differences found in antioxidant activities of astaxanthin isomers against singlet oxygen
(A) Structures of stereoisomers of astaxanthin. (B) Measurement of the singlet oxygen quenching capacity of antioxidants. Credit: Zheng Xinxin

Recently, researchers led by Prof. Huang Qing from Institute of Intelligent Machines, Hefei Institutes of Physical Science (HFIPS) of Chinese Academy of Sciences (CAS) suggested a new method to evaluate the antioxidant activity of astaxanthin isomers against singlet oxygen.

The results were published in Food Chemistry.

Astaxanthin has excellent antioxidant properties and is widely used in food supplements. It has many isomers and their physical and chemical properties are also different. The team has been carrying out work on the source of astaxanthin, properties and functions for years. In this study, they tried a spectroscopic method to investigate the antioxidant activity of isomers of astaxanthin against singlet oxygen (1O2). Singlet oxygen is a kind of reactive oxygen species (ROS) with long life and strong oxidation capacity. In the past, studies on the antioxidant activity of astaxanthin did not specifically distinguish the active oxygen species and generally ignored the difference in antioxidant activity of astaxanthin’s isomers.

Based on previous research, scientists used methylene blue (MB) as a photosensitizer to generate 1O2, and used probe 1, 3-diphenyliso-benzofuran (DPBF) to detect 1O2 in the solution. The singlet oxygen quenching capacities of astaxanthin isomers were evaluated by comparing the absorption changes of DPBF at 410 nm under different astaxanthin treatment, and the quenching constants of astaxanthin isomers were compared with that of vitamin E.

The study found that the singlet oxygen quenching constant of astaxanthin was three orders of magnitude different from that of vitamin E. The 1O2 quenching capacities of the optical isomers of astaxanthin are almost identical in extracellular experiments. For the cis-trans geometric isomers of astaxanthin, the 1O2 quenching capacity of cis-astaxanthin was significantly higher than that of all-trans astaxanthin.

It offered a simple and facile spectroscopic method to assess the antioxidant activity of different forms of astaxanthin against singlet oxygen and reveals significant differences between geometric isomers, which provided a new basis for the practical application of astaxanthin in the food industry and the development of future biological functions. More information: Xinxin Zheng et al, Assessment of the antioxidant activities of representative optical and geometric isomers of astaxanthin against singlet oxygen in solution by a spectroscopic approach, Food Chemistry (2022). DOI: 10.1016/j.foodchem.2022.133584 Journal information: Food Chemistry

Provided by Hefei Institutes of Physical Science, Chinese Academy of Sciences Citation: Differences found in antioxidant activities of astaxanthin isomers against singlet oxygen (2022, August 16) retrieved 16 August 2022 from https://phys.org/news/2022-08-differences-antioxidant-astaxanthin-isomers-singlet.html This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

TECH NEWS RELATED

3M hopes its new powder can help unlock green hydrogen production

3M senior research scientist Andy Steinbach held a catalyst powder that promises to unlock lower-cost green hydrogen production. Credit: 3M A material 3M has been working on for decades could be key to unlocking cost-effective production of green hydrogen, a promising but expensive renewable fuel source. The product—3M nanostructured-supported ...

View more: 3M hopes its new powder can help unlock green hydrogen production

Europe can rapidly eliminate imports of Russian natural gas, say researchers

Credit: Pixabay/CC0 Public Domain Using a new power sector model, a team of researchers, including faculty at Binghamton University, State University of New York, has proposed a method for Europe to eliminate natural gas imports from Russia. The team’s commentary article, “Europe’s way out: Tools to rapidly eliminate imports ...

View more: Europe can rapidly eliminate imports of Russian natural gas, say researchers

Judge says Twitter-Musk trial still on track

Neither Twitter nor Elon Musk have asked the court to put the case on hold, so the judge ruled she would ‘continue to press on toward our trial’ The judge presiding over Twitter’s legal battle to hold Elon Musk to his $44-billion buyout deal said Wednesday the case was ...

View more: Judge says Twitter-Musk trial still on track

Climate change made summer drought 20 times more likely

Credit: Pixabay/CC0 Public Domain Drought that stretched across three continents this summer—drying out large parts of Europe, the United States and China—was made 20 times more likely by climate change, according to a new study. Drought dried up major rivers, destroyed crops, sparked wildfire, threatened aquatic species and led ...

View more: Climate change made summer drought 20 times more likely

Study: Removing GRE requirement does not undermine student success

Credit: Unsplash/CC0 Public Domain In 2019, Boston University School of Public Health (BUSPH) eliminated the Graduate Record Examination as a requirement for admission to the school’s graduate programs for a pilot period of three years. The school’s decision was fueled by a growing body of data that indicated that ...

View more: Study: Removing GRE requirement does not undermine student success

Earth System Grid Federation launches effort to upgrade climate projection data system

A simulation of the planet from the DOE Energy Exascale Earth System Model, one of the large-scale models incorporated in the Earth System Grid Federation led by DOE’s Oak Ridge, Argonne and Lawrence Livermore national laboratories. Credit: LLNL, U.S. Dept. of Energy The Earth System Grid Federation, a multi-agency ...

View more: Earth System Grid Federation launches effort to upgrade climate projection data system

Some everyday materials have memories, and now they can be erased

In this study, the research team tracked the locations of 25,000 tiny particles that make up a two-dimensional disordered solid. Groups of particles rearrange as the solid is deformed. This diagram depicts when particles are rearranged as the material is deformed in one direction (left) or the opposite direction ...

View more: Some everyday materials have memories, and now they can be erased

Shocking Study Finds Decreased Proteins – Not Amyloid Plaques – Cause Alzheimer’s Disease

The prevailing theory is that Alzheimer’s disease is caused by the buildup of amyloid plaques in the brain. However, new research finds that it is actually caused by a decline in levels of a specific protein. New research on patients with mutations published in the Journal of Alzheimer’s Disease. ...

View more: Shocking Study Finds Decreased Proteins – Not Amyloid Plaques – Cause Alzheimer’s Disease

Logging down the value chain raises future forest sustainability concerns

SpaceX capsule heads to space station ferrying NASA crew and Russian

Documentary featuring Professor Sara Seager wins Emmy Award

Petting Dogs Engages the Social Brain, According to Neuroimaging

Do You Act Before You Think or Think Before You Act?

A Possible Brain Mechanisms Behind COVID-19 Delirium

Researchers develop new tool for targeted cell control

Twitter Now Lets You Combine Images, Videos and GIFs in One Tweet

VPN Demand Surges in Iran as Protests Continue, Researchers Say

Spider-Man 4 might not bring back Peter’s best friend

One woman’s Apple Watch told her she was pregnant before anything else

BlackByte ransomware abuses legit driver to disable security products

OTHER TECH NEWS

Top Car News Car News