Table 3.

Lipids extracted and directly transesterified from microalgae by MW for biodiesel production.

Microalgal Strain	Dry/Wet Method	Solvents Used	Ratio (Solvent to Sample)	Volumes Added	Microwave Settings	Product & Yield	Energy Use (MJ/kg)	Ref.
Nannochloropsis sp.	Dry	Methanol:chloroform (1:2)	x	1 g of algae	2.45 GHz, 1100 W (70% power), 60 °C, 5 min (cycle mode: 21 s on, 9 s off)	32% biodiesel	x	[77]
Nannochloropsis salina	Dry	Methanol	1:9	2 g algae, 24 mL methanol, 2% KOH catalyst	2.45 GHz, 800 W (50% power), 60–64 °C, 6 min	80.13% FAMEs	127	[8]
Nannochloropsis salina	Dry	Methanol	1:15	3% KOH catalyst	1400 W, 1400 W, 10 min	40.03% DW FAMEs	x	[78]
Nannochloropsis salina	Wet	Ethanol	9:1	2 g algae, 18 mL ethanol	1400 W reduced to 800 W, 245–285 °C, 65–80 bar, 30 min	30.9% DW FAMEs	x	[79]
Chlorella sp.	Dry	Ethanol	12:1	4 g algae, 48 mL ethanol and 2% NaOH catalyst	700 W (50% power), 78 °C, 6 min	17.11% DW FAMEs	x	[70]
Mixed microalgal culture	Dry	Methanol	8:1	5 g algae, KFCaO catalyst, 40 mL methanol	2.45 GHz, 10–80 W, 60 °C, 45 min	58.12% biodiesel	x	[80]
Phaeodactylum tricornutum	Dry	Methoxide	12:1	5 g algae, 60 mL methoxide, 2% NaOH catalyst in methanol	2.45 GHz, 800 W, 1 bar, 4 min	52% biodiesel conversion efficiency	x	[81]

x stands for no information available or provided in the research papers surveyed.