scholarly journals Influence of TiO2Nanoparticles on Growth and Phenolic Compounds Production in Photosynthetic Microorganisms

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Mattia Comotto ◽  
Alessandro Alberto Casazza ◽  
Bahar Aliakbarian ◽  
Valentina Caratto ◽  
Maurizio Ferretti ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Phenolic Compounds ◽  
Haematococcus Pluvialis ◽  
Titanium Dioxide Nanoparticles ◽  
Arthrospira Platensis ◽  
Significant Inhibition ◽  
Antioxidant Compounds ◽  
Significant Difference ◽  
Photosynthetic Microorganisms ◽  
Significant Growth Inhibition

The influence of titanium dioxide nanoparticles (pure anatase and 15% N doped anatase) on the growth ofChlorella vulgaris,Haematococcus pluvialis, andArthrospira platensiswas investigated. Results showed that pure anatase can lead to a significant growth inhibition ofC. vulgarisandA. platensis(17.0 and 74.1%, resp.), while forH. pluvialisthe nanoparticles do not cause a significant inhibition. Since in these stress conditions photosynthetic microorganisms can produce antioxidant compounds in order to prevent cell damages, we evaluated the polyphenols content either inside the cells or released in the medium. Although results did not show a significant difference inC. vulgaris, the phenolic concentrations of two other microorganisms were statistically affected by the presence of titanium dioxide. In particular, 15% N doped anatase resulted in a higher production of extracellular antioxidant compounds, reaching the concentration of 65.2 and68.0 mg gDB-1forH. pluvialisandA. platensis, respectively.

Titanium Dioxide Nanoparticles and Cetylpyridinium Chloride Enriched Glass-Ionomer Restorative Cement: A Comparative Study Assessing Compressive Strength and Antibacterial Activity

2019 ◽  
Vol 43 (1) ◽  
pp. 42-45
Author(s):  
Nida Hamid ◽  
Ravishankar Lingesha Telgi ◽  
Amit Tirth ◽  
Vaibhav Tandon ◽  
Smita Chandra ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Antibacterial Activity ◽  
Titanium Dioxide ◽  
Tio2 Nanoparticles ◽  
Titanium Dioxide Nanoparticles ◽  
Cetylpyridinium Chloride ◽  
Testing Machine ◽  
Glass Ionomer Cement ◽  
Glass Ionomer ◽  
Significant Difference

Objective: To evaluate the addition of titanium dioxide (TiO2) nanoparticles and cetylpyridinium chloride (CPC) on the compressive strength and antibacterial activity of conventional glass-ionomer cement (GIC). Study design: TiO2 nanoparticles enriched GIC was prepared by adding 3% TiO2 nanoparticles (w/w) into the powder component of conventional GIC. CPC containing GIC was developed by incorporating 1% CPC (w/w) into conventional GIC powder. Samples were segregated into three groups: GIC with 3% TiO2 nanoparticles, GIC with 1% CPC and unmodified conventional GIC. Compressive strength was assessed using the universal testing machine on cylindrical specimens made from each material. Antibacterial activity was assessed by measuring inhibition zones on Mitis Salivarius Bacitracin (MSB) agar inoculated with pure strain of Streptococcus mutans (S. mutans). Results: GIC containing TiO2 nanoparticles exhibited significantly greater compressive strength as compared with CPC and conventional GIC groups (P < 0.01). However, there was no significant difference between the compressive strengths of CPC and conventional GIC group (P >0.05). Antibacterial activity was significantly greater for TiO2 group than conventional GIC (P <0.05). CPC increased the antibacterial activity of conventional GIC, though not significantly. Conclusion: The addition of 3% TiO2 nanoparticles improves the compressive strength of GIC as well as its antibacterial activity against S. mutans.

scholarly journals Features of Surface Structures of Alumina and Titanium Dioxide Nanoparticles Produced Using Different Synthesis Methods

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Vyacheslav Syzrantsev ◽  
Evgenii Paukshtis ◽  
Tatyana Larina ◽  
Yuriy Chesalov ◽  
Sergey Bardakhanov ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Surface Properties ◽  
Titanium Dioxide Nanoparticles ◽  
Energy Shift ◽  
Synthesis Methods ◽  
Diffuse Reflection Spectroscopy ◽  
X Ray Diffraction ◽  
Significant Difference ◽  
Luminescence Characteristics ◽  
Comprehensive Study

A comparative study of the scope and surface properties of alumina (Al2O3) and titanium dioxide (TiO2) nanoparticles, synthesized using different methods, was carried out using Fourier-transform infrared spectroscopy (FTIR), ultraviolet UV-Vis diffuse reflection spectroscopy (UV-Vis DRS), and Raman spectroscopy, as well as X-ray diffraction methods. It is shown that the differences in the synthesis methods can change the surface properties of the nanoparticles, while maintaining the phase composition of the material. The nanoparticles of each material are shown to exhibit unexpected properties. In particular, the special luminescence characteristics of TiO2, a photon-energy shift from the rutile region into that region typical for the anatase, and a significant difference in the Lewis center concentration values for the alumina γ-phase were observed. This variation in the properties indicates the necessity to involve a wider range of analysis techniques and the importance of precisely characterizing the surface properties. To identify those nanoparticle functional properties that determine their interactions with other materials, a comprehensive study of their phase compositions and surface properties must be completed.

scholarly journals Blackberry (Rubus spp.): influence of ripening and processing on levels of phenolic compounds and antioxidant activity of the 'Brazos' and 'Tupy' varieties grown in Brazil

2015 ◽  
Vol 45 (4) ◽  
pp. 744-749 ◽  
Author(s):  
Acácio Antonio Ferreira Zielinski ◽  
Caroline Goltz ◽  
Maira Akemi Casagrande Yamato ◽  
Suelen Ávila ◽  
Elisa Yoko Hirooka ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Phenolic Compounds ◽  
Total Phenolic ◽  
Antioxidant Compounds ◽  
Anthocyanin Content ◽  
Antioxidant Power ◽  
Significant Difference ◽  
Ferric Reducing Antioxidant Power ◽  
Fermented Beverage ◽  
Tropical Climates

Fruits from temperate and tropical climates which have high levels of antioxidant compounds are the source of numerous studies concerning the correlation with benefits to human health. The objectives of this study were to quantify the anthocyanins and phenolic compounds and also to measure the antioxidant activity (ferric reducing antioxidant power - FRAP) of blackberries from two varieties grown in southern Brazil ('Brazos' and 'Tupy') at three stages of ripening; unripe, semi-ripe, ripe and their products (pulp and fermented products). During fruit ripening it was observed that weight, size, diameter and sugars increase significantly and acidity decreased significantly. The anthocyanin content ranged from 4.19 (semi-ripe 'Tupy' variety) to 205.75mg 100g-1 (ripe 'Brazos' variety). The highest levels of phenolic compounds were observed for the unripe fruit of both varieties, while antioxidant activity showed no significant difference during the ripening stages. The studied pulp showed a high content of phenolic compounds (ten times higher than that found in the ripe fruits). The anthocyanin content and antioxidant activity did not show the same increase due to the degradation of anthocyanins caused by the heat treatment that was used. The alcoholic fermented beverage made from blackberries remained stable (total phenolic compounds and antioxidant activity) during two years of storage, but the in third year a significant reduction in antioxidant activity was observed. These results can be important for establishing the shelf life of this kind of product made with blackberry

scholarly journals Titanium Implants Coated with a Bifunctional Molecule with Antimicrobic Activity: A Rabbit Study

Materials ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 3613 ◽  
Author(s):  
Antonio Scarano ◽  
Francesco Carinci ◽  
Tiziana Orsini ◽  
Luca Valbonetti ◽  
Erda Qorri ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Titanium Implants ◽  
P Value ◽  
Implant Surface ◽  
Bone Implant ◽  
Bifunctional Molecule ◽  
Significant Difference ◽  
Bone Implant Contact ◽  
Antimicrobic Activity

Background: Various surface treatments have been tested for titanium implants aiming at increasing their surface biocompatibility and their biological characteristics, but also the efficiency of the implant surface will have to be improved to drastically decrease peri-implantite and mucosite. In fact, the peri-implantitis and peri-implant mucositis have a high incidence in clinical practice. The nanofabrication techniques that offer the possibility to achieve the implant surface that reduces bacterial colonization could influence the osteointegration. The aim of this research was to evaluate the bone response to titanium implants coated with a bifunctional molecule with antimicrobic activity consisting of a combination of silver ions covalently bound to titanium dioxide nanoparticles. Methods: A total of 36 implants were inserted into 18 older New Zealand white male rabbits. They had two different surfaces. The implants Control group was characterized by an acid-etched and sandblasted surface treatment, and the Test implants had an acid-etched and sandblasted surface coated with a silver ion covalently bound to titanium dioxide nanoparticles in the solution. Results: No statistically significant difference of the bone density was evidenced between Control and Test implants at two weeks (p-value = 0.623), four weeks (p-value = 0.339), and eight weeks (p-value = 0.461). Moreover, no statistically significant difference of the bone-implant contact percentage was evidenced between Control and Test implants at two weeks (p-value = 0.938), four weeks (p-value = 0.307), and eight weeks (p-value = 0.294). The effectiveness of the present investigation demonstrated no adverse effects on osseointegration, and no statistically significant differences were observed in the bone density and percentage of bone-implant contact between Test and Control implants at all the experimental time points (two, four, and eight weeks). Conclusions: Titanium implants coated with the silver-anatase solution bind very well to the bone and did not have an adverse effect on the bone tissue in a rabbit model. These facts suggest possible clinical applications for the silver composition.

Effect of titanium dioxide nanoparticles administered during pregnancy on depression-like behavior in forced swimming and tail suspension tests in offspring mice

2020 ◽  
Vol 36 (4) ◽  
pp. 297-304
Author(s):  
Mitra Tarlan ◽  
Javad Sajedianfard ◽  
Mazyar Fathi
Keyword(s):  
Titanium Dioxide ◽  
Second Generation ◽  
Titanium Dioxide Nanoparticles ◽  
Forced Swim Test ◽  
Study Groups ◽  
Forced Swimming ◽  
Engineered Nanoparticles ◽  
Tail Suspension ◽  
Immobility Time ◽  
Significant Difference

Introduction: Applications of engineered nanoparticles are rapidly increasing. Titanium dioxide nanoparticles (TiO2 NPs) are used in many products including those produced by pigment and cosmetic manufacturers. The objective of this study was to investigate the effects of maternal exposure during pregnancy to TiO2 NPs on depressive-like behavior in the first and second generation offspring. Materials and Methods: Forty female albino mice were placed into four groups for 2 weeks. Fertile males were then added to each cage by a ratio of two males to five females. After detection of pregnancy, the mice were transferred to separate cages. The study groups were divided into four groups: the first group, served as control, did not receive any treatment; the second group received injections of normal saline; groups 3 and 4 received, respectively, 50 and 100 µl of TiO2 NP solution injections subcutaneously on days 3, 7, 10, and 14 after mating. Behavioral tests were conducted on postnatal days 21 and 40. Findings: Subcutaneous injection of 50 and 100 µl of TiO2 NPs significantly ( p < 0.05) increased the immobility time in the forced swimming test and tail suspension test (TST). No significant difference was observed in measured variables between groups receiving 50 and 100 µl of TiO2 NPs. No significant difference was also found between male and female offspring. Depression-like behavior increased in the second generation of mice in the forced swim test and TST. Conclusion: Prenatal exposure of mothers to TiO2 NPs would increase depression-like behavior in neonatal mice.

scholarly journals Using C-doped TiO2 Nanoparticles as a Novel Sonosensitizer for Cancer Treatment

Antioxidants ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 880 ◽  
Author(s):  
Chun-Chen Yang ◽  
Chong-Xuan Wang ◽  
Che-Yung Kuan ◽  
Chih-Ying Chi ◽  
Ching-Yun Chen ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Tumor Cells ◽  
Titanium Dioxide Nanoparticles ◽  
Sol Gel ◽  
Inorganic Materials ◽  
Sonodynamic Therapy ◽  
Carbon Doped ◽  
Significant Difference ◽  
Doped Titanium Dioxide

Sonodynamic therapy is an effective treatment for eliminating tumor cells by irradiating sonosentitizer in a patient’s body with higher penetration ultrasound and inducing the free radicals. Titanium dioxide has attracted the most attention due to its properties among many nanosensitizers. Hence, in this study, carbon doped titanium dioxide, one of inorganic materials, is applied to avoid the foregoing, and furthermore, carbon doped titanium dioxide is used to generate ROS under ultrasound irradiation to eliminate tumor cells. Spherical carbon doped titanium dioxide nanoparticles are synthesized by the sol-gel process. The forming of C-Ti-O bond may also induce defects in lattice which would be beneficial for the phenomenon of sonoluminescence to improve the effectiveness of sonodynamic therapy. By dint of DCFDA, WST-1, LDH and the Live/Dead test, carbon doped titanium dioxide nanoparticles are shown to be a biocompatible material which may induce ROS radicals to suppress the proliferation of 4T1 breast cancer cells under ultrasound treatment. From in vivo study, carbon doped titanium dioxide nanoparticles activated by ultrasound may inhibit the growth of the 4T1 tumor, and it showed a significant difference between sonodynamic therapy (SDT) and the other groups on the seventh day of the treatment.

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