Layered double hydroxides: An advanced encapsulation and delivery system for cosmetic ingredients-an overview

Pillai, Sreejarani Kesavan; Kleyi, Phumelele; Beer, Marinda De; Mudaly, Preensha

doi:10.1016/j.clay.2020.105868

Cited by 36 publications

(15 citation statements)

References 74 publications

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“…LHs and LDHs are composed of positively charged inorganic layers ( Figure 1 ), and the counter anion can be replaced by various AIs for various purposes as shown in Figure 2 . These include nanopesticides for plant protection [ 29 ], drug delivery [ 30 ] and gene delivery [ 31 ], sunscreen protection [ 32 ], catalysis [ 33 ] and environmental remediation, [ 34 ], supercapacitors [ 35 ], cosmetics [ 36 ], etc. If drugs or therapeutic agents are intercalated into the interlayers, various nanodrugs [ 37 ], or nanotherapeutic delivery systems can be generated which are useful for anticancer purposes [ 38 ], anti-TB purposes [ 39 ], etc.…”

Section: Layered Hydroxidesmentioning

confidence: 99%

A Review on Nanopesticides for Plant Protection Synthesized Using the Supramolecular Chemistry of Layered Hydroxide Hosts

Zobir

Ali

Adzmi

et al. 2021

Biology

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The rapid growth in the human population has triggered increased demand for food supply, and in turn has prompted a higher amount of agrochemical usage to meet the gaps between food production and consumption. The problem with conventional agro-nanochemicals is the reduced effectiveness of the active ingredient in reaching the target, along with leaching, evaporation, etc., which ultimately affect the environment and life, including humans. Fortunately, nanotechnology platforms offer a new life for conventional pesticides, which improves bioavailability through different kinetics, mechanisms and pathways on their target organisms, thus enabling them to suitably bypass biological and other unwanted resistances and therefore increase their efficacy. This review is intended to serve the scientific community for research, development and innovation (RDI) purposes, by providing an overview on the current status of the host–guest supramolecular chemistry of nanopesticides, focusing on only the two-dimensional (2D), brucite-like inorganic layered hydroxides, layered hydroxide salts and layered double hydroxides as the functional nanocarriers or as the hosts in smart nanodelivery systems of pesticides for plant protection. Zinc layered hydroxides and zinc/aluminum-layered double hydroxides were found to be the most popular choices of hosts, presumably due to their relative ease to prepare and cheap cost. Other hosts including Mg/Al-, Co/Cr-, Mg/Fe-, Mg/Al/Fe-, Zn/Cr- and Zn/Cu-LDHs were also used. This review also covers various pesticides which were used as the guest active agents using supramolecular host–guest chemistry to combat various pests for plant protection. This looks towards a new generation of agrochemicals, “agro-nanochemicals”, which are more effective, and friendly to life, humans and the environment.

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Section: Layered Hydroxidesmentioning

confidence: 99%

A Review on Nanopesticides for Plant Protection Synthesized Using the Supramolecular Chemistry of Layered Hydroxide Hosts

Zobir

Ali

Adzmi

et al. 2021

Biology

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“…They are currently attracting more technological interest due to their outstanding properties such as facile synthesis, unique structure, unvarying distribution of diverse metal cations in the brucite layer, surface hydroxyl groups, high tunability, intercalated anions with interlamellar spaces, excellent chemical stability, and the ability to intercalate diverse varieties of anions (inorganic, organic, biomolecules, and even genes) [ 3 ]. Due to its tunability, LDH is acclaimed in a variety of technological applications such as photoluminescence [ 4 ], sensors [ 5 ], drug delivery [ 6 ], cosmetics [ 7 ], antimicrobial materials [ 8 ], catalysts [ 9 ], and supercapacitors [ 10 ]. However, LDH is more applied for energy storage applications because of the synergistic effects of two or more metals involved during its preparation resulting in higher theoretical specific capacitance compared to single counterparts [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Investigating the Impact of the Washing Steps of Layered Double Hydroxides (LDH) on the Electrochemical Performance

et al. 2022

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The washing of layered double hydroxides (LDH) material is mostly purposed to discard the unreacted products after the reaction has been completed. However, this study demonstrated that the washing stage can also be targeted to optimise the electrochemical performance of LDH by using an appropriate solvent. Solvents, namely, ethanol, acetone, and an ethanol–acetone solution (2:1) were used for the washing of LDH and the impacts thereof on the structural, physical, chemical, morphological, and electrochemical properties were investigated. Using Williamson–Hall analysis, we observed modifications on the crystalline domain. The specific surface area and pore parameters for all the samples were also differently affected. The Fourier transform infrared (FTIR) measurements displayed evident changes in the basic sites. The electrochemical performances of samples were analysed. The sample washed with the ethanol–acetone solution exhibited a specific capacitance of 1807.26 Fg−1 at 10 mVs−1, which is higher than that of other samples as well as low internal resistance compared to its counterpart. This demonstrates that the use of an appropriate solvent during the washing stage of LDH affects the electrochemical properties.

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“…Since ancient times, mankind has widely used decorative cosmetics. The composition of these products includes various components, but pigments are the obligatory and most important of them [1,2]. These pigments can be obtained both from natural sources and synthetically.…”

Section: Introductionmentioning

confidence: 99%

Determination of the dependence of the structure of Zn-Al layered double hydroxides, as a matrix for functional anions intercalation, on synthesis conditions

Кovalenko

Borysenko

Kotok

et al. 2022

EEJET

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Layered double hydroxides, especially Zn-Al, are valuable matrices for intercalation with various functional anions: dyes, medicines, food additives, etc. For the purposeful development and optimization of the technology for the synthesis of Zn-Al hydroxides intercalated with functional anions, the phase composition and crystal structure of Zn-Al nitrate layered double hydroxide samples (Zn:Al=4:1) synthesized at solution flow rates of 0.8 and 1.6 l/h, pH=7, 8, 9, 10 and t=10, 20, 30, 40, 50 and 60 °С were studied. XRD showed that all samples synthesized at different temperatures, pH, and solution flow rates were Zn-Al layered double hydroxides with an α-Zn(OH)2 crystal lattice of medium crystallinity, with an admixture of an oxide phase with a ZnO lattice. Three sections of the dependence of the crystallite size of the sample on the synthesis temperature were distinguished: 10–20 °C, 30–50 °C, and 60 °C, within which an increase in temperature led to an increase in crystallinity. A hypothesis was put forward about a change in the mechanism or kinetics of LDH formation at temperatures of 30 °C and 60 °C. An increase in the pH of the synthesis and the flow rate of solutions led to an increase in crystallinity. A retrospective comparative analysis of the phase composition and crystal structure of Zn-Al-nitrate and Zn-Al-tripolyphosphate (tartrazine or Orange Yellow S) LDH samples was carried out. It was found that the use of large and multi-charged functional anions caused significant adsorption on precipitate nuclei and difficult intercalation. As a result, low crystallinity was formed (Tartrazine anion) or a significant part of LDH was decomposed to oxide (tripolyphosphate and Orange Yellow S anions).

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Layered double hydroxides: An advanced encapsulation and delivery system for cosmetic ingredients-an overview

Cited by 36 publications

References 74 publications

A Review on Nanopesticides for Plant Protection Synthesized Using the Supramolecular Chemistry of Layered Hydroxide Hosts

A Review on Nanopesticides for Plant Protection Synthesized Using the Supramolecular Chemistry of Layered Hydroxide Hosts

Investigating the Impact of the Washing Steps of Layered Double Hydroxides (LDH) on the Electrochemical Performance

Determination of the dependence of the structure of Zn-Al layered double hydroxides, as a matrix for functional anions intercalation, on synthesis conditions

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