Also found in: Dictionary, Thesaurus, Medical, Wikipedia.


A blue phycobilin.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



any one of the blue pigments of the group of phycobilins, phycocyanin proper or allophycocyanin, contained in blue-green and red algae. The molecular weight of phycocyanins varies from 134,000 to 273,000. The protein portion consists of globular proteins in associations of several subunits, each of which is covalently bonded to two to four chromophoric groups; these groups, known as phycocyanobilins, are chemically and spectrally identical for phycocyanin and allophycocyanin. Differences in the quaternary structures of these proteins account for the nonidentical position of the bands of absorption and fluorescence in the visible portion of the spectrum: maximum absorption is 615–622 nanometers (nm) for phycocyanins and 605–654 nm for allophycocyanins, and maximum fluorescence is 647–657 nm for phycocyanins and 663–670 nm for allophycocyanins. Because of its spectral properties, allophycocyanin is capable of transmitting light absorbed by phycoerythrins and phycocyanins to chlorophyll.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Pigments such as echinenone and myxoxanthophyll, allophycocyanin, phycocyanin and chlorophyll are present in it [27].
Only a study on functional biscuits containing Spirulina or phycocyanin isolated from Spirulina reported similar levels of acceptability versus control [36].
Mass spectrometry identified two as the linker coremembrane peptide (LCM); the other three spots were identified as the [beta] subunits of phycocyanin of M.
"It contains a significant amount of phycocyanin and chlorophyll, which absorbs energy from the sun to manufacture carbohydrates to boost your energy."
Sl/No Compounds Examples Sources [beta]-carotene Fucoxanthin Chondrus crispu s Antheraxanthin, Mastocarpus stellatus 1 Carotenoids Lutein, Brown algae Violaxanthin, Red algae Xanthophylls Zeaxanthin Catechin, Epicatechin Gallate Taonia atomaria Fl avonoid s Cystoseira species 2 Phenols Ph lorotannins Palmaria palmata Stypodiol Sargassum pallidum Isoepitaondiol Fucus vesicu losus Taond iol Terpe noids 3 Pigments Phycoerythrin Red algae Phycocyanin Chondrus crispu s 4 Vitamins Ascorbate Mastocarpus stellatus Vitamin A Sargassumsp.
Interestingly, it was observed that phycocyanin, a natural compound known for its antioxidant properties, protects pancreatic [beta]-cells against IAPP-induced apoptosis by attenuating oxidative stress and modulating apoptotic pathways [130].
component of Cyactiv is phycocyanin, which is known to act as an antioxidant and a selective COX-2 inhibitor with documented regulating properties.
Water chemical parameters (pH, turbidity, dissolved oxygen, chlorophyll, blue-green algae phycocyanin, conductivity, salinity, oxidation reduction potential) are recorded every 15 min by an early warming monitoring system (model GuardianBlue, HACH Company, Loveland, Colorado) and a multi-parameter water quality analyzer (model YSI6600, YSI Inc., Yellow Spring, Ohio).
In vivo fluorescence of phycocyanin was measured as above, but using excitation and emission wavelengths of 630 and 660 nm, respectively (Seppala et al., 2007).