The rumor is that: a lady to eat when the two Red dragon fruit toilets found in urine red. Reporter empirical case. The fruit that Red dragon fruit is rich in anthocyanins, a water-soluble strong, if not completely absorb and decompose, pee or poop will be red. Nephrology experts say, eating Red dragon fruit is indeed possible red urine.
A rumor Wikipedia:
Pitaya effect eating red meat cause discoloration of urine, not anthocyanins, but beet red pigment role.
Argumentation
In fact, eating red meat dragon fruit cause discoloration of urine, not the role of anthocyanins, but beet red pigment role. Two kinds of pigment vary widely.
Said plant pigment, anthocyanin is very important class, the color of most plants are due to anthocyanins. However, in the Caryophyllales plants, beet red pigment is a principal pigment. Caryophyllales Amaranthaceae species including, phytolaccaceae, cactus, etc., but it belongs to the cactus dragon fruit, its flesh color is the result of beet red pigment. Incidentally, beet red pigment (betacyanin) the earliest sources of sugar beet (Beta vulgaris), is Amaranthaceae chenopodiaceae (the previous classification system is Chenopodiaceae) of.
Beet red pigment is essentially a nitrogen-containing pyridine derivative in plants generally glycoside form. Similar and anthocyanins, beet red pigment also different pH show different colors.
For beet red pigment, its main chromophore group is set below pyridine derivative group, namely to acid. Glycosylation in the human body in general is hydrolyzed after the digestive system, and the main chromophore is relatively stable, especially to acid is not easily degraded by the body. Therefore excreted with the feces or from urinary system, causing the urine appear red. Beeturia term is specifically used to describe the excessive intake of beet red pigment caused the urine red.
Anthocyanins are flavonoids and derivatives thereof, hair color group is more conjugated ring structure. In the human body this conjugated structure is easily oxidized destroyed, so the intake of anthocyanins generally does not result in discolored urine.
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