Lipstick can be a confidence booster, enhance a costume and keep lips from chapping. But sharing a tube with a friend or family member can also spread infections. To develop a version with antimicrobial properties, researchers ...
Biochemistry
Dec 16, 2022
0
138
Chemical additives used in plastic production have been found in herring gull eggs, new research shows.
Ecology
Jun 17, 2021
1
145
Some species of marine phytoplankton, such as the prolific bloomer Emiliania huxleyi, can grow without consuming vitamin B1 (thiamine), researchers have discovered. The finding contradicts the common view that E. huxleyi ...
Earth Sciences
Aug 29, 2014
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0
Everyday our cells take in nutrients from food and convert them into the building blocks that make life possible. However, it has been challenging to pinpoint exactly how a single nutrient or vitamin changes gene expression ...
Cell & Microbiology
Feb 13, 2014
1
0
(Phys.org) —A team of researchers at Northwestern University has found that applying antioxidants such as vitamin E to polymers can cause static charge buildup to disperse without an associated shock. In their paper published ...
For more than 40 years, the prevailing explanation of why we get old has been tied to what is called oxidative stress. This theory postulates that when molecules like free radicals, oxygen ions and peroxides build up in cells, ...
Feb 17, 2009
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0
Vitamin E is a strong antioxidant that could act as a sentinel in plants, sending molecular signs from chloroplast, a cell organelle, to the nucleus under extreme environmental conditions. This is among the conclusions of ...
Plants & Animals
Oct 31, 2019
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5
One quick Google search can net hundreds of homemade cat food recipes, but a new study from researchers at the University of California, Davis, finds most are unlikely to provide cats all their essential nutrients. Some recipes ...
Veterinary medicine
May 6, 2019
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7
An antibiotic candidate compound shelved in the 1970s in favour of more promising drugs could be worth a second look, new research has found.
Biochemistry
Dec 14, 2017
0
11
Far from being a food spoiler, the fluorescent lighting in supermarkets actually can boost the nutritional value of fresh spinach, scientists are reporting. The finding could lead to improved ways of preserving and enhancing ...
Biochemistry
Mar 3, 2010
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0
Vitamin E is the collective name for a set of 8 related α-, β-, γ-, and δ-tocopherols and the corresponding four tocotrienols, which are fat-soluble vitamins with antioxidant properties. Of these, α-tocopherol (also written as alpha-tocopherol) has been most studied as it has the highest bioavailability.
It has been claimed that α-tocopherol is the most important lipid-soluble antioxidant, and that it protects cell membranes from oxidation by reacting with lipid radicals produced in the lipid peroxidation chain reaction. This would remove the free radical intermediates and prevent the oxidation reaction from continuing. The oxidised α-tocopheroxyl radicals produced in this process may be recycled back to the active reduced form through reduction by other antioxidants, such as ascorbate, retinol or ubiquinol. However, the importance of the antioxidant properties of this molecule at the concentrations present in the body are not clear and it is possible that the reason why vitamin E is required in the diet is unrelated to its ability to act as an antioxidant.. Other forms of vitamin E have their own unique properties. For example, γ-tocopherol (also written as gamma-tocopherol) is a nucleophile that may react with electrophilic mutagens; and the tocotrienols having specialized roles in protecting neurons from damage, cancer prevention and cholesterol reduction by inhibiting the activity of HMG-CoA reductase[16-1];δ-tocotrienol blocks processing of sterol regulatory element‐binding proteins (SREBPs)[16-1].However, the roles and importance of all of the various forms of vitamin E are presently unclear, and it has even been suggested that the most important function of vitamin E is as a signaling molecule, and that it has no significant role in antioxidant metabolism.
Most studies about vitamin E have supplemented using only the synthetic alpha-tocopherol, but doing so leads to reduced serum gamma- and delta-tocopherol concentrations. Moreover, a 2007 clinical study involving synthetic alpha-tocopherol concluded that supplementation did not reduce the risk of major cardiovascular events in middle aged and older men. For more info, read article tocopherol.
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