Cyanophycin granule polypeptide from some cyanobacteria along Damietta branch of the River Nile, Egypt

Authors

Department of Botany and Microbiology, Faculty of Science, Damietta University, New Damietta City, Egypt

10.22092/ijfs.2026.135503

Abstract

Cyanobacteria are one of the most common and widespread microorganisms that produce cyanophycin granule polypeptide (CGP). This biopolymer could be used to produce CGP-derived dipeptides and as a potential precursor for the synthesis of polyaspartic acid. To extend the applications of this polymer, it is therefore of interest to study its isolation and purification. The present study was undertaken to follow up CGP production by some cyanobacteria isolated from the River Nile, Damietta Branch, Egypt, and to morphologically identify its algal diversity. The results of this study reported that Cyanophytes dominated at AL Zarqa, Faraskur, and Al Adliya meanwhile Chlorophytes and Bacillariophytes dominated at El Serw and Kafr Al Arab. Anabaena anomala, A. cylindrica, A. oryzae, A. variabilis, Nostoc sp., Nostoc punctiforme, Oscillatoria obscura, Spirulina platensis, Synechococcus sp. were identified by microscopic examination. The isolated cyanobacteria produced CGP in different amounts ranging from 0.030 ± 0.001 g L-1 in Oscillatoria obscura to 0.224 ± 0.007 g L-1 in Anabaena cylindrica. Transmission Electron Microscopy revealed that CGP produced by Anabaena cylindrica was dark and spherical with irregular parameters bodies. Based on this study, regular monitoring of cyanobacteria and their CGP production is necessary to extend their applications.

Keywords

Iranian Journal of Fisheries Sciences
Volume 25, Issue 3
May 2026
Pages 495-508

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