Mikroalgen

Mikroalgen are microscopic, photosynthetic organisms found in nearly all aquatic environments, from freshwater to the open ocean. Most are eukaryotic algae, including green algae, diatoms and dinoflagellates, though some broader usages include cyanobacteria as microalgae. They range from single cells to simple colonies and are notable for their rapid growth and diverse pigments that capture light for photosynthesis.

Ecologically, microalgae are primary producers and form the base of many aquatic food webs. They fix carbon dioxide and generate organic matter used by a wide range of organisms. Some species can form blooms; under certain conditions these blooms may deplete oxygen or release toxins, a phenomenon known as harmful algal blooms.

Applications of microalgae are diverse. They provide nutritional supplements and food ingredients, with species such as Chlorella and Arthrospira (spirulina) widely used for human consumption and animal feeds. They accumulate valuable lipids, including omega-3 fatty acids, and produce pigments like beta-carotene and astaxanthin. Microalgae are also investigated for pharmaceuticals and nutraceuticals, and are explored for industrial uses such as biofuels, waste-water treatment, and carbon dioxide capture.

Cultivation methods include open ponds and closed photobioreactors, chosen based on species, scale, and product goals. Cultivation relies on managing light, nutrients, temperature, and gas exchange. Downstream processing, including harvesting, dewatering, and purification, remains a major cost factor and technical challenge.

Safety and regulation address potential toxins and contaminants; certain species require monitoring and quality control for food, feed, or pharmaceutical applications. Microalgae thus represent a versatile group with ecological importance and wide-reaching commercial potential.