Chrysophyta or golden algae is a term used to refer to certain heterokonts .
6-499: It can be used to refer to: Chrysophyta has some characteristics which includes their possession of the photosynthetic pigments which are chlorophylls a and c, they also possess a yellow carotenoid called fucoxanthin , this is responsible for their unique and characteristic color. They also store food as oil and not starch , their cells contain no cellulose and are often impregnated with silicon compounds. Each species has its own special markings. This heterokont -related article
12-409: A conjugated carbonyl group (carbon-oxygen double bond) in the polyene chain. All of these features provide fucoxanthin with powerful antioxidant activity. In macroalgal plastids, fucoxanthin acts like an antenna for light harvesting and energy transfer in the photosystem light harvesting complexes. In diatoms like Phaeodactylum tricornutum , fucoxanthin is protein-bound along with chlorophyll to form
18-680: A light harvesting protein complex. Fucoxanthin is the dominant carotenoid, responsible for up to 60% of the energy transfer to chlorophyll a in diatoms When bound to protein, the absorption spectrum of fucoxanthin expands from 450-540 nm to 390-580 nm, a range that is useful in aquatic environments. Fucoxanthin is present in brown seaweeds and diatoms and was first isolated from Fucus , Dictyota , and Laminaria by Willstätter and Page in 1914. Seaweeds are commonly consumed in south-east Asia and certain countries in Europe, while diatoms are single-cell planktonic microalgae characterized by
24-532: Is a stub . You can help Misplaced Pages by expanding it . Fucoxanthin Fucoxanthin is a xanthophyll , with formula C 42 H 58 O 6 . It is found as an accessory pigment in the chloroplasts of brown algae and most other heterokonts , giving them a brown or olive-green color. Fucoxanthin absorbs light primarily in the blue-green to yellow-green part of the visible spectrum , peaking at around 510-525 nm by various estimates and absorbing significantly in
30-493: The estimated total production of carotenoids in nature. It is an accessory pigment found in the chloroplasts of many brown macroalgae, such as Fucus spp ., and the golden-brown unicellular microalgae, the diatoms. It absorbs blue and green light at bandwidth 450-540 nm, imparting a brownish-olive color to algae. Fucoxanthin has a highly unique structure that contains both an epoxide bond and hydroxyl groups along with an allenic bond (two adjacent carbon-carbon double bonds) and
36-438: The range of 450 to 540 nm. Carotenoids are pigments produced by plants and algae and play a role in light harvesting as part of the photosynthesis process. Xanthophylls are a subset of carotenoids, identified by the fact that they are oxygenated either as hydroxyl groups or as epoxide bridges. This makes them more water soluble than carotenes such as beta-carotene. Fucoxanthin is a xanthophyll that contributes more than 10% of
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