Nano-structure and properties of maize zein studied by atomic force microscopy

Guo, Yang; Liu, Zhongdong; An, Hongjie; Li, Minqian; Hu, Jun

doi:10.1016/j.jcs.2004.12.005

Cited by 113 publications

(66 citation statements)

References 23 publications

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“…By comparing elongation of Schiff bases films at constant temperature, it was indicated that elongation percentages of CA and DMABA based films at 60°C (2 h) reached ∼237.7 and 259.2 %, respectively, while it reached ∼263.7 % for BA. These mechanical properties of Schiff bases of zein films can be explained on the basis that structure of zein consists of a meshwork composed of doughnut structures formed by asymmetric rods joined to each other via hydrophobic interactions that subsequently maintain film integrity, while intensive hydrophobic interactions can be also responsible for the brittleness and lack of flexibility in zein films (Guo et al 2005). On the other side, lutein (natural pigment) had an obvious role in maintaining the helical structure of zein polypeptides and subsequently affect formation of zein assemblies (Anderson and Lamsal 2011).…”

Section: Tensile Strength (Ts) and Elongation (E)mentioning

confidence: 99%

Synthesis, characterization and antibacterial activity of biodegradable films prepared from Schiff bases of zein

Soliman¹,

Khalil

Deraz

et al. 2012

J Food Sci Technol

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Pure zein is known to be very hydrophobic, but is still inappropriate for coating and film applications because of their brittle nature. In an attempt to improve the flexibility and the antimicrobial activity of these coatings and films, Chemical modification of zein through forming Schiff bases with different phenolic aldhydes was tried. Influence of this modifications on mechanical, topographical, wetting properties and antimicrobial activity of zein films were evaluated. The chemical structure of the Schiff bases films were characterized by ATR-FTIR spectroscopy. The results indicate an improvement in mechanical properties with chemically modification of zein to form Schiff bases leading to a reduction in the elastic modulus. An increase in the elongation at break has been observed, but with slight influence on tensile strength. Plasticized zein films have similar initial contact angle (∼40°). An increase in reaction temperature and time increases film's affinity towards water. As shown by contact angle measurements, a noticeable relation was found between film composition and the hydrophilicity. Surface topography also varied by forming Schiff bases, becoming rougher than zein-based films. The antibacterial activities of zein and Schiff bases of zein-based films were investigated against grampositive bacteria (Listeria innocua, Listeria monocytogenes, Bacillus cereus and Clostridium sporogenes) and gramnegative bacteria (Escherichia coli, Yersinia enterocolitica and Salmonella enterica). It was found that the antibacterial activity of the Schiff bases-based films was more effective than that of zein-based films.

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Section: Tensile Strength (Ts) and Elongation (E)mentioning

confidence: 99%

Synthesis, characterization and antibacterial activity of biodegradable films prepared from Schiff bases of zein

Soliman¹,

Khalil

Deraz

et al. 2012

J Food Sci Technol

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“…However, most of these methods produce particles with wide size distribution. Many of the studies reported in the literature used yellow zein which produced larger particles, particle aggregation, and lower drug encapsulation (19,(22)(23)(24). Patel et al (25) used casein as a stabilizer to prevent the aggregation of nanoparticles prepared with yellow zein.…”

Section: Introductionmentioning

confidence: 99%

Influence of Formulation Factors on the Preparation of Zein Nanoparticles

2012

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Abstract. The main objective of the present study was to investigate the influence of various formulation parameters on the preparation of zein nanoparticles. 6,7-dihydroxycoumarin (DHC) was used as a model hydrophobic compound. The influence of pH of the aqueous phase, buffer type, ionic strength, surfactant, and zein concentration on particle size, polydispersity index, and zeta potential of DHC-loaded zein nanoparticles were studied. Smaller nanoparticles were formed when the pH was close to the isoelectric point of zein. DHC-loaded zein nanoparticles prepared using citrate buffer (pH 7.4) was better than phosphate buffer in preventing particle aggregation during lyophilization. The ionic strength did not have a significant influence on the particle size of DHC-loaded zein nanoparticles. A combination of Pluronic F68 and lecithin in 2:1 ratio stabilized the zein nanoparticles. An increase in zein concentration led to increase in particle size of DHC-loaded zein nanoparticles. The use of optimal conditions produced DHCloaded nanoparticles of 256±30 nm and an encapsulation efficiency of 78±7%. Overall, the study demonstrated the optimal conditions to prepare zein nanoparticles for drug encapsulation.

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“…Small zein particles are easily merged with each other to form a filamentous structure. 34 Therefore, the globules and filaments were generated at different CO 2 flow rates.…”

mentioning

confidence: 99%

Preparation of zein nanoparticles by using solution-enhanced dispersion with supercritical CO<sub>2</sub> and elucidation with computational fluid dynamics

Li¹,

Zhao²

2017

IJN

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Nanoparticles have attracted more and more attention in the medicinal field. Zein is a biomacromolecule and can be used as a carrier for delivering active ingredients to prepare controlled release drugs. In this article, we presented the preparation of zein nanoparticles by solution-enhanced dispersion by supercritical CO 2 (SEDS) approach. Scanning electron microscopy and transmission electron microscopy were applied to characterize the size and morphology of the obtained particles. The nozzle structure and the CO 2 flow rate greatly affected the morphology and the size of the particles. The size of zein was able to be reduced to 50–350 nm according to the different conditions. The morphologies of the resultant zein were either sphere or the filament network consisted of nanoparticles. The influence of the nozzle structure and the CO 2 flow rate on the velocity field was elucidated by using computational fluid dynamics. The nozzle structure and the CO 2 flow rate greatly affected the distribution of the velocity field. However, a similar velocity field could also be obtained when the nozzle structure or the CO 2 flow rate, or both were different. Therefore, the influence of the nozzle structure and the CO 2 flow rate on the size and morphology of the particles, can boil down to the velocity field. The results demonstrated that the velocity field can be a potential criterion for producing nanoparticles with controllable morphology and size, which is useful to scale-up the SEDS process.

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Nano-structure and properties of maize zein studied by atomic force microscopy

Cited by 113 publications

References 23 publications

Synthesis, characterization and antibacterial activity of biodegradable films prepared from Schiff bases of zein

Synthesis, characterization and antibacterial activity of biodegradable films prepared from Schiff bases of zein

Influence of Formulation Factors on the Preparation of Zein Nanoparticles

Preparation of zein nanoparticles by using solution-enhanced dispersion with supercritical CO<sub>2</sub> and elucidation with computational fluid dynamics

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