Biochemical and Nutritional Evaluation of Chlorella and Auxenochlorella Biomasses Relevant for Food Application

Frontiers in Nutrition

Roberta Carpine¹  Lukas Neutsch²  Carmen Tarnutzer³  Alexander Mathys³  Greta Canelli³  Christoph J. Bolten⁴  Fabiola Dionisi⁴ 

[1] Department of Organic Chemistry, University of Zürich, Zurich, Switzerland;Institute of Chemistry and Biotechnology, ZHAW, Zurich University of Applied Sciences, Wädenswil, Switzerland;Laboratory of Sustainable Food Processing, ETH Zurich, Swiss Federal Institute of Technology, Zurich, Switzerland;Nestlé Research, Lausanne, Switzerland;

关键词: microalgae;    Chlorella;    Auxenochlorella;    bioaccessibility;    omega-3-polyunsaturated fatty acids;    protein;   

DOI  :  10.3389/fnut.2020.565996

来源: DOAJ

【 摘 要 】

Microalgae are a source of potentially healthy and sustainable nutrients. However, the bioaccessibility of these nutrients remains uncertain. In this study, we analyzed the biomass composition of five commercial Chlorella and Auxenochlorella strains, and Chlorella vulgaris heterotrophically cultivated in our laboratory. Protein accounted for 65 ± 3% (w w−1) dry matter (DM) in all biomasses, except for the lab-grown C. vulgaris that contained 20% (w w−1) DM protein. The fatty acids content was comparable and ranged between 7 and 10% (w w−1) DM. Most of the biomasses had a ω6-polyunsaturated fatty acids (PUFAs)/ω3-PUFAs ratio <4, as recommended by nutritional experts. A recently published harmonized protocol for in vitro digestion was used to evaluate fatty acids and protein bioaccessibilities. Protein bioaccessibility ranged between 60 and 74% for commercial Chlorella and Auxenochlorella biomasses and was 43% for the lab-grown C. vulgaris. Fatty acids bioaccessibility was <7% in commercial biomasses and 19% in the lab-grown C. vulgaris. Taken together, the results show that microalgae are promising sources of bioaccessible protein. The limited fatty acids bioaccessibility indicates the need for alternative upstream and downstream production strategies.

【 授权许可】

Unknown