Postharvest culture in the dark: An eco-friendly alternative to alkali treatment for enhancing the gel quality of kappa/iota-hybrid carrageenan from Chondrus crispus (Gigartinales, Rhodophyta)

• Type: Article in International Scientific Journal
• Date: 2009

Authors

Villanueva, RD (Author) Other; Hilliou, L (Author) FEUP; Sousa Pinto, I (Author) FCUP

Journal

Title: Bioresource Technology

Vol. 100 No. 24

Pages: 2633-2638

ISSN: 0960-8524

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 19 Citations

Scopus - 22 Citations

Scientific classification

FOS: Agrarian Sciences > Agricultural biotechnology

Other information

Authenticus ID: P-003-K7E

DOI: 10.1016/j.biortech.2008.11.053

Abstract (EN): After harvesting from natural stocks, female gametophytes of the red seaweed Chondrus crispus were cultured for several days under a light-deprived regime in order to determine if dark treatment can improve the gel quality of carrageenan extracted from the seaweed. An increase in the gel strength of native carrageenan was observed after dark treatment for 10 d, but not after 5 d, as compared to that of freshly harvested (baseline) seaweed. Corresponding decrease in sulfate and increase in 3,6-anhydrogalactose (3,6-AG) contents of the carrageenan extract were also observed. We posit that during dark treatment, the production of sulfated carrageenan precursor units was prevented while the enzymatic conversion of the prevailing precursor units to the gelation-promoting 3,6-AG was allowed to proceed. The observed increase in carrageenan gel strength with a 10-d dark treatment was comparable to the effect of the widely-used industrial procedure of alkali treatment in improving the extract's gel quality. Hence, post-harvest culture in the dark for 10 d can be an eco-friendly alternative to alkali treatment.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6