Preparation of Selenium-rich Tea Set and Its Release Properties of Selenium in Water

Abstract

In view of few systematic studies on selenium-rich ceramics, especially the controllable preparation, analysis, and characterization of selenium-rich ceramics, the release rule of selenium elements is rarely reported in the literature either. Therefore, this paper uses ordinary soil samples as raw materials to simulate the selenium-rich ceramics' synthesis by adding a selenium source to study the selenium content of selenium-rich ceramics and the dissolution law of selenium. With the increase in selenium added, the selenium content in selenium-rich ceramics increased from 13.3 to 112.4 ppm. When selenium pottery was soaked in water, the release amount of selenium was gradually increased with the extension of soaking time. With the increase of sintering temperature, the selenium content in selenium-rich ceramics was decreased from 30.1 to 18.2 ppm, and the selenium release amount was decreased from 0.13 to 0.06 ppm when immersed in water for 48 hours. Therefore, by adding a selenium source, the selenium content in the selenium-rich ceramics can be controlled accurately and the leaching amount of selenium element is balanced and stable over time.

pH-Responsive Intelligent Antibacterial Coatings Based on 2D-COF for Controlled Release of Capsaicin

“…At present, the main methods of intelligently controlling the release of antifouling agents are pH response, enzyme response, and temperature response . Up to now, a variety of nanomaterials with good controlled-release properties have been reported, including poly­(vinyl alcohol) microspheres in a silk sericin-based hydrogel, composite films with an adjustable number of layers using sodium alginate (SA), chitosan (CS), and activated charcoal (AC), microcrystals, polyvinyl alcohol/chitosan microspheres, and a selenium-rich tea set. , Chitosan (CS) has antibacterial properties due to the interaction between its positively charged amino group and the negatively charged cell membrane of bacteria. , The nanocapsules made from CS exhibit typical pH response characteristics due to the large number of amino groups contained in the side chain. , In addition, the intelligent delivery of fungicides can be realized by the modification of chitosan. , Our research group has developed a capsaicin@chitosan (CAP@CS) microcapsule with pH response performance, which can realize the intelligent controlled release of the natural bactericide CAP, which plays an effective sterilization and antifouling role. , However, its dispersion is limited. In order to improve the dispersion on the basis of pH response sterilization, we hope to introduce other materials to further improve the performance of intelligent response controlled release sterilization. , Two-dimensional materials (graphene, covalent organic frameworks) have great potential for marine protective materials, such as corrosion protection and fouling protection, due to their excellent adsorption characteristics, mechanical strength, thermal stability, and other characteristics. , In recent years, 2D covalent organic frameworks (COFs), which are typical representatives of 2D nanomaterials, have the characteristics of diverse synthesis methods, large specific surface area, stable physical and chemical properties, and broad application prospects in different fields. , COF-MOF hybrid materials have ingenious and obvious structural characteristics and excellent performance .…”

“…28 Up to now, a variety of nanomaterials with good controlled-release properties have been reported, including poly(vinyl alcohol) microspheres in a silk sericin-based hydrogel, 29 composite films with an adjustable number of layers using sodium alginate (SA), chitosan (CS), and activated charcoal (AC), 30 microcrystals, 31 polyvinyl alcohol/chitosan microspheres, 32 and a selenium-rich tea set. 33,34 Chitosan (CS) has antibacterial properties due to the interaction between its positively charged amino group and the negatively charged cell membrane of bacteria. 35,36 The nanocapsules made from CS exhibit typical pH response characteristics due to the large number of amino groups contained in the side chain.…”

Catechins and Selenium Species—How They React with Each Other

“…Selenium and green tea, both play an important role in antioxidant defense systems, are particularly interesting as a combination because they have potentially complementary mechanisms of action [32][33][34]. Se-enriched tea, processed from plants grown in seleniferous areas in China, and obtained by using selenium fertilizers has become increasingly popular in recent years due to its more pronounced health-promoting properties [35][36][37].…”