China
Africa
Explore chapters and articles related to this topic
Utilization of Fisheries' By-Products for Functional Foods
Published in Se-Kwon Kim, Marine Biochemistry, 2023
Muhamad Darmawan, Nurrahmi Dewi Fajarningsih, Sihono, Hari Eko Irianto
Strong evidence showed that many human diseases such as cancer, cardiovascular, stroke, diabetes, rheumatoid arthritis and dementia are associated with the accumulation of free radicals (Florence, 1995). Antioxidants are molecules that are able to donate an electron to a free radical and neutralize it, hence reducing the free radical damage capacity (Lobo et al., 2010). The potential of fish by-products’ protein hydrolysate as a natural antioxidant has also been highlighted and reported by many studies, such as Lassoued et al. (2015), who reported the high antioxidant activity of the pentapeptides Ala-Val-Gly-Ala-Thr purified from the Raja clavate (thornback ray) skin protease-hydrolyzed FPH. The antioxidant potential of fisheries’ by-product FPH was also reported by other studies, such as by Chi et al. (2015), who purified antioxidant peptides of Phe-Ile-Gly-Pro, Gly-Pro-Gly-Gly-Phe-Ile and Gly-Ser-Gly-Gly-Leu from protein hydrolysates of bluefin leatherjacket (Navodon septentrionalis) heads.
Valorization of Algal Spent Biomass into Valuable Biochemicals and Energy Resource
Published in Sanjeet Mehariya, Shashi Kant Bhatia, Obulisamy Parthiba Karthikeyan, Algal Biorefineries and the Circular Bioeconomy, 2022
Saravanan Vasanthakumar, K Greeshma, Muthu Arumugam
Antioxidant activity is defined as the prevention of oxidation of molecules by inhibiting the formation of non-reactive stable radicals and the initiation step of oxidative chain reaction (Mittal et al., 2014). Nowadays, antioxidants play a vital role in the pharmaceutical and food industry. However, synthetic antioxidants pose danger to human health with their toxic nature. There is a need to discover a new source of natural inhibitors of the oxidation process, without any side effects. Algae are identified as a good source of antioxidant compounds. Fresh seaweed biomass contains glutathione (GSH) and ascorbate (vitamin C). Algae also produce secondary metabolites exhibiting antioxidant activity, for instance, mycosporine-like amino acids (MAA), polyphenols (including catechins, lignans, tannins, flavonoids), phlorotannins, carotenoids, and tocopherol.
Oestradiol, Aging Theory, Women/LGBT Difficulties and Motivation
Published in Debarshi Kar Mahapatra, Cristóbal Noé Aguilar, A. K. Haghi, Natural Products Pharmacology and Phytochemicals for Health Care, 2021
Francisco Torrens, Gloria Castellano
It is healthy and appropriate to obtain a natural diet, rich in antioxidants; but it does not seem reasonable to recommend using commercial preparations in megadosis. Some of the most powerful natural antioxidants are thiols and polyphenols, which make up numerous families (e.g., tannins, flavonoids, carotenoids, lignans, stilbenes), which are abundant in fruits, vegetables, nuts, and seeds. However, the virtues of the natural foods are not only antioxidants, but they are complemented and enhanced by the presence of multivitamins and fiber, which regulate bowel movements and avoid aggressive proportions of fats and refined sugars. Eating them is highly recommended.
Antibiofilm and cytotoxic potential of extracellular biosynthesized gold nanoparticles using actinobacteria Amycolatopsis sp. KMN
Published in Preparative Biochemistry & Biotechnology, 2023
Faezeh Kabiri, Seyyed Soheil Aghaei, Ahmad Ali Pourbabaee, Mohammad Soleimani, Tahereh Komeili Movahhed
An antioxidant is a compound that prevents the biologically relevant molecules from oxidation and protects cells from damaging effects of reactive oxygen species, including superoxide, hydrogen peroxide, hydroxyl radical, or singlet oxygen in a living system. The DPPH free radical scavenging was performed to study the antioxidant action of the biosynthesized AuNPs. DPPH is a steady free nitrogen-centered radical. Its color can alter from purple to pale yellow when decreased by either the hydrogen process or electron donation.[62] Manivasagan et al. have disclosed the potential use of the actinobacterial strain of Nocardiopsis sp. MBRC-48 is an important source for AuNPs with antioxidant activities. The biosynthesized AuNPs were spherical in shape with an average size of 11.57 ± 1.24 nm.[63] According to the results, the biosynthesized AuNPs could transfer hydrogen or electron to the free radical (DPPH) and change it to the steady DPPH-H. The result is appreciable when compared with that of other research.[64]
Synthesis, structures, antioxidant, and antifungal activities of organotin(IV) complexes derived from 1-(3′-carboxyphenylhydrazono)naphthalene-2-one
Published in Journal of Coordination Chemistry, 2022
Pratima Debnath, Paresh Debnath, Th. Sonia Devi, S. Suresh Kumar Singh, Arnab Bhattacharya, Keisham Surjit Singh, Manojit Roy, Tarun Kumar Misra
Compounds having antioxidant properties are always in demand. They have been used to destroy free radicals that may damage a person’s DNA and cell membranes. The antioxidants have added beneficial effects such as slowing aging, decreasing chances of heart diseases, improving vision, and curbing cancer. These are also used as food additives to increase shelf-life of products. Unlike the reported dibutyltin(IV) system [35], the antioxidant activities of these compounds were thus investigated. The DPPH scavenging assay for the synthesized compounds were examined. The result of the DPPH-scavenging properties of 1 in three different solvents (DMSO, ethanol, and methanol), 2 and 3 in DMSO, and two standard antioxidant compounds are shown in Supplementary Table S1. Figure 6 displays the data projected in the bar diagram. The results for 2 were excluded from the table because it exhibited no noteworthy antioxidant activity. However, 1 has the highest level of antioxidant activity in ethanol (45.64%), followed by DMSO (40.1%), while 3 has the lowest level of antioxidant activity (29.33%) in DMSO. The reason of high antioxidant activity of methyltin(IV) derivative is unclear and it cannot be inferred from the literature [51] either. The outcomes are quite less than those of the standard antioxidants, gallic acid (67.79%) and ascorbic acid (62.77%). Even though antioxidant activity of 1 is not very impressive when compared to the standards, but it has somewhat antioxidant properties and can be treated as a potential antioxidant.
Isolation, structure characterization and prediction of antioxidant activity of two new compounds from the leaves of Dodonaea viscosa native to the Sultanate of Oman
Published in Egyptian Journal of Basic and Applied Sciences, 2018
Asila Ahmed Salim Al Habsi, Mohammad Amzad Hossain
Plants are considered as essential source of medicines for humans. Plant parts like leaves, flowers, roots, stems, seeds, and fruit are used as food resources for human as well as safe medicine for the treatment of different diseases. Plant-derived herbal medicine is used as main sources for the treatment of diseases since the ancient time [1]. Antioxidants are the most important chemical components that may prevent or delay different types of cell damage. Foods, fruits, and vegetables are the main sources of natural antioxidants. The prevention or recovery of cell damage in the human body could be used foods, fruits, and vegetables as natural antioxidants. The main mechanism of antioxidants is to improve the immune system in the human body by producing the free radical. Some of natural antioxidants are also available as dietary supplements. Recently, vegetables and fruits are considered as rich sources of natural antioxidants. Several recent scientific evidences are available that eating lots of vegetables and fruits are very good sources for human health and to prevent the cell damage. Therefore, the risks of certain chronic or incurable diseases are lowered due to natural antioxidants [2].