In its standard structure in the average red tomato, the lycopene molecule is laid out in a linear configuration. That structure seems to hinder the molecule’s absorption through intestinal walls and into the blood, said Steven Schwartz, a professor of food science and technology at Ohio State.
Meanwhile, most of the lycopene that is found circulating in human blood is configured in a bent molecular form. This means that either the human body somehow transforms lycopene molecules through reactions that have yet to be identified, or that the bent molecular structures of lycopene are much more likely to be absorbed into the blood and transported to tissue – a necessary step in preventing disease.
Assuming the latter is true, Schwartz and colleagues have devised a way to process red tomatoes – the variety preferred by American consumers – into a sauce that contains bent molecular forms of lycopene. A clinical trial conducted in collaboration with Steven Clinton, a medical oncologist and physician scientist in Ohio State’s Comprehensive Cancer Center, showed that people had more lycopene in their blood after eating the specially processed sauce than they did after eating regular red tomato sauce.
Schwartz described the research today (8/20) at the American Chemical Society meeting in Philadelphia.
In the food science world, processing gets a bad rap for its tendency to deplete vegetables of nutrients, change their color and often negatively affect how they taste.
“Instead, here is a case where processing is positive in terms of enhancing absorption of lycopene,” said Schwartz, who is also an investigator in Ohio State’s Comprehensive Cancer Center.
Lycopene belongs to a family of antioxidants called carotenoids, which give certain fruits and vegetables their distinctive colors. Carotenoids’ antioxidant properties are associated with protecting cells and regulating cell growth and death, all of which play a role in multiple disease processes.
In its natural state, lycopene in a red tomato is in what is called an all-trans configuration, characterized by its linear form. The molecular structure of lycopene circulating in human blood is in what is called a cis-isomer configuration, or a bent form. The chemical properties are the same – only the configuration differs.
“What we have found is we can take the red tomato molecular form of lycopene and by processing it and heating it in combination with added oil, we can change the shape of the molecule so it is configured in this bent form,” Schwartz said.
Heat is essential to the process, but so is adding some fat, Schwartz said. In previous work, he and colleagues determined that consuming fat and carotenoids simultaneously improved absorption of lycopene and other compounds, but the scientists weren’t sure exactly why.
When humans eat fats, or lipids, the body produces tiny droplets of fat called lipid micelles during digestion that are easily taken up through the intestinal wall and absorbed into the bloodstream. Continuing research has led Schwartz to hypothesize that lycopene in its linear form tends to stack and become crystallized, which lowers, but does not eliminate, its absorption potential. But the bent forms of lycopene are able to more easily find their way into the lipid micelles during digestion, and increasing amounts of the antioxidant in that form are more likely to be transported to the blood along with the fats.
Taking all this into consideration, the researchers processed red tomatoes into two kinds of sauce: a sauce rich in cis-lycopene, the bent configuration, and a sauce containing mostly all-trans-lycopene, the linear form. Both sauces were flavored similarly and initially heated using the same methods. Corn oil was added to both sauces as well. But the sauce designed to produce lycopene in the bent molecular forms was subjected to a second round of heating at 260 degrees Fahrenheit for 40 minutes. The resulting sauce contained nine times more cis-isomers than the regularly processed sauce.
Twelve people participated in a study of the sauces, and all ate both kinds of sauce over the course of the study. After each meal, researchers took samples of participants’ blood seven times during the following 9 1/2 hours to measure lycopene levels. The scientists used a special testing method to analyze lycopene levels in the blood associated only with the tomato sauce meal, avoiding any other possible sources of those compounds in the bloodstream.
Research participants had a 55 percent increase in total lycopene absorption after eating the specially processed sauce when compared to their lycopene blood levels after eating the regular sauce. This finding reinforced the expectation that the bent forms of lycopene are more easily absorbed into human blood, Schwartz said. Details of this study were first published in the British Journal of Nutrition in 2007. Additional clinical trials are ongoing.
Schwartz said most currently available commercial products don’t contain the bent forms of lycopene molecules. But he noted that some home cooking practices might be able to produce the same results as the special processing method he and colleagues designed.
“Some people like to cook tomato sauce for prolonged periods, sometimes reheating it day after day, because it tastes better on the second and third day. They add fat by using oil or meat, and that’s going to start to induce cis-isomers of lycopene if fat is present and the cooking continues,” Schwartz said. “So it’s possible people could induce this process and increase lycopene absorption by routine food preparation procedures, as well.”
Much of this research is supported by the Ohio Agricultural Research and Development Center Competitive Grants Program, the National Center of Research Resources of the National Institutes of Health, the National Cancer Institute, and the U.S. Department of Agriculture Initiative for Future Agricultural & Food Systems.
Contact: Steven Schwartz, (614) 292-2934; Schwartz.email@example.com
Emily Caldwell | Newswise Science News
Cancer diagnosis: no more needles?
25.05.2018 | Christian-Albrechts-Universität zu Kiel
Less is more? Gene switch for healthy aging found
25.05.2018 | Leibniz-Institut für Alternsforschung - Fritz-Lipmann-Institut e.V. (FLI)
The more electronics steer, accelerate and brake cars, the more important it is to protect them against cyber-attacks. That is why 15 partners from industry and academia will work together over the next three years on new approaches to IT security in self-driving cars. The joint project goes by the name Security For Connected, Autonomous Cars (SecForCARs) and has funding of €7.2 million from the German Federal Ministry of Education and Research. Infineon is leading the project.
Vehicles already offer diverse communication interfaces and more and more automated functions, such as distance and lane-keeping assist systems. At the same...
A research team led by physicists at the Technical University of Munich (TUM) has developed molecular nanoswitches that can be toggled between two structurally different states using an applied voltage. They can serve as the basis for a pioneering class of devices that could replace silicon-based components with organic molecules.
The development of new electronic technologies drives the incessant reduction of functional component sizes. In the context of an international collaborative...
At the LASYS 2018, from June 5th to 7th, the Laser Zentrum Hannover e.V. (LZH) will be showcasing processes for the laser material processing of tomorrow in hall 4 at stand 4E75. With blown bomb shells the LZH will present first results of a research project on civil security.
At this year's LASYS, the LZH will exhibit light-based processes such as cutting, welding, ablation and structuring as well as additive manufacturing for...
There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?
At Display Week 2018, scientists from the Fraunhofer Institute for Applied Polymer Research IAP will be demonstrating today’s technological possibilities and...
So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics
Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...
25.05.2018 | Event News
02.05.2018 | Event News
13.04.2018 | Event News
25.05.2018 | Event News
25.05.2018 | Machine Engineering
25.05.2018 | Life Sciences