Sea Lettuce (Ulva lactuca): Sulfated Ulvan Heteropolysaccharides, Colonic Microbiome Fermentation, and Vascular Nitric Oxide

The Emerald Ribbons of Global Rocky Shores

Forming delicate, translucent emerald-green sheets in pristine ocean tidepools worldwide, Sea Lettuce (Ulva lactuca) resembles terrestrial garden lettuce leaves but thrives immersed in ocean mineral brine.

1. Sulfated Ulvan Polysaccharides

• Ulvan ($\approx 30–40\%$ of dry weight): Unique sulfated heteropolysaccharides composed of rhamnose, glucuronic acid, and xylose that resist human upper gastric enzymes.
• Microbiome SCFA Boost: Selectively fermented by distal gut anaerobic bacteria, increasing colonic acetate and butyrate concentrations.
• Vascular Nitric Oxide Stimulation: Promotes smooth arterial muscle relaxation.

2. References & Clinical Citations

• Lahaye, M., & Robic, A. (2007). Structure and function properties of Ulvan, a polysaccharide from green seaweeds. Biomacromolecules, 8(6), 1765-1774. [PubMed: 17469832]
• Berri, M., et al. (2016). Ulvan from Ulva lactuca stimulates immune gene expression in intestinal epithelial cells. Journal of Applied Phycology, 28(5), 2999-3008.

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