Proteolysis, NaOH and Ultrasound-Enhanced Extraction of Anticoagulant and Antioxidant Sulfated Polysaccharides from the Edible Seaweed, Gracilaria birdiae

Molecules

Gabriel Pereira Fidelis¹  Rafael Barros Gomes Camara¹  Moacir Fernandes Queiroz¹  Mariana Santana Santos Pereira Costa¹  Pablo Castro Santos¹  Hugo Alexandre Oliveira Rocha¹  Leandro Silva Costa¹ 

[1]Laboratory of Biotechnology of Natural Polymers (BIOPOL), Department of Biochemistry, Federal University of Rio Grande do Norte (UFRN), Natal-RN 59078-970, Brazil

[2] E-Mails:

关键词: aPTT assay;    total capacity antioxidant;    sonication;    proteolysis;    red seaweed;   

DOI  :  10.3390/molecules191118511

来源: mdpi

【 摘 要 】

The sulfated polysaccharides (SP) from the edible red seaweed, Gracilaria birdiae, were obtained using five different extraction conditions: Gracilaria birdiae 1 (GB1)-water; GB1s-water/sonication; GB1sp-water/sonication/proteolysis; GB2s-NaOH/sonication; and GB2sp-NaOH/sonication/proteolysis. The yield (g) increased in the following order: GB2sp > GB1sp > GB2s > GB1s > GB1. However, the amount of SP extracted increased in a different way: GB2sp > GB1 > GB1sp > GB1s > GB2s. Infrared and electrophoresis analysis showed that all conditions extracted the same SP. In addition, monosaccharide composition showed that ultrasound promotes the extraction of polysaccharides other than SP. In the prothrombin time (PT) test, which evaluates the extrinsic coagulation pathway, none of the samples showed anticoagulant activity. While in the activated partial thromboplastin time (aPTT) test, which evaluates the intrinsic coagulation pathway, all samples showed anticoagulant activity, except GB2s. The aPTT activity decreased in the order of GB1sp > GB2sp > GB1 > GB1s > GB2s. The total capacity antioxidant (TCA) of the SP was also affected by extraction condition, since GB2s and GB1 showed lower activity in comparison to the other conditions. In conclusion, the conditions of SP extraction influence their biological activities and chemical composition. The data revealed that NaOH/sonication/proteolysis was the best condition to extract anticoagulant and antioxidant SPs from Gracilaria birdiae.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.