Influence of the freezing and lyophilization of bacterial cellulose hydrogel on water removal from both water-in-oil and oil-in-water emulsion

Wang, Mengling; Li, Zhaoqian; Chen, An; Tian, Qiang; Liu, Xun; Luo, Qing; Pei, Chonghua

doi:10.1007/s10570-022-04642-2

Cited by 4 publications

(1 citation statement)

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“…Lyophilization was shown to be a useful technique for the formation of cellulose aerogels from hydrogels [32]. It was shown to induce a microstructure with useful properties for advanced applications, such as water removal from waste emulsions, where the aerogel is actually re-introduced into a liquid environment [34,35].…”

Section: Introductionmentioning

confidence: 99%

Lyophilized Emulsions of Thymol and Eugenol Essential Oils Encapsulated in Cellulose

Shlosman,

Rein,

Shemesh

et al. 2024

Polymers

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Efforts to tap into the broad antimicrobial, insecticidal, and antioxidant activities of essential oils (EOs) are limited due to their strong odor and susceptibility to light and oxidation. Encapsulation of EOs and subsequent drying overcome these limitations and extend their applications. This study characterized freeze-dried (lyophilized) emulsions of eugenol (EU) and thymol (TY) EOs, encapsulated by chemically unmodified cellulose, a sustainable and low-cost resource. High-resolution scanning electron microscopy showed successful lyophilization. While the observed “flake-like” structure of the powders differed significantly from that of the emulsified microcapsules, useful properties were retained. Fourier transform infrared spectroscopy confirmed the presence of EOs in their corresponding powders and thermo-gravimetric analysis demonstrated high encapsulation efficiency (87–88%), improved thermal stability and resistance to evaporation, and slow EO release rates in comparison to their free forms. The lightweight and low-cost cellulose encapsulation, together with the results showing retained properties of the dried powder, enable the use of EOs in applications requiring high temperatures, such as EO incorporation into polymer films, that can be used to protect agricultural crops from microbial infections.

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Section: Introductionmentioning

confidence: 99%