Quantitative Analysis of Nanoparticles Release

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Materials Processes".

Deadline for manuscript submissions: closed (31 October 2021) | Viewed by 2465

Special Issue Editor


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Guest Editor
Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet 115, 2800 Kgs. Lyngby, Denmark
Interests: nano-enabled products; nanosafety; characterization

Special Issue Information

Dear Colleagues,

Engineered nanomaterials are increasingly being used for a wide range of applications, including industrial catalysts, medical products, cosmetics, consumer products, and food packaging. During the past two decades, substantial effort has been put into developing methods and improving analytical instrumentation for nanomaterial characterization, which has facilitated a better understanding of nanomaterial release and transformation through various stages of their life cycle. Proper quantification and characterization of nanomaterial release and, consequently, possible nanoexposure is of utmost importance to gain a better understanding of nanomaterial safety for both environment and consumers.

In this Special Issue, we invite submissions exploring nanomaterial release from various products/items through various stages of their life cycle, focusing on quantification of nanomaterial release, as well as submissions discussing the regulatory relevance of nanomaterial characterization and state-of-the-art methods. Contributions can be submitted as research papers, short communications, or reviews.

Dr. Aiga Mackevica
Guest Editor

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Keywords

  • nanomaterials
  • nano-enabled products
  • characterization methods
  • nanomaterial release

Published Papers (1 paper)

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Research

12 pages, 3035 KiB  
Article
Low Molecular Weight Kappa-Carrageenan Based Microspheres for Enhancing Stability and Bioavailability of Tea Polyphenols
by Tao Feng, Kai Wu, Jianying Xu, Zhongshan Hu and Xiaolei Zhang
Processes 2021, 9(7), 1240; https://doi.org/10.3390/pr9071240 - 18 Jul 2021
Cited by 5 | Viewed by 2026
Abstract
Tea polyphenols (TP) are a widely acknowledged bioactive natural product, however, low stability and bioavailability have restricted their application in many fields. To enhance the stability and bioavailability of TP under certain moderate conditions, encapsulation technique was applied. Kappa–Carrageenan (KCG) was initially degraded [...] Read more.
Tea polyphenols (TP) are a widely acknowledged bioactive natural product, however, low stability and bioavailability have restricted their application in many fields. To enhance the stability and bioavailability of TP under certain moderate conditions, encapsulation technique was applied. Kappa–Carrageenan (KCG) was initially degraded to a lower molecular weight KCG (LKCG) by H2O2, and was selected as wall material to coat TP. The obtained LKCG (Mn = 13,009.5) revealed narrow dispersed fragments (DPI = 1.14). FTIR and NMR results demonstrated that the main chemical structure of KCG remained unchanged after degradation. Subsequently, LK-CG and TP were mixed and homogenized to form LK-CG-TP microspheres. SEM images of the microspheres revealed a regular spherical shape and smooth surface with a mean diameter of 5–10 μM. TG and DSC analysis indicated that LK-CG-TP microspheres exhibited better thermal stability as compared to free TP. The release profile of LK-CG-TP in simulated gastric fluid (SGF) showed a slowly release capacity during the tested 180 min with the final release rate of 88.1% after digestion. Furthermore, in vitro DPPH radical scavenging experiments revealed that LK-CG-TP had an enhanced DPPH scavenging rate as compared to equal concentration of free TP. These results indicated that LK-CG-TP microspheres were feasible for protection and delivery of TP and might have extensive potential applications in other bioactive components. Full article
(This article belongs to the Special Issue Quantitative Analysis of Nanoparticles Release)
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