Abstract
Most commercial algal extracts are produced from brown algae by alkaline hydrolysis; however, little scientific information has been published regarding the details of the production process. In this research, we have investigated the effect of pH (pH 8–12) and temperature (40, 60, and 80 °C) on liquid extract production from the brown alga Macrocystis pyrifera. Production conditions influenced the physicochemical characteristics of the final product as the extract viscosity increased with increasing pH and temperature to a maximum which occurred at pH 10 and 80 °C. This suggests that at higher pH conditions, alginate and other polysaccharides were extracted. All the extracts obtained promoted growth of tomato plants (Solanum lycopersicum) and adventitious root formation in the mung bean cutting bioassay (Vigna radiata), as the pH process was increased during the production of the liquid extracts. The highest auxin-type activity was obtained with the extract produced at pH 11 and 80 °C, while the fastest tomato seedling growth was achieved with the extract produced at pH 12 and 80 °C.
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Acknowledgments
The University of KwaZulu-Natal, Consejo Nacional de Ciencia y Tecnología (Fellowship # 37647), Fondo mixto CONACYT-QUINTANA ROO Project # QROO-2011-C01-174594, Programa Institucional de Formación de Investigadores (PIFI), Programa de Becas de Exclusividad (COFAA-IPN), Estimulo al Desempeño de los Investigadores (EDI-IPN), and Secretaria de Investigación y Postgrado of IPN (Project #s 20090563, 20100889, and 20111212) are thanked for financial support. We wish to thank MCs Ivonne Cruz-Santander and MCs Renato Borras-Chavez for suggestions to the manuscript, Mr. Kim Siewers for English editing, and two anonymous reviewers that significantly improved this paper.
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Briceño-Domínguez, D., Hernández-Carmona, G., Moyo, M. et al. Plant growth promoting activity of seaweed liquid extracts produced from Macrocystis pyrifera under different pH and temperature conditions. J Appl Phycol 26, 2203–2210 (2014). https://doi.org/10.1007/s10811-014-0237-2
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DOI: https://doi.org/10.1007/s10811-014-0237-2