Phycoerythrins

A Comprehensive Review of the Nutraceutical and Therapeutic Applications of Red Seaweeds (Rhodophyta)

“…These compounds can efficiently transmit light energy to chlorophyll a, and thus algae are capable of undergoing photosynthesis [91,92]. From their light absorption properties and types of bilins, Phycobiliproteins are divided into four main groups: phycoerythrins (λ max 540-570 nm), phycocyanins (λ max 610-620 nm), phycoerythrocyanins (λ max 560-600 nm), and allophycocyanins (λ max 650-655 nm) [93]. Phycobiliproteins from red seaweeds form complexes between proteins and covalently bound phycobilins, which act as chromophores (the light-capturing part).…”

One-step chromatographic procedure for purification of B-phycoerythrin from Porphyridium cruentum

“…According to their spectral properties, PBPs are commonly classified phycoerythrins (PE, l max ¼ 540e570 nm), phycoerythrocyanins (PEC, l max ¼ 560e600 nm), phycocyanins (PC, l max ¼ 610e620 nm), and allophycocyanins (APC, l max ¼ 650e655 nm) [6,7]. These proteins are an ensemble of photosynthetic complex called phycobilisome and work as accessory pigments to allow light absorption in the cell on the thylakoids of chloroplast [8e10].…”

“…R-PE is usually extracted and purified from Porphyra, Grateloupia and Polysiphonia, but most of them contained huge amount of polysaccharides which form gel (carbohydrate) and thereby making the purification task most difficult and tedious [2,24e27]. B-PE is the main phycobiliprotein of Porphyridium species and it contains three subunits (ab) 6 g with molecular weights of 19.5 kDa (a and b subunits) and 29 kDa (g subunit) for a total molecular weight of 263 kDa [10]. This phycoerythrin normally has a double absorption peaks at~545 and 565 nm, and a shoulder peak at~498 nm, and a fluorescence emission maximum at 580 nm [11].…”

Dual emission from nanoconfined R-phycoerythrin fluorescent proteins for white light emission diodes

“…R-phycoerythrin (R-PE) is a kind of uorescent protein, which carries two types of chromophores including phycoerythrobilin (PEB) and phycourobilin (PUB). [24][25][26][27] Generally, the UVvis absorption peak of R-PE at 498 nm is attributed to PUB and those at 540 nm as well as 560 nm are attributed to PEB. In pH 6.8 and 0.1 M phosphate buffer, R-PE emitted strong uorescence at 578 nm due to the energy transfer between PEB and PUB.…”

“…This is probably because the polypeptide structures of R-PE are pulled apart due to electrostatic-assisted assembly along the ZHNs, and the formation of PEB-Zn and PUB-Zn complexes. 26,27,29,[43][44][45] The resultant R-PE/QDs@ZIF-8 thin lm exhibits a high photoluminescence quantum yield (PLQY) of 29.8% as R-PE and the QDs are well isolated in the ZIF-8 thin lm, which restricts aggregation-caused PL quenching. 4,5 What's more, the prepared thin lm was processed into a highquality warm-white LED with ideal CIE coordinates of (0.34, 0.34), a high CRI value of 85 and a moderate CCT value of 4955 K. This process provides a new method to manipulate the uorescence colors and enhance the thermal stability of FP based-thin lms for WLEDs.…”