Abstract
Spirulina (Arthrospira) platensis biomass has a wide range of applications in several industries. One of the key issues for its production is the reduction of the culture medium cost. Here we have shown the possibility of a single recycling (repeated usage) of the modified Zarrouk nutrient medium (MZM; which contains 8.4 g/l of NaHCO3and 0.1 g/l of NaOH instead of 16.8 g/l of NaHCO3) for spirulina cultivation without altering culture productivity, photosynthetic pigments and protein contents in its biomass given that technological approach consisting in application of a mixture of a freshly prepared and once recycled modified Zarrouk medium in a ratio of 1:1 by volume is used. The obtained results can be applied for further reduction of costs of spirulina biomass production compared to methods described in previous studies.
Highlights
Spirulina (Arthrospira) platensis biomass has a wide range of applications in several industries
We have shown the possibility of a single recycling (repeated usage) of the modified Zarrouk nutrient medium (MZM; which contains 8.4 g/l of NaHCO3 and 0.1 g/l of NaOH instead of 16.8 g/l of NaHCO3) for spirulina cultivation without altering culture productivity, photosynthetic pigments and protein contents in its biomass given that technological approach consisting in application of a mixture of a freshly prepared and once recycled modified Zarrouk medium in a ratio of 1:1 by volume is used
Отмеченное выше снижение содержания хлорофилла а и фикоцианина может быть обусловлено недостатком в повторно используемой модифицированной среде Заррука (МСЗ) ионов Fe2+, играющих ключевую роль в биосинтезе тетрапирролов
Summary
Spirulina (Arthrospira) platensis biomass has a wide range of applications in several industries. Среду для повторного использования получали следующим образом: спирулину выращивали в МСЗ (конечная оптическая плотность суспензии составляла в среднем около 1,0) в течение 7 сут, затем трихомы спирулины отделяли от среды культивирования путем фильтрации. Проведенные нами эксперименты показали, что содержание сухой массы спирулины (в 1 мл суспензии) при применении повторно используемой среды МСЗ («50 % ИС» и «100 % ИС») достоверно не отличалось от контроля в течение всего времени выращивания
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