure, solvent and sample to solvent ratio) greatly influences the yield, physical, chemical and biochemical properties as well as their biological activities. This review includes the most recent conventional procedures for brown algae polysaccharides extraction along with advanced extraction techniques (microwave-assisted extraction, ultrasound assisted extraction, pressurized liquid extraction and enzymes assisted extraction) which can effectively improve extraction process. The influence of these extraction techniques and their individual parameters on yield, chemical structure and biological activities from the most current literature is discussed, along with their potential for commercial applications as bioactive compounds and drug delivery systems.(APS) is determined by algae species however it is also influenced by other factors causing inter-species variation, e.g., growth location and harvesting season [8]. Vast structural variation between the APS therefore presents a challenge in terms of pre-treatments application, extraction techniques and optimization, characterization of isolated fractions and determination of their biological properties.Chemical structure and yield of APS isolated from marine macroalgae by conventional extraction (CE) techniques can be affected by various experimental conditions (pH, time, temperature, pressure, particle size, solvent, sample to solvent ratio, agitation speed etc.). In addition, different advanced techniques such as microwave assisted extraction (MAE), ultrasound assisted extraction (UAE), pressurized liquid extraction (PLE), enzyme-assisted extractions (EAE) are assessed and applied for APS extraction [9][10][11].In general, the chemical structure of polysaccharides determines its physical, chemical and biochemical properties as well as its biological activities [12]. Several studies have reported that their biological activity is strongly associated with their chemical structure [9]. Due to very complex mechanisms that are affected by many factors, the correlation between polysaccharide structure and biological activity is still not sufficiently clarified.In order to improve isolation of APS, pre-treatments are usually applied to the algal biomass prior to the extraction process with the two aims: (i) to prevent co-extraction of interfering bioactive compounds with similar solubility; and (ii) to disrupt cell walls and improve mass transfer of APS into extraction solvent. The first type of pre-treatments is therefore used to remove compounds which are highly bound to the APS such as proteins, phenols and lipids, as well as mannitol and chlorophyll [13]. For that purpose, the application of various pr...

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“…The diffusion-controlled release of methomyl at pH 6.0 with t 1/2 of 36-70 h has been obtained by its encapsulation into carboxymethyl chitosan and azidobenzaldehyde [31]. The release of the insecticide acetamiprid from nanocapsules of chitosan-alginate was reported to be pH-dependent, in which half of the acetamiprid was released after 36 h at pH 7.0 and 4.0 compared to only 24 h needed to release the same amount at pH 10 [32]. been obtained by its encapsulation into carboxymethyl chitosan and azidobenzaldehyde [31].…”

Section: Controlled Release Formulationsmentioning

confidence: 99%

“…been obtained by its encapsulation into carboxymethyl chitosan and azidobenzaldehyde [31]. The release of the insecticide acetamiprid from nanocapsules of chitosan-alginate was reported to be pHdependent, in which half of the acetamiprid was released after 36 h at pH 7.0 and 4.0 compared to only 24 h needed to release the same amount at pH 10 [32].…”

Section: Controlled Release Formulationsmentioning

confidence: 99%

“…The nanoformulations were developed with a photo-controlled release mechanism [46]. In another work, a smart formulation of chitosan-alginate nanocapsules (30-40 nm diameter size of HRTEM) was developed for the controlled release of acetamiprid, in which the controlled release properties was achieved at three different pHs, where a 50% insecticide release was found after 24 h at pH 10 and after 24 h at pH 7 and 4, compared to only about 6 h for the conventional insecticide release at all pHs [32]. Carboxymethyl chitosan incorporating ricinoleic acid was developed for a 200-500 nm (hydrodynamic size) nanoemulsion of azadirachtin.…”

Section: Biocides Against Plant Pathogens and Pestsmentioning

confidence: 99%

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Chitosan-Based Agronanochemicals as a Sustainable Alternative in Crop Protection

Maluin

2020

Molecules

149

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The rise in the World’s food demand in line with the increase of the global population has resulted in calls for more research on the production of sustainable food and sustainable agriculture. A natural biopolymer, chitosan, coupled with nanotechnology could offer a sustainable alternative to the use of conventional agrochemicals towards a safer agriculture industry. Here, we review the potential of chitosan-based agronanochemicals as a sustainable alternative in crop protection against pests, diseases as well as plant growth promoters. Such effort offers better alternatives: (1) the existing agricultural active ingredients can be encapsulated into chitosan nanocarriers for the formation of potent biocides against plant pathogens and pests; (2) the controlled release properties and high bioavailability of the nanoformulations help in minimizing the wastage and leaching of the agrochemicals’ active ingredients; (3) the small size, in the nanometer regime, enhances the penetration on the plant cell wall and cuticle, which in turn increases the argochemical uptake; (4) the encapsulation of agrochemicals in chitosan nanocarriers shields the toxic effect of the free agrochemicals on the plant, cells and DNA, thus, minimizing the negative impacts of agrochemical active ingredients on human health and environmental wellness. In addition, this article also briefly reviews the mechanism of action of chitosan against pathogens and the elicitations of plant immunity and defense response activities of chitosan-treated plants.

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Development and evaluation of alginate–chitosan nanocapsules for controlled release of acetamiprid

Cited by 150 publications

References 34 publications

Entrapment of distilled palmarosa (cymbopogon martinii) wastes in alginate beads for adsorptive removal of methylene blue from aqueous solution

Entrapment of distilled palmarosa (cymbopogon martinii) wastes in alginate beads for adsorptive removal of methylene blue from aqueous solution

Advanced Technologies for the Extraction of Marine Brown Algal Polysaccharides

Chitosan-Based Agronanochemicals as a Sustainable Alternative in Crop Protection

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