Abstract
<p><em>Spirulina platensis</em> known as filamentous cyanobacteria, single-celled and spiral-shaped. It is often called blue-green microalgae. This study aimed to determine the effect of photoperiod on the characteristic of <em>S. platensis</em> which were cultivated in a controlled photobioreactor (FK) and uncontrolled photobioreactor (FTK). The observed characteristics include the growth curves, dried weight of biomass, carbohydrates content, protein, fat and bioactive compounds. The research used Completely Randomized Design (CRD) with two replications. <em>S. platensis</em> was cultured in 10 L volume using combination of urea, organic fertilizer RI1 and Plant catalyst (URC medium) at 24:0, 16:8, 12:12 and 6:18 (light hours:dark hours) photoperiods. The results showed the controlled photobioreactor (FK) with 24:0 photoperiods had Optical Density (0.882), dried biomass (0.31 g/L) and carbohydrate (25.85%) highest than those of other treatments. Uncontrolled photobioreactor (FTK) with photoperiods 12:12 and 16:8 had the higher protein content (58,44%) than of other treatments. The highest total fat (6.60%) occurred in photoperiod 6:18. The results of bioactive compounds based on phytochemical analysis for the whole treatment positively contained flavonoids, phenols, steroids and saponins.</p>
Highlights
Mikroalga merupakan salah satu komoditi hasil perairan yang memiliki potensi besar untuk dimanfaatkan sebagai bahan pangan, pakan maupun obat-obatan
Spirulina platensis known as filamentous cyanobacteria, single-celled and spiral-shaped
This study aimed to determine the effect of photoperiod on the characteristic of S. platensis which were cultivated in a controlled photobioreactor (FK) and uncontrolled photobioreactor (FTK)
Summary
Bahan-bahan yang digunakan terdiri dari bahan untuk proses kultivasi meliputi air tawar, air laut, bibit mikroalga Spirulina platensis yang diperoleh dari koleksi mikroalga Balai Besar Perikanan Budidaya Air Payau (BBPBA), Jepara Jawa Tengah, media Walne, media organik (kombinasi pupuk urea, pupuk organik RI1 dan plant catalyst). Penyegaran bibit S. platensis dilakukan dalam toples kaca dengan total volume kultur 2 L. Penyegaran dilakukan dengan pencahayaan 24 jam terang, intensitas cahaya 2.500-3.000 lux dan aerasi secara terus-menerus selama tujuh hari (Fahleny et al 2014). Total volume kultur yaitu 10 L, media yang digunakan berupa kombinasi urea dengan media organik yang terdiri dari pupuk RI1 dan Plant Catalyst (URC). Kultivasi menggunakan FTK dilakukan dalam sebuah toples kaca yang diletakkan dalam ruangan dengan pencahayaan (lampu) hanya pada salah satu sisinya dan pencahayaan cenderung menyebar ke seluruh ruangan. Biomassa yang dihasilkan dari tiap perlakuan dikeringkan dalam oven pada suhu 40°C selama ±24 jam. Biomassa dari kultivasi dengan perlakuan fotoperiode terpilih berdasarkan kandungan nutrisi tertinggi serta dilanjutkan dengan analisis asam amino dan asam lemak
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