Title of article :
UV radiation-induced biosynthesis, stability and antioxidant activity of mycosporine-like amino acids (MAAs) in a unicellular cyanobacterium Gloeocapsa sp. CU2556
Author/Authors :
Rastogi، نويسنده , , Rajesh P. and Incharoensakdi، نويسنده , , Aran، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2014
Pages :
6
From page :
287
To page :
292
Abstract :
The biosynthesis of natural sunscreening compounds as influenced by ultraviolet radiation, their stability and antioxidant activity were studied in the cyanobacterium Gloeocapsa sp. CU-2556. An analysis by high-performance liquid chromatography (HPLC) with photodiode-array (PDA) detection revealed the biosynthesis of two MAAs, shinorine (UVλmax 333 nm) and an unknown MAA designated as M-307 (UVλmax 307 nm) with retention times of 5.9 and 6.4 min, respectively. Induction of the synthesis of MAAs was studied under 395 (PAR), 320 (PAR + UV-A) and 295 (PAR + UV-A + UV-B) nm cut-off filters. MAAs induction was significantly increased with an increase in exposure time up to 72 h in the samples covered with 295 nm cut-off filters. Contrary to shinorine, the biosynthesis of M-307 was more dominant in this unicellular cyanobacterium. Both MAAs were highly stable to some physico-chemical stressors such as UV radiation, heat and a strong oxidizing agent. The MAA M-307 was more stable under strong oxidative stress than shinorine. Moreover, UV-C radiation drastically decreased the stability of both MAAs. The MAAs (shinorine + M-307) also exhibited efficient antioxidant activity which was dose-dependent. The results indicate that MAAs may perform a vital role in survival and sustainability of Gloeocapsa sp. CU-2556 in harsh environmental conditions by its ability to absorb/screen short wavelength UV radiation and antioxidant function.
Keywords :
antioxidant , Cyanobacteria , Mycosporine-like amino acid , stability , UV radiation
Journal title :
Journal of Photochemistry and Photobiology B:Biology
Serial Year :
2014
Journal title :
Journal of Photochemistry and Photobiology B:Biology
Record number :
1878736
Link To Document :
بازگشت