free radicals
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2023 ◽  
Vol 83 ◽  
Author(s):  
E. Ibáñez-Arancibia ◽  
J. G. Farías ◽  
I. Valdebenito

Abstract The cold storage of milt implies potentials alterations in its quality because the storage generates as main process, free radicals that produce spermatozoa membrane lipids damage with the consequent motility and fertilising capacity disruptions. To decrease the damage generated by free radicals the cells have antioxidant defences (proteins, enzymes, and low molecular weight substances). The objective of the present study evaluated the time storage effect and different antioxidants prepared in spermatic diluents on sperm viability of O. mykiss milt stored at 4°C. The two-way ANOVA denoted that the time storage and antioxidant influence have significant effects separated or combined on viability parameters (sperm motility and viability, proteins concentrations and superoxide dismutase enzymatic activity in seminal plasma). In contrast, only the storage time affected the fertilising capacity and catalase enzymatic activity in seminal plasma. The resulting analysis can conclude that the antioxidant presence improves the viability of cold stored milt, especially the transport conditions and the antioxidants allow the fecundity despite motility decrease.


2022 ◽  
Vol 10 (1) ◽  
pp. 28-33
Author(s):  
M. Ranggawati ◽  
I. I. Arief ◽  
Z. Wulandari

Whey produced from cheese processing can be used as non-food products such as sunscreen by fermenting using Streptococcus thermophilus and Lactobacillus bulgaricus. Adding active ingredients such as red fruit oil which contains carotenoids can increase the effectiveness of sunscreen. This study aims to determine the formulation of fermented whey and red fruit oil usage in sunscreen. The study began with the production of fermented whey and sunscreen formulations with ratios of 0, 1:1, 1:2, and 2:1 (fermented whey: red fruit oil). Furthermore, observe the organoleptic, antioxidant, SPF, pH, and homogeneity value. Adding fermented whey and red fruit oil showed no significant effect (P>0.05) onthe organoleptic test of aroma, but significantly (P<0.05) on color and texture. The antioxidant activity value test showed significantly different results (P<0.05) with IC50 values classified as moderate to high.Determination of the SPF value of sunscreen showed significantly different results  (P<0.05), but this value was classified as low protection. Although there was no significant effect on pH testing (P>0.05), the pH of sunscreen cream indicated that it was suitable for topical application. All samples showed homogeneous results and there were no coarse particles or separation between the oil and water phases. The best sunscreen formulation is 1:1 cream with the highest SPF value of 6.86 and strong antioxidant activity with an IC50 value of 56.15 g/mL. Fermented whey and red fruit oil usage as active ingredients are more effective in increasing the protection of the cream against UV rays and free radicals.


Fermentation ◽  
2022 ◽  
Vol 8 (1) ◽  
pp. 35
Author(s):  
Elizaveta Timkina ◽  
Lucie Drábová ◽  
Andrea Palyzová ◽  
Tomáš Řezanka ◽  
Olga Maťátková ◽  
...  

Members of the genus Kocuria are often found in soils contaminated with toxic metals or exposed to high levels of ionizing radiation. The use of classical cultivation technics often leads to the isolation of Kocuria sp. from underground spring waters. These bacterial isolates have to adapt their metabolism to survive in such extreme environments. Four bacterial isolates of the genus Kocuria (Kocuria sp. 101, 208, 301, and 401) were obtained from radon spring water (Jachymov, Czech Republic). These isolates were tested for their ability to withstand stress and extreme conditions. Growth was observed at a temperature range of 10–45 °C with optimal growth temperature between 20 and 30 °C. The content of polyunsaturated fatty acids in all four isolates was proved to be temperature-dependent. The strain Kocuria sp. 301 showed high resistance to all studied extreme conditions (UV radiation, desiccation, and free radicals in medium). The results suggest that isolates from radioactive springs might have developed mechanisms that help them survive under several extreme conditions and could be used in biotechnological production.


Nanomaterials ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 237
Author(s):  
Zhenyao Han ◽  
Hiromi Kurokawa ◽  
Hirofumi Matsui ◽  
Chunlin He ◽  
Kaituo Wang ◽  
...  

In this study, 8% hydrogen (H2) in argon (Ar) and carbon dioxide (CO2) gas nanobubbles was produced at 10, 30, and 50 vol.% of ethanol aqueous solution by the high-speed agitation method with gas. They became stable for a long period (for instance, 20 days), having a high negative zeta potential (−40 to −50 mV) at alkaline near pH 9, especially for 10 vol.% of ethanol aqueous solution. The extended Derjaguin, Landau, Verwey, and Overbeek (DLVO) theory was used to evaluate the nanobubble stability. When the nanobubble in ethanol alkaline aqueous solution changed to an acidic pH of around 5, the zeta potential of nanobubbles was almost zero and the decrease in the number of nanobubbles was identified by the particle trajectory method (Nano site). The collapsed nanobubbles at zero charge were detected thanks to the presence of few free radicals using G-CYPMPO spin trap reagent in electron spin resonance (ESR) spectroscopy. The free radicals produced were superoxide anions at collapsed 8%H2 in Ar nanobubbles and hydroxyl radicals at collapsed CO2 nanobubbles. On the other hand, the collapse of mixed CO2 and H2 in Ar nanobubble showed no free radicals. The possible presence of long-term stable nanobubbles and the absence of free radicals for mixed H2 and CO2 nanobubble would be useful to understand the beverage quality.


Antioxidants ◽  
2022 ◽  
Vol 11 (1) ◽  
pp. 146
Author(s):  
Ryszard Pluta ◽  
Jacek Kiś ◽  
Sławomir Januszewski ◽  
Mirosław Jabłoński ◽  
Stanisław J. Czuczwar

Recent years have seen remarkable progress in research into free radicals oxidative stress, particularly in the context of post-ischemic recirculation brain injury. Oxidative stress in post-ischemic tissues violates the integrity of the genome, causing DNA damage, death of neuronal, glial and vascular cells, and impaired neurological outcome after brain ischemia. Indeed, it is now known that DNA damage and repair play a key role in post-stroke white and gray matter remodeling, and restoring the integrity of the blood-brain barrier. This review will present one of the newly characterized mechanisms that emerged with genomic and proteomic development that led to brain ischemia to a new level of post-ischemic neuropathological mechanisms, such as the presence of amyloid plaques and the development of neurofibrillary tangles, which further exacerbate oxidative stress. Finally, we hypothesize that modified amyloid and the tau protein, along with the oxidative stress generated, are new key elements in the vicious circle important in the development of post-ischemic neurodegeneration in a type of Alzheimer’s disease proteinopathy.


2022 ◽  
Vol 29 (1) ◽  
Author(s):  
Ilham Saptia Nugraha ◽  
Dimas Sindhu Wibisono ◽  
Indah Saraswati ◽  
Achmad Zulfa Juniarto

Objective: Excessive use of MSG in everyday life can cause infertility to men. Exposure to MSG can cause cells to experience oxidative stress which subsequently triggers the generation of free radicals. Free radicals can be resisted with antioxidants. Material & Methods: This research was a laboratory experimental test with a post-test only control group design using male mice as the experimental object. The statistical test used the One Way ANOVA test. Results: In this research, 5 male mice were assigned into 4 groups and 1 control group. Using the One Way ANOVA test, it was found that there were significant differences in ≥ 2 treatment groups in the motility group of spermatozoa with active movement (p < 0.001) and the motility group of spermatozoa with weak movement (p = 0.036). The two groups showed significant differences. The Post hoc LSD test in the motility group with active movement showed significant differences between the control group with MSG treatment (p < 0.001) and the treatment group given Moringa leaves extract of 600 mg/kgW (p < 0.001) and 1200 mg/kgW (p < 0.001). Conclusion: Moringa leaves extract can effect the improvement of the motility of spermatozoa exposed to monosodium glutamate at a given dose of 300 mg/kgW and 600 mg/kgW.


Nanomaterials ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 209
Author(s):  
Aiqing Ma ◽  
Hui Ran ◽  
Jiaxing Wang ◽  
Rui Ding ◽  
Chengyu Lu ◽  
...  

Sonodynamic therapy (SDT), as a novel cancer therapy strategy, might be a promising approach due to the depth-penetration property in tissue. Sonosensitizers are the key element for efficient SDT. However, the development of sonosensitizers with strong sonosensitization efficacy is still a significant challenge. Herein, an urchin-shaped copper-based metalloporphyrin liposome nanosystem (FA–L–CuPP) is constructed and identified as an excellent sonosensitizer. Under ultrasound (US) irradiation, FA–L–CuPP can be highly excited to generate several reactive oxygen species (ROS), such as singlet oxygen (1O2) and free radicals (⋅OH). The molecular orbital distribution calculations reveal that a strong intramolecular charge transfer might occur in the CuPP complex under US irradiation, which could afford enough energy to the surrounding O2 and H2O to concert 1O2, O2− and ⋅OH. Working as “ammunitions”, the largely produced ROS can kill 4T1 tumor cells, effectively inhibiting tumor growth. This work provides an urchin-shaped nanosonosensitizer based on a copper complex, which might provide an idea to design a novel sonosensitizer for noninvasive and precise SDT antitumor applications.


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