Difference Between Natural and Synthetic Forms
Astaxanthin has two chiral centers, at the 3- and 3′-positions. Therefore, there are three stereoisomers; (3R,3′R), (3R,3′S) (meso), and (3S,3′S). Synthetic astaxanthin contains a mixture of the three, in approximately 1:2:1 proportions. Naturally occurring astaxanthin varies considerably from one organism to another. The astaxanthin in fish is of whatever stereoisomer the fish ingested. The astaxanthin produced by haematococcus pluvialis, which is commonly used in the feed of animals that are in turn consumed by humans, is the (3S,3′S) stereoisomer.
Read more about this topic: Astaxanthin
Famous quotes containing the words difference between, difference, natural, synthetic and/or forms:
“The difference between guilt and shame is very clear—in theory. We feel guilty for what we do. We feel shame for what we are. A person feels guilt because he did something wrong. A person feels shame because he is something wrong. We may feel guilty because we lied to our mother. We may feel shame because we are not the person our mother wanted us to be.”
—Lewis B. Smedes, U.S. psychologist, educator. Shame and Grace: Healing the Shame We Don’t Deserve, ch. 2, Harper (1993)
“...there is a difference between being convinced and being stubborn. I’m not certain what the difference is, but I do know that if you butt your head against a stone wall long enough, at some point you realize the wall is stone and that your head is flesh and blood.”
—Maya Angelou (b. 1928)
“Death of the self in a long, tearless night,
All natural shapes blazing unnatural light.”
—Theodore Roethke (1908–1963)
“In every philosophical school, three thinkers succeed one another in the following way: the first produces out of himself the sap and seed, the second draws it out into threads and spins a synthetic web, and the third waits in this web for the sacrificial victims that are caught in it—and tries to live off philosophy.”
—Friedrich Nietzsche (1844–1900)
“Our normal waking consciousness, rational consciousness as we call it, is but one special type of consciousness, whilst all about it, parted from it by the filmiest of screens, there lie potential forms of consciousness entirely different.”
—William James (1842–1910)