Electrochemical study of bovine serum albumin damage induced by Fenton reaction using tris (2,2′-bipyridyl) cobalt (III) perchlorate as the electroactive indicator

An electrochemical biosensor for rapid detection of bovine serum albumin damage induced by hydroxyl radicals in room temperature ionic liquid

Protections of bovine serum albumin protein from damage on functionalized graphene-based electrodes by flavonoids

A novel electrochemical biosensor for monitoring protein nitration damage affected by NaNO2/hemin/H2O2

An electrochemical biosensor for analysis of Fenton-mediated oxidative damage to BSA using poly-o-phenylenediamine as electroactive probe

This underutilized variety of Dolichos lablab bean seed serves as a good source of natural antioxidants, which may be effective in reducing the risk of occurrence of certain diseases. This study was undertaken for the first time to address the limited knowledge regarding the, antioxidant activities, DNA damage inhibitory activity, bovine serum albumin (BSA) damage inhibitory activity, anti‐acetylcholinesterase, and anti‐porcine α–amylase in the lablab bean seed. The antioxidant capacity of lablab bean seeds were evaluated for their potential antioxidant activities using the ferric‐reducing/antioxidant power assay (FRAP), free radical‐scavenging activity (DPPH), nitric oxide (NO) radical‐scavenging assay, and 2,20‐azinobis(3‐ethylbenzothiazoline‐6‐sulfonic acid (ABTS). The lablab bean extract exhibited good antioxidant activity by effectively scavenging FRAP, DPPH, NO, and ABTS radicals. Additionally, excellent protective effects against BSA damage, as well as natural α‐amylase inhibitors were also shown. The bean extract had protective effects against DNA damage. The lablab bean may have a future role as an ingredient in the development of functional foods

Oxidative damage of bovine serum albumin and other enzyme proteins by iron-chelate complexes

In this study, the interaction of chitosan (CS) coated CS-Fe3O4@ZnS:Mn magnetic-fluorescent nanoparticles (MFNPs) with bovine serum albumin (BSA) was studied by means of ultraviolet–visible and fluorescence spectra; evidences for the damage of BSA molecule in the presence of CS-Fe3O4@ZnS:Mn MFNPs under UV illumination were also obtained. The results show that the dominating fluorescence quenching mechanism of CS-Fe3O4@ZnS:Mn MFNPs with BSA belongs to static quenching. Fluorescence resonance energy transfer (FRET) occurred from BSA to CS-Fe3O4@ZnS:Mn MFNPs. The thermodynamic parameters indicated that electrostatic interaction play major roles in CS-Fe3O4@ZnS:Mn-BSA, while binding processes exist spontaneously. In addition, the damage of CS-Fe3O4@ZnS:Mn MFNPs to BSA molecule under UV illumination was studied under various experimental parameters. It was proved that: the damage of BSA is prone to happen in the presence of CS-Fe3O4@ZnS:Mn MFNPs under UV illumination, there is synergic effect of oxygen and UV illumination on the damage of BSA, and the fluorescence quenching of BSA by CS-Fe3O4@ZnS:Mn MFNPs under UV illumination is mainly a result of a photo-induced free radical procedure.

Sonocatalytic damage of bovine serum albumin (BSA) in the presence of nanometer anatase titanium dioxide (TiO 2)

Taking bovine serum albumin (BSA) as typical molecules, the sonodynamic damage of protein in the presence of Levofloxacin (LVFX) and its mechanism were studied by fluorescence and UV-vis spectra. Various influencing factors such as ultrasonic irradiation time, pH value, ionic strength and solution temperature on the damage of BSA were also discussed. The results showed that ultrasound can enhance the damage of LVFX on BSA. The damage degree of BSA was aggravated with the increase of ultrasonic irradiation time, solution temperature and ionic strength, whereas decreased with the increase of solution pH value. Furthermore, the reactive oxygen species (ROS) in reaction system were studied by oxidation and extraction photometry. Experimental results showed that the amounts of superoxide anion radical (·O(2)(-)) and hydroxyl radical (·OH) were significantly more than that of singlet oxygen ((1)O(2)) in the presence of LVFX under ultrasonic irradiation.

Spectroscopic investigation on the sonodynamic activity of amsacrine (AMSA) to bovine serum albumin (BSA) damage

A decoloration/recoloration cycling-associated photo-stimulated fuel cell to assess potential health risks caused by TiO2 nanoparticles and tris(hydroxymethyl)aminomethane

BACKGROUND: In order to effectively degrade bovine serum albumin (BSA) under ultrasonic irradiation, biological mineral material (tooth powder) was adopted to mix with nano-sized TiO2 powder. A TiO2/tooth composite with high sonocatalytic activity and remarkable selectivity was prepared. RESULTS: TiO2/tooth composite with tooth content of 30% (w/w) heat-treated at 500 °C for 40 min was used as sonocatalyst and the catalytic degradation of BSA under ultrasonic irradiation was examined. Some influencing factors, such as ultrasonic irradiation time, TiO2/tooth catalyst amount, solution acidity and NaCl concentration, were studied by UV-vis and fluorescence spectroscopic analysis. Furthermore, the BSA attack site for the TiO2/tooth composite was identifies by synchronous fluorescence spectra. CONCLUSION: The results indicated that, under ultrasonic irradiation, the TiO2/tooth composite can promote the degradation of BSA more effectively than pure nano-sized TiO2 powder. The attack site is identified as tyrosine (Tyr) residue. These results are of great significance for the use of a sonocatalytic method to treat tumours in clinical applications. Copyright © 2011 Society of Chemical Industry

Sonodynamic therapy (SDT) is an innovative cancer treatment involving a tumor-localizing sonosensitizer. The synthesis, modification and activity of novel sonosensitizers have attracted more and more researchers’ attention. In the present study, chlorophyll-magnesium (Chl-Mg) and metronidazole (MTZ) were used as reactants and the chlorophyll-magnesium linked metronidazole complex (chlorophyll-magnesium-metronidazole, Chl-Mg-MTZ) was synthesized and characterized. Bovine serum albumin (BSA) was selected as the target protein; the biomolecule affinity and sonodynamic activity of Chl-Mg-MTZ were assessed by their UV–vis and fluorescence spectra. The results indicate that the interaction of Chl-Mg-MTZ to BSA is comparable with that of chlorophyll-magnesium (Chl-Mg). However, during damage of BSA, Chl-Mg-MTZ shows a higher sonodynamic activity than chlorophyll-magnesium (Chl-Mg). Moreover, synchronous fluorescence spectroscopy indicates that Chl-Mg-MTZ has similar binding ability with the tyrosine (Tyr) and tryptophan (Trp) residues of BSA molecules. However, the damage is mainly focused on the Trp residues. In addition, the production of reactive oxygen species (ROS) in the sonodynamic process was detected through the oxidation-extraction of 1,5-diphenylcarbazide (DPCI). The results promote the potential of Chl-Mg-MTZ as a new sonosensitive drug for use in SDT, encouraging further study on tumor treatment.

ZnO/Dens composite were prepared with nano-sized ZnO and porcine dens powders by mechanical mixing, liquid boiling, ultrasonic dispersion and heat-treated at 500°C for 50 min. The samples were characterized by X-ray diffraction (XRD) and its sonocatalytic activity was evaluated by the damage of bovine serum albumin (BSA). Furthermore, the effects of ultrasonic irradiation time, ZnO/Dens composite amount, solution acidity and ionic strength on the sonocatalytic damage of BSA were evaluated. The results show that the damage degree of BSA aggravated with the increase of ultrasonic irradiation time, ZnO/Dens composite amount and ionic strength, but weakened with the increase of solution acidity. In addition, the damage site to BSA molecules was analyzed by synchronous fluorescence spectra and the results exhibited that the damage site was mainly at tryptophan (Trp) residue. This study should be helpful to drive sonocatalytic method to treat tumors in clinic application.

Spectroscopic study on the sonodynamic and sonocatalytic damage of anthraquinone derivants to bovine serum albumin under ultrasonic irradiation