Marine algae contain carbohydrates, including polysaccharides, alongside proteins, pigments, lipids and inorganic constituents. The particular compounds and their proportions vary with the organism, growth conditions and material being examined. A result for dried whole algae therefore answers a different question from an analysis of a purified fraction or a commercial cosmetic ingredient.

For cosmetic developers, understanding what is in marine algae starts with identifying the sample behind the data. Is the specification describing harvested biomass, an extract, a fermentation-derived material or a diluted ingredient ready for formulation? That distinction helps explain apparently conflicting composition figures and makes supplier discussions more precise. The useful next step is to connect each reported component to its measurement method, concentration basis and intended role in the development project.

The Main Compound Groups Found in Marine Algae

Carbohydrates and Polysaccharides

Carbohydrates include individual sugars and larger molecules such as polysaccharides. In their 2021 Porphyridium extraction study, Li and colleagues identified glucose, xylose and galactose through analysis of a particular intracellular polysaccharide fraction. Those sugars describe the studied fraction; they are not a universal composition formula for marine algae.

A total-carbohydrate result answers a broader question than the identity or structure of a specific polysaccharide. For development work, keep the total quantity, sugar composition and identity of the target material separate.

Proteins, Pigments and Lipids

Li and colleagues’ 2019 study of Porphyridium purpureum SCS-02 measured B-phycoerythrin, a pigment protein, and fatty acids including eicosapentaenoic acid (EPA). These examples illustrate different components within the same studied organism.

Some reporting categories overlap. Phycoerythrin is part of the protein picture, so its measured amount should not automatically be added to total protein. Similarly, a fatty-acid profile describes the analysed fatty acids rather than the total lipid content of the original biomass.

Minerals and Other Constituents

Olsson and colleagues examined 22 seaweed species from the Swedish west coast in 2020. Their elemental analysis included sodium, potassium, calcium and magnesium, alongside other elements. They also measured ash: the residue remaining after a defined heating procedure. Ash and individual-element results describe different aspects of the sample.

Questions about the minerals or nutrients in red marine algae therefore need a defined species and material. Composition alone does not establish skin absorption or a topical benefit.

Why Algae Composition Varies

Species and Strain Differences

Treat the organism name as the starting point for comparison. Check whether two reports concern the same species, whether a strain is identified and whether comparable material was sampled. Comparing unrelated algae can be useful for exploring raw-material options, but it cannot establish the expected composition of one selected ingredient.

The Swedish study was a regional screening of samples collected during one summer. Its results are useful for discussing variation between the sampled seaweeds, rather than setting global composition ranges or commercial batch tolerances.

Growth Conditions and Nutrient Supply

Cultivation conditions also matter. In a 2019 study, Li and colleagues grew Porphyridium purpureum SCS-02 under different nitrogen supplies. Higher nitrogen favoured protein, B-phycoerythrin and EPA accumulation, while lower nitrogen increased intracellular carbohydrate and promoted extracellular polysaccharide secretion. Total lipid content was largely unaffected by nitrogen concentration in that experiment.

For a buyer, the practical question is how the supplier controls the characteristic relevant to the project. Ask which parameters are specified for the supplied ingredient and how they are measured. A cultivation study helps explain possible variation; it does not establish a supplier’s process or the composition of every material bearing the same genus name.

From Whole Algae to Selected Ingredient Fractions

What Extraction Retains and Separates

Processing creates another distinction between the original organism and the material entering a formula. Li and colleagues demonstrated this in a 2021 study using a sequence of cold-water, ethanol and hot-water extraction on Porphyridium biomass. Different stages recovered fractions containing pigment protein, lipids and polysaccharides, with co-extracted material remaining in the fractions.

This example makes three purchasing terms worth separating:

• Extract yield: how much extract is obtained from the starting material, on the stated basis.
• Recovery: how much of a target component is recovered relative to the amount initially present.
• Purity: how much of the recovered material consists of the target component, using the stated measurement.

A high yield does not, by itself, answer the purity question. When comparing technical sheets, request the definition behind each percentage before deciding that one ingredient is more concentrated.

Why a Ferment Requires Its Own Composition Data

A fermentation-derived ingredient should be assessed through information about the resulting commercial material. Its name alone does not reveal the retained biomass, soluble components, processing residues or subsequent dilution. These are questions for product-specific documentation.

The extraction study above is useful for understanding fractionation. It does not describe LANDIVINE’s manufacturing process or establish the composition of its ferment.

How to Read Composition Data Correctly

Dry Weight, Wet Weight and As-Supplied Values

The denominator is often the first source of confusion. A concentration expressed per gram of dry algae cannot be compared directly with a percentage in an aqueous ingredient. Establish what was weighed, whether moisture was excluded and which component was measured.

Consider this hypothetical calculation, using mass-based values:

The supplied liquid would contain 1% marker by weight. At 2% inclusion, the calculated marker concentration in the finished formula would be 0.02% by weight, assuming complete incorporation and no loss or degradation.

These are illustrative values, not LANDIVINE specifications or an addition recommendation. The calculation estimates concentration; it does not demonstrate efficacy or stability.

Total Content, Specific Markers and Test Methods

Method details can change what a figure means. In the Swedish study, protein was estimated from measured nitrogen using a conversion factor of five. A buyer should therefore establish whether another reported protein value uses the same basis before making a direct numerical comparison.

Apply the same discipline to supplier specifications: record the analyte, method, units, sample basis and acceptance range together. If the method changes, check whether historical results remain comparable. A batch number attached to an unexplained percentage is insufficient for a meaningful trend assessment.

Applying Composition Knowledge to a Cosmetic Ingredient Brief

LANDIVINE lists Reshield™ Porphyridium Zinc Ferment in its Marine Algae ingredient category, with the INCI Porphyridium / Zinc Ferment and a water-solution supply form. These details identify a commercial ingredient for review. Its public listing does not establish the concentrations discussed in the research examples above.

For a composition-focused enquiry, identify the component or marker relevant to your project, the concentration basis you need and the intended product format. Request available product-specific analytical information, specification limits and explanations of any zinc-related composition claims. Keep the separate question of finished-product performance for appropriate formulation and efficacy work.

To explore the material further, contact LANDIVINE with your ingredient requirements and the composition questions your team needs to resolve before evaluation.

Research References

• Olsson, Toth and Albers, 2020. Seaweed composition study. Journal of Applied Phycology. DOI: 10.1007/s10811-020-02145-w.
• Li and colleagues, 2019. Nitrogen supply and Porphyridium composition. Marine Drugs, 17(2), 124. DOI: 10.3390/md17020124.
• Li and colleagues, 2021. Fractional extraction of Porphyridium biomass. Foods, 10(9), 2164. DOI: 10.3390/foods10092164.