Morphology and Release Profile of Microcapsules Encapsulated Alpha-Pinene by Complex Coacervation

The chitosan-gum arabic microcapsules prepared by complex coacervation were chosen as carrier for a model insect semiochemicals, α-pinene, owing non-toxicity of the polymers and mild conditions of the method. The coated colloids were characterized using scanning electron microscopy (SEM). The release of α-pinene from microspheres was studied in simulated conditions. The results showed that α-pinene-loaded microspheres which were obtained by association had a mean diameter of 5±0.5µm. The encapsulation efficiency and the encapsulation yield of the α-pinene-loaded microspheres were about 51.70±2.5% and 42.11±2.3%, respectively. The release experiments revealed that polyelectrolytes prolonged the release time of the encapsulated α-pinene. The release rate of α-pinene from the microspheres was proportional to the release time.

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Morphology, Stability, and Application of Lycopene Microcapsules Produced by Complex Coacervation

Journal of Chemistry ◽

10.1155/2013/982603 ◽

2013 ◽

Vol 2013 ◽

pp. 1-7 ◽

Cited By ~ 23

Author(s):

Glaucia A. Rocha-Selmi ◽

Carmen S. Favaro-Trindade ◽

Carlos R. F. Grosso

Keyword(s):

Encapsulation Efficiency ◽

Gum Arabic ◽

Average Diameter ◽

Stability Test ◽

Free Form ◽

Complex Coacervation ◽

The Stability ◽

Processing And Storage ◽

High Degree ◽

And Storage

The interest in lycopene has increased in recent years due to studies that associate it with the reduction in risk of developing cardiovascular diseases and cancer. However, due to its high degree of unsaturation, this carotenoid is inclined to isomerize and oxidize during processing and storage, making it difficult to use in the food industry. Microencapsulation can improve this situation, increasing its stability and making incorporation into food formulations possible. Thus, the aim of this study was to microencapsulate lycopene by complex coacervation using gelatin and gum Arabic as the encapsulating agents. The microcapsules were evaluated based on the encapsulation efficiency and their morphology and then submitted to a stability test and applied in cake making. Most of the systems studied presented spherical microcapsules with defined walls. The encapsulation efficiency values were above 90%, and the average diameter of the capsules ranged from 61 to 144 μm. The stability test showed that microencapsulation offered greater protection to the lycopene as compared to its free form. The application of nonfreeze dried coacervated microcapsules in cake making was satisfactory, but the color transference was low when freezedried coacervated microcapsules were used.

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ELECTROSPUN CHITOSAN/PVA NANOFIBERS FOR DRUG DELIVERY

Vietnam Journal of Science and Technology ◽

10.15625/2525-2518/54/4b/12040 ◽

2018 ◽

Vol 54 (4B) ◽

pp. 185 ◽

Cited By ~ 2

Author(s):

Doan Van Hong Thien

Keyword(s):

Drug Delivery ◽

Electron Microscope ◽

Encapsulation Efficiency ◽

Release Profile ◽

Poly Vinyl Alcohol ◽

Electrospinning Technique ◽

Molecular Weights ◽

Electrospinning Method ◽

Surface Morphologies ◽

Scanning Electron

Electrospinning technique is a versatile method to fabricate continuous fibers with diameters ranging from a few micrometers to a few nanometers. In this study, chitosan/ poly (vinyl alcohol) (PVA) nanofibers were fabricated by an electrospinning method. The effects of chitosan molecular weights and ratio of chitosan/PVA were studied. The characteristics and surface morphologies of nanofibers were observed by the Scanning Electron Microscope (SEM). The diameters of nanofibers were in the range of 100 nm to 250 nm. The chitosan/PVA nanofibers with different molecular weights were applied for curcumin delivery. Curcumin was loaded in the chitosan/PVA nanofibers. Then, release profile of curcumin was investigated. In the results, the encapsulation efficiency and the release rate demonstrate that chitosan/PVA nanofibers would be potential carriers for curcumin and promise to create a prospective drug delivery in the field of medicine.

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

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.477-478.1229 ◽

2013 ◽

Vol 477-478 ◽

pp. 1229-1233 ◽

Cited By ~ 2

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.

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Development, characterization and viability study of probiotic microcapsules produced by complex coacervation followed by freeze-drying

Ciência Rural ◽

10.1590/0103-8478cr20180775 ◽

2019 ◽

Vol 49 (7) ◽

Cited By ~ 1

Author(s):

Thaiane Marques da Silva ◽

Juliano Smanioto Barin ◽

Eduardo Jacob Lopes ◽

Alexandre José Cichoski ◽

Erico Marlon de Moraes Flores ◽

...

Keyword(s):

Lactobacillus Acidophilus ◽

Encapsulation Efficiency ◽

Freeze Drying ◽

Gum Arabic ◽

Significant Protection ◽

Complex Coacervation ◽

Gastrointestinal Conditions ◽

Viability Study ◽

Different Temperatures ◽

And Storage

ABSTRACT: Technique of complex coacervation was used to produce microcapsules of Lactobacillus acidophilus La-5 encapsulated in gelatin and gum arabic which were then freeze-drying. Microcapsules were characterized using scanning electron and optical microscopy, and resistance of probiotics was evaluated during release into a simulated gastrointestinal tract and storage at different temperatures. The complex coacervation process produced microcapsules with a high encapsulation efficiency (77.60% and 87.53%), ranging from 127.14-227.05 μm with uniform distribution. Microencapsulation was an efficient approach to achieve significant protection of probiotics against simulated gastrointestinal conditions compared with free cells. Encapsulation also improved the viability of probiotics during storage at either −18 ºC for 120 days, 7 ºC for 105 days or 25 ºC for 45 days. Therefore, complex coacervation was demonstrated to be adequate and promising for encapsulation of probiotics.

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Microencapsulation of Zataria multiflora Boiss. essential oil by complex coacervation using gelatin and gum Arabic: characterization, release profile, antimicrobial and antioxidant activity

Journal of Food Processing and Preservation ◽

10.1111/jfpp.15823 ◽

2021 ◽

Author(s):

Seyed Amin Khatibi ◽

Ali Ehsani ◽

Mahboob Nemati ◽

Afshin Javadi

Keyword(s):

Antioxidant Activity ◽

Essential Oil ◽

Gum Arabic ◽

Release Profile ◽

Complex Coacervation ◽

Zataria Multiflora ◽

Antimicrobial And Antioxidant Activity

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Histochemical and morphological features of biopsied and stripped oocytes from the Brazilian endangered teleost pirapitinga, Brycon nattereri (Characiformes)

Zygote ◽

10.1017/s0967199413000646 ◽

2014 ◽

Vol 23 (3) ◽

pp. 360-366 ◽

Cited By ~ 3

Author(s):

Alexandre N. Maria ◽

Laura H. Orfão ◽

Elizete Rizzo ◽

Alexandre Ninhaus-Silveira ◽

Ana T.M. Viveiros

Keyword(s):

Pituitary Extract ◽

Follicular Cells ◽

Animal Pole ◽

Essential Information ◽

Zona Radiata ◽

Oocyte Morphology ◽

Acidic Polysaccharides ◽

Mean Diameter ◽

Pore Canals ◽

Scanning Electron

SummaryThe aim of the present study was to characterize biopsied and stripped oocytes from the Brazilian endangered teleost pirapitinga (Brycon nattereri) using histochemical and morphological analyses. Biopsied oocytes had a mean diameter of 2.225 mm (modal diameter: 2.312 mm), complete vitellogenesis and a central or slightly eccentric nucleus. Neutral polysaccharides were detected in the follicular cells, zona radiata and yolk globules, while acidic polysaccharides were detected in the follicular cells and cortical alveoli. Ten out of the 19 females treated with two doses of carp pituitary extract (cPE) released oocytes, which were also analysed. Stripping occurred 292 ± 39 degree-hours after the second dose of cPE and led to a mean spawning weight of 36.2 g, 10% spawning index, 241 oocytes/g of ova, 8222 oocytes/female and 23 oocytes/g of body weight. Stripped oocytes had a mean diameter of 2.33 mm and a mode at 2.375 mm, were weakly adhesive and coloration ranged from wine to brown. Under scanning electron microscopy, stripped oocytes exhibited a single funnel-shaped micropyle located at the animal pole and a zona radiata that measured 7.7 μm in thickness with eight pore canals/μm2. Oocyte morphology in Brycon nattereri is similar to that found in other species of the genus, except for the larger size and weaker adhesiveness. These findings provide essential information for a better understanding of the reproductive biology of B. nattereri and the establishment of conservation measures for this threatened species.

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