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Environmental Performance of Bio-Based Polymer Additives: Thermal Stabilizers and Antioxidants
Published in Moayad N. Khalaf, Michael Olegovich Smirnov, Porteen Kannan, A. K. Haghi, Environmental Technology and Engineering Techniques, 2020
Hussein A. Shnawa, Moayad N. Khalaf
Practically, synthetic antioxidants such as butylated hydroxytoluene (BHT) and butylated hydroxyanisole (BHA) are used for stabilization of the polymers, some food products, as well as other hydrocarbons in industrial practice. But about several years ago, some warnings emerged regarding the effects of phenolic antioxidants and their reaction products on human health and on the environmental systems. Recently, polymers synthetic antioxidants and some heavy metal thermal stabilizers have been reported as nonsafe materials for human health. During the storage periods or during the service life, the antioxidants can be extracted or migrated to the food when used for stabilization the polymeric food containers. Generally, most of these warnings have not been solved yet and many attempts has been intensified on the use of some alternative natural antioxidants (from plants) to prevent the side effects of industrial antioxidants, especially for food packaging applications.11,12
Bioproducts Obtained from the Bioprocessing of the Banana Peel Waste: An Overview
Published in A. K. Haghi, Ana Cristina Faria Ribeiro, Lionello Pogliani, Devrim Balköse, Francisco Torrens, Omari V. Mukbaniani, Applied Chemistry and Chemical Engineering, 2017
Sócrates Palacios-Ponce, Anna Ilyina, Rodolfo Ramos-González, Héctor A. Ruiz, José L. Martínez-Hernández, Elda P. Segura-Ceniceros, Miguel A. Aguilar, Olga Sánchez, Cristóbal N. Aguilar
The extracts obtained from green and ripe banana peels (Musa, AAA, cv. Cavendish) using ethyl acetate and water as solvent, showed significant antioxidant activity. Extracts from green peels showed greater activity when compared with yellow peels. On application of the ß-carotene bleaching method, linoleic acid was inhibited by a polar fraction of 70% acetone extracts. Using the ferric thiocyanate method, at a concentration of 0.5 mg/ mL, antioxidant activity was recorded and by the DPPH di ((phenyl)-(2, 4, 6-trinitrophenyl) iminoazanium) radical method, free radical scavenging activity was obtained mainly from the aqueous-acetone extract, followed by the acetone extracts. The antioxidant activity of aqueous extracts was comparable to synthetic antioxidants, such as BHA (butylated hydroxyanisole) and BHT (butylated hydroxytoluene).34
Melt Extruded Amorphous Solid Dispersions
Published in Isaac Ghebre-Sellassie, Charles Martin, Feng Zhang, James DiNunzio, Pharmaceutical Extrusion Technology, 2018
Pinak Khatri, Dipen Desai, Harpreet Sandhu, Atsawin Thongsukmak, Gaurang Patel, Jaydeep Vaghashiya, Wantanee Phuapradit, Navnit Shah
Hindered phenols and aromatic amines are the two major groups of chain-breaking antioxidants that inhibit free radical chain reactions. Commonly used antioxidants such as butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT), and vitamin E are hindered phenols. Because the O-H bonds of phenols and the N-H bonds of aromatic amines are very weak, the rate of oxidation is generally higher with the antioxidant than with the polymer (Crowley et al., 2007).
Cytotoxicity of Sarcosphaera crassa and Tricholoma terreum extracts on colon cancer cell line (HT-29) in conjunction with their antioxidant properties
Published in International Journal of Environmental Health Research, 2022
Oxidation is for the production of energy for all living organisms and for the realization of various biological processes. But also, oxygen-centred free radicals and other reactive oxygen species continuously occuring in vivo cause cell death and tissue damage; this causes various disorders such as diabetes, atherosclerosis, cirrhosis and cancer. Hence, antioxidants (both synthetic/natural) are used to nullify the damage caused by the reactive oxygen and nitrogen species (Khan et al. 2016). Synthetic antioxidants such as butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT), and tert-butylated hydroxyquinine (TBHQ), commonly used in the food industry, have been reported to be carcinogenic; for this reason, the usage of synthetic antioxidants is limited (Botterweck et al. 2000). Thus, the development and utilization of antioxidant substances from natural resources has increased.
Bioactivities and phenolic composition of Limonium boitardii Maire and L. cercinense Brullo & Erben (Plumbaginaceae): two Tunisian strict endemic plants
Published in International Journal of Environmental Health Research, 2022
Ons Sefi, Soumaya Bourgou, Wided Megdiche-Ksouri, Mohamed Libiad, Abdelmajid Khabbach, Mohamed El Haissoufi, Fatima Lamchouri, Nikos Krigas, Zeineb Ghrabi-Gammar
Antioxidants play a crucial effect in reduction of free radicals mediated oxidative stress. The most widely used synthetic antioxidants (butylated hydroxytoluene BHT, butylated hydroxyanisole BHA) are very effective in their role as antioxidants; however, their use has been failing off due to their suspected action as promoters of carcinogenesis. For all these reasons, the study of new sources of natural antioxidants is receiving increasing attention to date. The present study analyzed for the first time the antioxidant properties of ethanol extracts from two local Tunisian endemic Limonium species through DPPH scavenging, total antioxidant activity, and reducing activity assays (Table 1). The two species showed strong and similar antiradical activity scavenging DPPH radical with IC50 values of 27 and 22 µg/mL for L. boitardii and L. cercinense, respectively. Interestingly, L. cercinense presented potent reducing power (CE50 = 93 µg/g DR) and total antioxidant activity (TAA = 136 mg EGA/g DR) which were three and 1.4 times higher than that of L. boitardii. This probably indicates that the two studied Limonium species contain molecules which can act as primary antioxidants, neutralizing free radicals and preventing the initiation and propagation of oxidative chain reactions (Loganayaki and Manian 2010). In accordance with our results, high radical scavenging activity has been previously reported for extracts from Limonium species. A free radical scavenging activity guided fractionation of the polar extract from roots of L. brasiliense Kuntze led to the isolation of five active compounds including myricetin 3-O-α-rhamnoside, epigallocatechin 3-O-gallate, epigallocatechin, gallocatechin and gallic acid (Murray et al. 2004). Myricitrin (myricetin 3-O-α-rhamnoside) is shown to possess a considerable antioxidant activity, with stronger free radical scavenging activity than other flavonol rhamnosides or quercetin (Wu et al. 2008).