*3.3. Elemental Analysis*

Total carbon, nitrogen, and sulfur (C, N, S) content (in wt.%, approximately 100 mg per sample) were measured using an Elementary Chemical Analyzer LECO CHNS-932.

### *3.4. Polar Solvent Extraction*

Lyophilized samples of total jellyfish were subjected to extraction in aqueous solvent PBS. Samples were stirred with 16 volumes of PBS (2 h at 4 ◦C). Samples were then centrifuged at 9000× *g* for 30 min at 4 ◦C and the supernatants were essayed for protein and phenol contents and for antioxidant activity.
