Nanolayered composite with enhanced ultraviolet ray absorption properties from simultaneous intercalation of sunscreen molecules

Abstract

IntroductionThe potential of layered double hydroxide (LDH) as a host of multiple ultraviolet-ray absorbers was investigated by simultaneous intercalation of benzophenone 4 (B4) and Eusolex® 232 (EUS) in Zn/Al LDH.MethodsThe nanocomposites were prepared via coprecipitation method at various molar ratios of B4 and EUS.ResultsAt equal molar ratios, the obtained nanocomposite showed an intercalation selectivity that is preferential to EUS. However, the selectivity ratio of intercalated anions was shown to be capable of being altered by adjusting the molar ratio of intended guests during synthesis. Dual-guest nanocomposite synthesized with B4:EUS molar ratio 3:1 (ZEB [3:1]) showed an intercalation selectivity ratio of B4:EUS =53:47. Properties of ZEB (3:1) were monitored using powder X-ray diffractometer to show a basal spacing of 21.8 Å. Direct-injection mass spectra, Fourier transform infrared spectra, and ultraviolet–visible spectra confirmed the dual intercalation of both anions into the interlayer regions of dual-guest nanocomposite. The cytotoxicity study of dual-guest nanocomposite ZEB (3:1) on human dermal fibroblast cells showed no significant toxicity until 25 μg/mL.ConclusionOverall, the findings demonstrate successful customization of ultraviolet-ray absorbers composition in LDH host.

Polymer/Iron-Based Layered Double Hydroxides as Multifunctional Wound Dressings

“…By increasing material concentration from 0.781 to 50 µg mL −1 , a reduction of about 20% in the cell viability of both materials is noted. Mohsin et al [59] evaluated the cytotoxicity of the Zn/Al LDH intercalated with NO 3 − anions and with a mixture of two ultraviolet-ray absorbers benzophenone 4 and Eusolex ® 232, applying dermal fibroblast cells. Pristine and hybrid LDHs do not present significant toxicity up to 25 µg mL −1 , however, cell viabilities decreased for about 50% by doubling materials concentration.…”

Dual-Functional Iron Oxide Nanoparticles Coated with Polyvinyl Alcohol/5-Fluorouracil/Zinc-Aluminium-Layered Double Hydroxide for a Simultaneous Drug and Target Delivery System

“…Moreover, the peak at 1228 cm −1 indicated the stretching vibration for the N−H bond. In the case of samples containing nitrate, the band at around 1384 cm −1 is ascribed to the asymmetric stretching vibration (v3) of nitrate ions [28]. The obvious presence of this band revealed a nitrate substitution in the structure.…”

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

“…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.…”