Extraction, Physicochemical and Film Properties of Polysaccharides From Highland Barley Bran Fermented by Aureobasidium Pullulans

The research aim was to use orange essential oil and trehalose in a carrageenan matrix to form edible packaging. The edible packaging experimentally produced by casting from an aqueous solution were evaluated by the following analysis: UV-Vis spectrum, transparency value, transmittance, attenuated total reflectance Fourier-Transform spectroscopy (FTIR), scanning electron microscopy (SEM) and antimicrobial activity. The obtained results showed that the combination of orange essential oil with trehalose decreases the transmittance value in the UV and Vis regions (up to 0.14% ± 0.02% at 356 nm), meaning that produced films can act as a UV protector. Most produced films in the research were resistant to Gram-positive bacteria (Staphylococcus aureus subsp. aureus), though most films did not show antibacterial properties against Gram-negative bacteria and yeasts. FTIR and SEM confirmed that both the amount of carrageenan used and the combination with orange essential oil influenced the compatibility of trehalose with the film matrix. The research showed how different combinations of trehalose, orange essential oils and carrageenan can affect edible film properties. These changes represent important information for further research and the possible practical application of these edible matrices.

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Modulating layer-by-layer assembled sodium alginate-chitosan film properties through incorporation of cellulose nanocrystals with different surface charge densities

International Journal of Biological Macromolecules ◽

10.1016/j.ijbiomac.2021.03.092 ◽

2021 ◽

Vol 180 ◽

pp. 510-522

Author(s):

Ruonan Sun ◽

Junxiang Zhu ◽

Hao Wu ◽

Shiqing Wang ◽

Wenxiang Li ◽

...

Keyword(s):

Surface Charge ◽

Sodium Alginate ◽

Cellulose Nanocrystals ◽

Chitosan Film ◽

Layer By Layer ◽

Film Properties ◽

Charge Densities

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Alkali-deficiency driven charged out-of-phase boundaries for giant electromechanical response

Nature Communications ◽

10.1038/s41467-021-23107-x ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Haijun Wu ◽

Shoucong Ning ◽

Moaz Waqar ◽

Huajun Liu ◽

Yang Zhang ◽

...

Keyword(s):

Thin Films ◽

Temperature Stability ◽

Epitaxial Films ◽

Polarization Rotation ◽

Phase Boundaries ◽

Film Properties ◽

New Strategy ◽

The Matrix ◽

Opposing Effects ◽

Severe Deterioration

AbstractTraditional strategies for improving piezoelectric properties have focused on phase boundary engineering through complex chemical alloying and phase control. Although they have been successfully employed in bulk materials, they have not been effective in thin films due to the severe deterioration in epitaxy, which is critical to film properties. Contending with the opposing effects of alloying and epitaxy in thin films has been a long-standing issue. Herein we demonstrate a new strategy in alkali niobate epitaxial films, utilizing alkali vacancies without alloying to form nanopillars enclosed with out-of-phase boundaries that can give rise to a giant electromechanical response. Both atomically resolved polarization mapping and phase field simulations show that the boundaries are strained and charged, manifesting as head-head and tail-tail polarization bound charges. Such charged boundaries produce a giant local depolarization field, which facilitates a steady polarization rotation between the matrix and nanopillars. The local elastic strain and charge manipulation at out-of-phase boundaries, demonstrated here, can be used as an effective pathway to obtain large electromechanical response with good temperature stability in similar perovskite oxides.

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