What question did this study set out to answer?

To analyze the macronutrient content of various marine macroalgae from the eastern Philippine coast.

April 28, 2026Open Access

Nutritional profiling of 30 tropical marine macroalgae on an eastern Philippine coast: insights into macronutrient content

Key Points

To analyze the macronutrient content of various marine macroalgae from the eastern Philippine coast.
Collected 30 marine macroalgae samples from Caramoan, Philippines.
Measured total soluble carbohydrates, total phenolic content, and protein content using colorimetric techniques.
Performed Principal Component Analysis (PCA) to distinguish biochemical composition by taxonomic group and functional form.
Red seaweeds had the highest total soluble carbohydrates at 0.962 ± 0.080%.
Brown seaweeds exhibited the highest total phenolic content at 0.047 ± 0.004%, while green seaweeds had the highest protein content at 1.783 ± 0.065%.
Principal Component Analysis indicated biochemical composition is distinguishable by seaweed taxonomic group and functional forms.

Abstract

Abstract The biochemical composition of 11 green, 10 brown, and 9 red seaweeds collected from Caramoan, Camarines Sur, Philippines, was measured. Total soluble carbohydrates (TSC), total phenolic content (TPC), and protein content (PC), presented as percent (%) fresh weight (FW), were measured colorimetrically. Red seaweeds had the highest TSC (0.962 ± 0.080 %), while the highest TPC (0.047 ± 0.004 %) and PC (1.783 ± 0.065 %) were noted in brown and green seaweeds, respectively. TSC was highest in Gelidiella acerosa (2.054 ± 0.098 %) and Chaetomorpha linum (1.364 ± 0.064 %). The highest TPC was recorded in Hormophysa cuneiformis (0.103 ± 0.011 %) and Padina sp. (0.102 ± 0.009 %), while the highest PC was found in Halimeda discoidea (2.768 ± 0.076 %) and Halimeda macroloba (2.694 ± 0.012 %). Fleshy seaweeds had higher TSC (0.672 ± 0.058 %) and TPC (0.042 ± 0.002 %), while calcifying seaweeds had higher PC (1.702 ± 0.052 %). PCA revealed that seaweed biochemical composition can be distinguished by their taxonomic group and functional form. Our findings suggest that seaweeds from Caramoan with good nutritive content present opportunities for further research on their potential applications for human (e.g., functional foods, nutra- and pharmaceutical importance) and non-human products (e.g., animal feeds and plant nutrition).

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