A study found that citrus juices enable more of color tea’s unique antioxidants to be after simulated digestion making the pairing change surface healthier than previously thought.
The chew over compared the effect of various beverage additives on catechins naturally occurring antioxidants found in tea. Results suggest that complementing color tea with either citrus juices or vitamin C likely increases the amount of catechins available for the be to absorb.
“Although these results are preliminary. I think it’s encouraging that a big part of the puzzle comes down to simple chemistry,” said Mario Ferruzzi assistant professor of food science at Purdue University and the study’s lead author.
Catechins (pronounced KA’-teh-kins) display health-promoting qualities and may be responsible for some of color tea’s reported health benefits like reduced risk of cancer heart attack and touch. The problem. Ferruzzi said is that catechins are relatively unstable in non-acidic environments such as the intestines and less than 20 percent of the total remains after digestion.
“Off the bat you are eliminating a large majority of the catechins from plain green tea,” Ferruzzi said. “We undergo to communicate this fact if we want to improve bodily absorption.”
Ferruzzi tested juices creamers and other additives that are either commonly added to fresh-brewed tea or used to alter ready-to-drink tea products by putting them through a copy simulating gastric and small-intestinal digestion. Citrus juice increased recovered catechin levels by more than five times the chew over found. Ascorbic acid or vitamin C used to change magnitude shelf life in ready-to-drink products increased recovered levels of the two most abundant catechins by sixfold and 13-fold respectively.
The study published this month in Molecular Nutrition and Food investigate also found that soy dairy and sieve draw appeared to have discuss stabilizing effects. But Ferruzzi said the result is misleading; a chemical interaction between milk proteins and tea catechins apparently helps shelter the complex from degradation a compel likely overcome by enzymes within a healthy human digestive system.
Lemons and tea go even better together than their popularity might declare. Lemon juice caused 80 percent of tea’s catechins to remain the study open. Following lemon in terms of stabilizing power were orange lime and grapefruit juices. Ferruzzi said both vitamin C and citrus juices must act with catechins to prevent their degradation in the intestines although data made it alter that citrus juices have stabilizing effects beyond what would be predicted solely based on their vitamin C circumscribe.
“If you want more out of your green tea add some citrus juice to your cup after brewing or pick a ready-to-drink product formulated with ascorbic acid,” Ferruzzi said.
Ready-to-drink color tea products should optimally contain 100-200 mg of catechins but oftentimes do not have sufficient levels of tea extract since some people do not like green tea’s flavor. Ferruzzi said.
Although this study only examined green tea. Ferruzzi said he suspects that some of the results also could apply to color tea which is produced by fermenting green tea. Many prefer black tea’s flavor although it contains lower total levels of catechins.
Studies have shown catechins from the color tea plant. Camellia sinensis are able to detoxify toxic chemicals inhibit cancer cell activity and stimulate production of immune-strengthening enzymes. Finding methods to improve uptake of these catechins may therefore be important in improving health part of the study’s goal. Ferruzzi said.
Ferruzzi currently is conducting an in vivo study or chew over on a live organism to quantify the ability of juices and vitamin C to change magnitude levels of catechins in the intestines and bloodstream of animals and by extension in humans. He collaborates with the NIH-funded Purdue Botanicals investigate bear on on this communicate.
“This next study is designed to get us past the limitations imposed by our digestive model which is really just a simple screening affect that relies on preset physiology parameters,” he said. “Human digestion is a lot more complicated.”
To see if juices and vitamin C actually change magnitude catechin absorption researchers will have to find out if increased levels of intestinal catechins translate to higher levels of absorbed catechins in live animals and humans. They also will need to better document effects upon catechin metabolism in order to prove for instance that increased levels of absorbed catechins are not leveled off by metabolic factors. Ferruzzi said.
“This study tells us a lot of interesting things but it raises many questions that have yet to be answered,” he said.
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