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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).
Bioresour Technol. 2009 May; 100(9):2633-8.BT

Abstract

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 10d, but not after 5d, 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, postharvest culture in the dark for 10d can be an eco-friendly alternative to alkali treatment.

Authors+Show Affiliations

REQUIMTE-CEQUP, Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal. villanuevr@yahoo.comNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19138513

Citation

Villanueva, R D., et al. "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)." Bioresource Technology, vol. 100, no. 9, 2009, pp. 2633-8.
Villanueva RD, Hilliou L, Sousa-Pinto I. 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). Bioresour Technol. 2009;100(9):2633-8.
Villanueva, R. D., Hilliou, L., & Sousa-Pinto, I. (2009). 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). Bioresource Technology, 100(9), 2633-8. https://doi.org/10.1016/j.biortech.2008.11.053
Villanueva RD, Hilliou L, Sousa-Pinto I. 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). Bioresour Technol. 2009;100(9):2633-8. PubMed PMID: 19138513.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - 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). AU - Villanueva,R D, AU - Hilliou,L, AU - Sousa-Pinto,I, Y1 - 2009/01/09/ PY - 2008/10/10/received PY - 2008/11/17/revised PY - 2008/11/30/accepted PY - 2009/1/14/entrez PY - 2009/1/14/pubmed PY - 2009/4/18/medline SP - 2633 EP - 8 JF - Bioresource technology JO - Bioresour Technol VL - 100 IS - 9 N2 - 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 10d, but not after 5d, 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, postharvest culture in the dark for 10d can be an eco-friendly alternative to alkali treatment. SN - 1873-2976 UR - https://www.unboundmedicine.com/medline/citation/19138513/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__ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0960-8524(08)01064-X DB - PRIME DP - Unbound Medicine ER -