Quercetin- and caffeic acid-functionalized chitosan-capped colloidal silver nanoparticles: one-pot synthesis, characterization, and anticancer and antibacterial activities

• Akif Hakan Kurt,
• Elif Berna Olutas,
• Fatma Avcioglu,
• Hamza Karakuş,
• Mehmet Ali Sungur,
• Cansu Kara Oztabag and
• Muhammet Yıldırım

Beilstein J. Nanotechnol. 2023, 14, 362–376, doi:10.3762/bjnano.14.31

• at 433 nm. Distilled water with a quartz cell of 1.0 cm light path was used as a reference for the measurements. Determination of amount of caffeic acid using total phenolic content Standard caffeic acid solutions at concentrations of 50–200 μg/mL were prepared in DMSO. Standard caffeic acid solution

In search of cytotoxic selectivity on cancer cells with biogenically synthesized Ag/AgCl nanoparticles

• Mitzi J. Ramírez-Hernández,
• Mario Valera-Zaragoza,
• Omar Viñas-Bravo,
• Ariana A. Huerta-Heredia,
• Miguel A. Peña-Rico,
• Erick A. Juarez-Arellano,
• David Paniagua-Vega,
• Eduardo Ramírez-Vargas and
• Saúl Sánchez-Valdes

Beilstein J. Nanotechnol. 2022, 13, 1505–1519, doi:10.3762/bjnano.13.124

• amount of phenolic compounds in the pineapple peel extract was quantified. The total phenolic content (TPC) in the pineapple peel extract was 24.66 ± 1.03 mg Catechin/g Ext, and the total flavonoid content (TFC) was 0.62 ± 0.21 mg Rutin/g Ext. The extract has a higher phenolic content in comparison to

• phenolic and flavonoid compounds in the pineapple peel extract was performed before biosynthesis. Total phenolic content was performed using the method described by Singleton et al. [49], and the total flavonoid content was performed according to the method described by Dewanto et al. [50]. The

Scavenging of reactive oxygen species by phenolic compound-modified maghemite nanoparticles

• Małgorzata Świętek,
• Yi-Chin Lu,
• Rafał Konefał,
• Liliana P. Ferreira,
• M. Margarida Cruz,
• Yunn-Hwa Ma and
• Daniel Horák

Beilstein J. Nanotechnol. 2019, 10, 1073–1088, doi:10.3762/bjnano.10.108

• particles. Antioxidant properties of chitosans modified with phenolic compounds The FC assay for colorimetric determination of total phenolic content in samples of natural origin is based on the electron transfer between a phenolic compound and a phosphomolybdic/phosphotungstic complex that emits at a

• sequence: CS-H < CS-P < CS-G (Table 2). The total phenolic content in CS-H reached 5.4 mg/g, which corresponds to 50% of the value achieved for CS-P (10.8 mg/g). Compared to CS-P, the total phenolic content of CS-G increased by another 8 mg/g to 18.8 mg/g in total. According to the DPPH assay, the radical

• using Astra 6.1 software (Wyatt Technology). The antioxidant properties of phenolic compound-modified chitosans were examined by two assays. The first assay was based on a Folin–Ciocalteu (FC) reagent that enables the determination of the total phenolic content, and the second assay analyzed the ability

Voltammetric determination of polyphenolic content in pomegranate juice using a poly(gallic acid)/multiwalled carbon nanotube modified electrode

• Refat Abdel-Hamid and
• Emad F. Newair

Beilstein J. Nanotechnol. 2016, 7, 1104–1112, doi:10.3762/bjnano.7.103

• /MWCNT/GCE) electrochemical sensor was prepared for direct determination of the total phenolic content (TPC) as gallic acid equivalent. The GCE working electrode was electrochemically modified and characterized using scanning electron microscope (SEM), cyclic voltammetry (CV), chronoamperometry and

• concentration throughout the range of 4.97 × 10−6 to 3.38 × 10−5 M with a detection limit of 3.22 × 10−6 M (S/N = 3). The fabricated sensor shows good selectivity, stability, repeatability and (101%) recovery. The sensor was successfully utilized for the determination of total phenolic content in fresh

• ][25][26][27], the objective of present study is to develop a sensitive electrochemical method for the determination of the total phenolic content using poly(gallic acid)/multiwalled carbon nanotube/glassy carbon electrode (PGA/MWCNT/GCE) electrochemical sensor. The polymer may overcome the slow mass