Structural characterization and antioxidant activity of polysaccharide from Rhodomyrtus tomentosa berry

Citation

Li, Dingjin and Wan Ibadullah, Wan Zunairah and Shukri, Radhiah and Duan, Qiuxia and Gu, Yipeng and Mustapha, Nor Afizah (2025) Structural characterization and antioxidant activity of polysaccharide from Rhodomyrtus tomentosa berry. Food Chemistry, 484. art. no. 144150. pp. 1-14. ISSN 0308-8146; eISSN: 1873-7072

Abstract

This study explored the structural properties and in vitro antioxidant activity of polysaccharide (RTP-1) from Rhodomyrtus tomentosa berry. The average molecular weight of RTP-1 is 11.638 kDa. Structural characterization revealed that the main chain of RTP-1 composed of 4,6)-β-D-Manp-(1 → and 6)-β-D-Manp-(1 → linkages, and the branched chain is the D-Galp-(1 → attached to the O-6 position of the glycan residue →4,6)-β-D-Manp-(1→). There is no triple helix structure in RTP-1. X-ray diffractometer results showed that RTP-1 is an amorphous semi-crystalline polymer with a characteristic “bun” shaped peak and a crystalline region at 20.42°. Atomic force microscopy results revealed that the average height of RTP-1 was 5.52 nm. The scanning electron microscopy results showed that RTP-1 exhibited a rough surface with numerous tiny pores. Thermo-gravimetry analysis and differential scanning colorimeter results revealed that RTP-1 was extremely thermally stable. The RTP-1 exhibited excellent 1,1-diphenyl-2-picrylhydrazyl (DPPH), 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid (ABTS), and OH radical scavenging activity.

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Additional Metadata

Item Type:	Article
Subject:	Analytical Chemistry
Subject:	Food Science
Divisions:	Faculty of Food Science and Technology
DOI Number:	https://doi.org/10.1016/j.foodchem.2025.144150
Publisher:	Elsevier
Keywords:	Antioxidant activity; Average molecular weight; Neutral polysaccharide; Nuclear magnetic resonance; Rhodomyrtus tomentosa berry; Thermal properties
Sustainable Development Goals (SDGs):	SDG 3: Good Health and Well-being, SDG 12: Responsible Consumption and Production, SDG 15: Life on Land
Depositing User:	Ms. Nur Faseha Mohd Kadim
Date Deposited:	25 Jun 2026 05:58
Last Modified:	25 Jun 2026 05:58
Altmetrics:	http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.foodchem.2025.144150
URI:	http://psasir.upm.edu.my/id/eprint/123243
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