African Journal of
Food Science

  • Abbreviation: Afr. J. Food Sci.
  • Language: English
  • ISSN: 1996-0794
  • DOI: 10.5897/AJFS
  • Start Year: 2007
  • Published Articles: 975

Full Length Research Paper

Spirulina platensis biomass cultivated in Southern Brazil as a source of essential minerals and other nutrients

Lidiane Muniz Moreira1*, Anelise Christ Ribeiro1, Fábio Andrei Duarte2, Michele Greque de Morais2 and Leonor Almeida de Souza Soares1
1Food Science Laboratory, Chemistry and Food School, Federal University of Rio Grande, Brazil. 2Department of Chemistry, Federal University of Santa Maria, Brazil.
Email: [email protected]

  •  Accepted: 18 November 2013
  •  Published: 31 December 2013

Abstract

The aim of this study was to determine elemental constituent of microalgal biomass Spirulina platensis LEB-18 grown on the shores of Mangueira Lagoon, South of Brazil. The spread of inoculum was performed in standard Zarrouk medium. When the microalgae concentration reached 0.50 g L-1, the biomass was separated by filtration and dried in a tray dryer at 50°C for 5 h. The harvested biomass was then ground in a ball mill, sieved to achieve a particle size of 88 µm (~ 300 mg) in triplicate, digested with concentrated HNO3 and diluted with up to 5% HNO3 for subsequent quantification. Mineral content was determined by inductively coupled plasma optical emission spectrometry with axial view and other nutrients by standard methods. Among the macro minerals, in μg g-1 ± standard deviation, calcium (15.108±529), sodium (14.6552±485) and potassium (14.036±109) were found in the largest amount. The micro mineral present in greater quantity, in μg g-1 ± standard deviation, was the iron (956±9) and nutrients present in the following order: protein (58.5%), ash (12.0%), carbohydrate (7.5%), lipid (7.0%) and crude fiber (0.95%). Results were compared with the values of minerals for human consumption recommended by the Food and Drug Administration and also with the Recommended Daily Intake (RDI) of minerals by Brazilian Legislation. The findings proved promising for the use of S. platensis strain LEB-18 as an alternative source of essential minerals and other nutrients for the human body.

Key words: Cyanobacterium, chemical element, nutritional importance, optical emission spectrometry.