Production and Properties of Mononuclear Microcapsules Encapsulating Cinnamon Oil by Complex Coacervation

2013 ◽  
Vol 477-478 ◽  
pp. 1229-1233 ◽  
Author(s):  
Wan Long Liu ◽  
Zuo Bing Xiao ◽  
Guang Yong Zhu ◽  
Ru Jun Zhou ◽  
Er Qin Wang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Encapsulation Efficiency ◽  
Wall Material ◽  
Loading Capacity ◽  
Complex Coacervation ◽  
Cinnamon Oil ◽  
Thermogravimetric Analyzer ◽  
Mean Size ◽  
Scanning Electron

The aim of present study was to prepare the mononuclear microcapsules containing cinnamon oil (CO) using a complex coacervation method with gelatin and pectin as wall material. The surface morphology of microcapsule was characterized by optical microscopy and scanning electron microscopy (SEM). Then the microcapsules were analyzed by thermogravimetric analyzer (TGA) to confirm the cinnamon oil had been successfully embedded into the microcapsules and determine the loading capacity. The results showed that the microcapsules were uniform in size, spherical with a mean size of 13.6 ± 4.8μm. The microencapsulation yield, loading capacity and encapsulation efficiency were 65.4±3.3%, 43.3±1.3% and 42.4±1.7%, respectively.

scholarly journals Fabrication of Drug-Loaded Starch-based Nanofibers via Electrospinning Technique

2020 ◽  
Vol 11 (3) ◽  
pp. 10801-10811
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Poly Vinyl Alcohol ◽  
Loading Capacity ◽  
Sago Starch ◽  
Electrospinning Technique ◽  
Blending Process ◽  
Operation Parameters ◽  
Optimized Conditions ◽  
Scanning Electron

This paper reported the fabrication of starch-based nanofibers derived from various weight ratios (w:w) of native sago starch (SS) and poly (vinyl alcohol) (PVA) (0:100, 1:100, 3:100, and 5:100) using the electrospinning technique. The effects of electrospinning operation parameters on the surface morphology of SS/PVA nanofibers were observed by using Scanning Electron Microscopy (SEM). The smooth and bead-free SS/PVA nanofibers with fiber diameters within the range of 90 nm to 150 nm were produced under the optimized conditions. The paracetamol (PCM) was encapsulated into the SS/PVA nanofibers via the blending process. The SS/PVA nanofibers exhibited a maximum PCM loading capacity of 0.9573 mg.mg-1, and PCM was observed to release out from SS/PVA nanofibers slowly and steadily for 72 hours.

Preparation of Thermoresponsive Chitosan Polymers and Its Application Controlling Release of Antifouling Agent

2013 ◽  
Vol 562-565 ◽  
pp. 664-667 ◽  
Author(s):  
Feng Ling Xu ◽  
Cun Guo Lin ◽  
Ji Yong Zheng ◽  
Jin Wei Zhang ◽  
Li Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Encapsulation Efficiency ◽  
Sodium Tripolyphosphate ◽  
Ionic Gelation ◽  
Gelation Process ◽  
Chitosan Microparticles ◽  
Antifouling Agent ◽  
Physicochemical Structure ◽  
Scanning Electron

Thermoresponsive chitosan copolymers embed with antifouling agent paeonol in chitosan(CS) microparticles were prepared and the release dynamics was studied at different temperature. Chitosan microparticles have been formed based on ionic gelation process of CS and sodium tripolyphosphate (TPP). Paeonol was incorporated into the CS microparticles with the size about 0.1 μm. The physicochemical structure of samples was analyzed by FTIR and scanning electron microscopy (SEM). We investigated the influence of sodium tripolyphosphate (TPP) and paeonol on Encapsulation efficiency. Increasing TPP concentration from 1 to 3 mg/ml increased encapsulation efficiency of paeonol from 63% to 92%. Increasing peaonol concentration from 1.0 to 3.0 mg/ml increased peaonol encapsulation efficiency from 72% to 85%.

Preparation and Properties of Rigid Cross-Linked PVC Foam

2011 ◽  
Vol 311-313 ◽  
pp. 1056-1060 ◽  
Author(s):  
Ai Hua Shi ◽  
Guang Cheng Zhang ◽  
Heng Tai Pan ◽  
Zhong Lei Ma ◽  
Chen Hui Zhao
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Weight Loss ◽  
Cellular Structure ◽  
High Performance ◽  
Chemical Structure ◽  
Molding Process ◽  
Thermogravimetric Analyzer ◽  
Infrared Spectrometer ◽  
Scanning Electron

High performance rigid cross-linked PVC foam has been prepared by molding process and boiling foam process with the main materials including polyvinyl chloride paste resin (PVC), liquefied methylene bis-phenyl diisocyanate (MDI-L) and methylhexahydrophthalic anhydride (MHHPA). The chemical structure, cellular structure and thermal properties were respectively characterized by fourier transform infrared spectrometer (FTIR), scanning electron microscopy (SEM), thermomechanical analyzer (TMA) and thermogravimetric analyzer (TGA). Results showed that the foam had a uniform cellular structure, and cell size was about 760μm. The glass transition temperature (Tg) was 81°C and 5% weight loss temperature (T5d) was 252°C.

Green and facile synthesis of Fe3O4 nanoparticles using the Citrus aurantifolia fruit juice associated with NaBH4 and its adsorption of Cr(VI) in aqueous solution

2021 ◽  
Vol 10 (4) ◽  
pp. 86-96
Author(s):  
Thanh Luong Huynh Vu ◽  
Hao Dao Lam Gia ◽  
Trang Phan Thi Diem ◽  
Tien Pham Minh ◽  
Quyen Tran Thi Bich ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Scanning Electron Microscopy ◽  
Fe3o4 Nanoparticles ◽  
Effective Parameters ◽  
X Ray Diffraction ◽  
Citrus Aurantifolia ◽  
X Ray ◽  
Mean Size ◽  
Scanning Electron

This work presents a facile and green method using Citrus aurantifolia fruit extract for the biosynthesis of magnetite nanoparticles (MNs). The effects of some effective parameters such as temperature, reaction time and the ratio of Citrus aurantifolia extract to sodium borohydride on the synthesis were investigated. The synthesized Fe3O4 nanoparticles were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FE-SEM), energy-dispersive X- ray spectroscopy (EDX), transmission scanning electron microscopy (TEM), and vibrating sample magnetometer (VSM). The results showed that the MNs were well-monodisperse with the mean size of 50 nm and superparamagnetism value of 40.1 emu/g. Adsorption of Cr(VI) in aqueous solution at pH 2.5 using MNs reached 94.9% for removal of Cr(VI). The main contribution of this work was the synthesis of MNs in an economical and environmental friendly way, achieving size-controlled MNs at mild conditions. A possible mechanism of MNs synthesis was also presented.

Laser ablation of nanoparticles and nanoparticulate, thick Fe1.92Tb0.3Dy0.7 films

2010 ◽  
Vol 25 (9) ◽  
pp. 1733-1740 ◽  
Author(s):  
J. Ma ◽  
M.F. Becker ◽  
J.W. Keto ◽  
D. Kovar
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Laser Ablation ◽  
Processing Parameters ◽  
Processing Conditions ◽  
Transmission Electron ◽  
Resistance To Oxidation ◽  
Mean Size ◽  
Scanning Electron

Two laser processes, flat plate ablation (FPA) and laser ablation of microparticle aerosols (LAMA), capable of producing nanoparticles and nanoparticulate thick films of Terfenol-D (Fe1.92Tb0.3Dy0.7) were investigated. The influence of processing parameters on the sizes, compositions, and morphologies of the nanoparticles produced using these processes were studied by transmission electron microscopy. The nanoparticles were used to deposit nanoparticulate films by supersonic impaction with thicknesses ranging from 4 to 50 μm, depending on processing conditions. The microstructures and properties of the films were studied using scanning electron microscopy and magnetometry. The LAMA process produced nanoparticles with a mean size and standard deviation (SD) of 8 to 10 nm ± 5 nm, depending on the type of gas used during synthesis. In contrast, nanoparticles produced using the FPA process exhibited a much broader size distribution varying from 5 to 150 nm and a much greater variation in compositions compared to the LAMA process. Films produced using LAMA also had lower levels of porosity compared to those produced using FPA as a result of the smaller, more uniform nanoparticles from which they were produced and the resulting higher impaction velocities. Compared to the FPA-produced films, the LAMA-produced films exhibited greater resistance to oxidation, higher magnetizations (13–15 emu/g versus 9–11 emu/g, depending on processing conditions) and lower coercivities (versus 41–59 Oe versus 80–110 Oe).

Characteristics and Release Behavior of Sodium Alginate Microencapsulation Containing Cinnamon Oil

2010 ◽  
Vol 152-153 ◽  
pp. 508-511 ◽  
Author(s):  
Xi Hong Li ◽  
Juan Yun ◽  
Ya Ge Xing ◽  
Chang Liu ◽  
Qing Lian Xu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Relative Humidity ◽  
Core Material ◽  
Release Behavior ◽  
Cinnamon Oil ◽  
Mean Diameter ◽  
The Mean ◽  
The Stability ◽  
Scanning Electron

Microencapsulation technology is widely used in many industries recently because the stability of core material can be improved and the release characteristics can be modified. In this investigation, cinnamon oil was microencapsulated by simple coacervation. The size distribution is narrow and the mean diameter is 53.79 μm. The surface morphology of the resultant microcapsules was also characterized scanning electron microscopy (SEM). The results showed that the rates of cinnamon oil released from microencapsulation were not only affected by relative humidity in the microenvironment around microencapsulated powder, but also affected by the temperature.

The Synthesis of Lithium Aluminate Materials and its Performance of CO2 Absorption

2013 ◽  
Vol 669 ◽  
pp. 115-118 ◽  
Author(s):  
Yin Jie Wang ◽  
Ji Ping Liu ◽  
Mei Xiu Kan ◽  
Ze Quan Liu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Temperature ◽  
Raw Materials ◽  
Co2 Absorption ◽  
Lithium Aluminate ◽  
X Ray ◽  
Thermogravimetric Analyzer ◽  
Α Al2o3 ◽  
Scanning Electron

Use Nanoscale α-Al2O3 as raw materials, prepared by high temperature solid state reaction, we produced the Lithium Aluminate (Li5AlO4) which can directly absorb CO2 at a temperature between 450°C and 650°C. Respectively use the method of scanning electron microscopy (SEM)、X-ray powder diffractometer (XRD) and thermogravimetric analyzer (TG) for the morphology、structure and the performance of CO2 absorption analysises. The results show that the synthesized Lithium Aluminate (Li5AlO4) materials have a performance of CO2 absorption.

scholarly journals Microencapsulation of guava pulp using prebiotic wall material

2021 ◽  
Vol 24 ◽  
Author(s):  
Jéssica Chaves Rivas ◽  
Lourdes Maria Correa Cabral ◽  
Maria Helena Miguez da Rocha-Leão
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Antioxidant Activity ◽  
Spray Drying ◽  
Carotenoid Content ◽  
Wall Material ◽  
X Ray Diffraction ◽  
X Ray ◽  
Over Time ◽  
Scanning Electron

Abstract Important functional compounds present in fruits are often lost in technological processes and during storage. Microencapsulation technique allows maintaining the compounds of interest and adding value to the product using functional encapsulating materials. This work aimed to produce microencapsulated guava pulp using the spray-drying technique and a functional encapsulant material, i.e., a mix of inulin and maltodextrin. The guava pulp was analyzed for centesimal composition, carotenoid content, and antioxidant activity. The microspheres were analyzed for retention of carotenoids, antioxidant activity over time, and morphology by Scanning Electron Microscopy (SEM) and X-ray diffraction. Two proportions of coating material could maintain the antioxidant activity of guava pulp. The microencapsulation with a higher percentage of inulin is a preferred option due to the good results of retention and stability regarding antioxidant activity over time, relevant retention of the carotenoid content, and a more stable microstructure. In addition, inulin can add value to powders owing to its inherent functional properties. The product obtained in the study is innovative and interesting, as well as may provide a capable use of these materials as encapsulated agents. In fact, it can be considered a potential functional ingredient.

Hydroxyapatite Coating Influenced by Ti6Al4V Substrate Roughness

2015 ◽  
Vol 638 ◽  
pp. 62-66
Author(s):  
Florin Constantinescu ◽  
Robert Ciocoiu ◽  
Octavian Trante ◽  
Ion Ciucă
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Surface Roughness ◽  
Crystal Morphology ◽  
Crystal Shape ◽  
Substrate Roughness ◽  
Force Microscopy ◽  
Atomic Force ◽  
Mean Size ◽  
Scanning Electron

In this paper the author’s main goal was to determine if the roughness of the substrate (a Ti6Al4V alloy) shows any influence on the hydroxyapatite (HA) crystal morphology and distribution. Disks of Ti6Al4V, 24mm in diameter and 1mm thickness are sandblasted with Al2O3particles with different mean size: 29, 45 and 110μm. The disks are analyzed prior coating by atomic force microscopy (AFM) to determine the surface roughness. The samples are then cleaned and coated with HA by immersion in a solution derived from [Ca (NO3)2.4H2O] and P2O5dissolved in ethylene glycol – the process was repeated 3 times. The coated samples are analyzed by scanning electron microscopy (SEM) to observe HA crystal shape, size and distribution.

Microscopic Examination of Chitosan–Polyphosphate Beads with Entrapped Spores of the Biocontrol Agent,Streptomyces melanosporofaciensEF-76

2005 ◽  
Vol 11 (2) ◽  
pp. 154-165 ◽  
Author(s):  
Guy Jobin ◽  
Gilles Grondin ◽  
Geneviève Couture ◽  
Carole Beaulieu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Microscopic Examination ◽  
Biocontrol Agent ◽  
Porous Surface ◽  
Macromolecular Complex ◽  
Complex Coacervation ◽  
Chitosan Beads ◽  
Streptomyces Melanosporofaciens ◽  
Scanning Electron

Spores of the biocontrol agent,Streptomyces melanosporofaciensEF-76, were entrapped by complex coacervation in beads composed of a macromolecular complex (MC) of chitosan and polyphosphate. A proportion of spores entrapped in beads survived the entrapment procedure as shown by treating spores from chitosan beads with a dye allowing the differentiation of live and dead cells. The spore-loaded chitosan beads could be digested by a chitosanase, suggesting that, once introduced in soil, the beads would be degraded to release the biocontrol agent. Spore-loaded beads were examined by optical and scanning electron microscopy because the release of the biological agent depends on the spore distribution in the chitosan beads. The microscopic examination revealed that the beads had a porous surface and contained a network of inner microfibrils. Spores were entrapped in both the chitosan microfibrils and the bead lacuna.

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