Hybrid Mn-Porphyrin-Nanogold Nanomaterial Applied for the Spectrophotometric Detection ofβ-Carotene

Abstract

A hybrid formed between Mn(III) tetratolyl-porphyrin chloride (MnTTPCl) and spherical gold colloid (n-Au), MnTTPCl/n-Au, was tested along with its component nanomaterials as promising candidates in the detection of β-carotene from ethanol solutions. Among the investigated nanomaterials, the largest β-carotene concentration interval detectable by UV-Vis spectrophotometry (9.80 × 10 −6 M-1.15 × 10 −4 M) was obtained when using the MnTTPCl/n-Au hybrid. is hybrid material gives rise to the widest absorption band, covering the range of 425 nm to 581 nm after treatment with β-carotene.

X-ray Structure Elucidation of a Pt-Metalloporphyrin and Its Application for Obtaining Sensitive AuNPs-Plasmonic Hybrids Capable of Detecting Triiodide Anions

“…Together with our previous application results [24,25,26], these observations stimulated our interest to fully investigate the structure of Pt(II)-5,10,15,20-tetra(4-methoxy-phenyl)-porphyrin (PtTMeOPP) by single crystal X-ray diffraction in order to understand the metal surroundings and the molecule conformation and to assess if it qualifies as a potential sensitive material. The presence of ordered voids in the crystal encouraged us to use PtTMeOPP as the sensing material.…”

“…Other metalloporphyrins, such as (5,10,15,20-tetraphenyl)porphinato manganese(III) chloride, were demonstrated to act as a single mediator for dopamine sensing in the specific case of gold screen-printed electrodes [27]. The gold hybrid of (5,10,15,20-tetratolyl)porphinato manganese(III) chloride was capable of electrochemically detecting ascorbic acid with excellent confidence [28] and optically detecting β-carotene [25]. More complex systems based on gold nanoparticles and porphyrins impregnated in polymers were successfully applied in the electrochemical detection of glucose [29].…”

SYMMETRICAL AND ASYMMETRICAL MESO-SUBSTITUTED PORPHYRINS AND Zn-METALLOPORPHYRINS IN GOLD COLLOID ENVIRONMENT. OPTICAL PROPERTIES AND EVALUATION OF ANTIBACTERIAL ACTIVITY

“…The reference bacterial strains used for the tests were selected such as to include various species: Gram-positive cocci, Gram-negative bacilli, fungi strains and the results are presented in Table II. Taking advantage of the ability of functionalized porphyrin-nano-metal hybrids [31][32][33][34][35][36] to shift the UV-Vis excitation wavelength towards near infrared regions (NIR), the development of these nanocomposites will also be addressed. That is the reason why we prepare our porphyrin solutions into diluted nanogold colloid, although it was proven to be inactive for all the biological performed tests, but the porphyrin-gold hybrid/mixture might offer a better biological activity.…”

“…Porphyrins were obtained in our laboratory as follows: the A3B porphyrins P3, P5, P6 by multicomponent Adler-Longo synthesis [17,26,27]; the symmetrical P1, P2, P4 porphyrins by Adler method [28][29][30] and the 5,10,15,20-tetrakis(pentafluorophenyl)-porphyrinato-Zn(II) (P7) was provided by Merck. The nanogold colloid solution was prepared using a previously published method [31][32][33][34][35][36] having an initial concentration of 4.58 × 10 -4 M and the dilutions were performed according to biological requirements. The following Gram-positive Staphylococcus aureus (ATCC25923), Enterococcus faecalis (ATCC51299), Gram-negative Salmonella enterica typmhimurium (ATCC14028), Shighella flexneri serotype 2b (ATCC 12022), Klebsiella pneumonia (ATCC700603), Pseudomonas aeruginosa (ATCC27853) and Escherichia coli (ATCC25922) bacterial strains and two fungal strains Candida albicans (ATCC10231) and Candida parapsilosis (ATCC 22019) were acquired from Thermo-Scientific.…”

POSS‐based fluorescence sensor for rapid analysis of β‐carotene in health products

“…At this time, the most generally used detection techniques for β-carotene are liquid chromatography combined with mass spectrometry, [7] high-performance liquid chromatography (HPLC), [8] electrochemical methods, [9] and colorimetric methods. [10] The preceding approach is time consuming and necessitates the use of a substantial volume of organic solvent. As a result, a method for determining β-carotene that is simple, quick, sensitive, and selective is very desirable.…”