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A comparative study of Sargassum species from the Yucatan peninsula coast: morphological and chemical characterisation
Phycologia ( IF 1.5 ) Pub Date : 2020-05-01 , DOI: 10.1080/00318884.2020.1738194
Luis Alberto Rosado-Espinosa 1 , Yolanda Freile-Pelegrín 1 , Emanuel Hernández-Nuñez 1 , Daniel Robledo 1
Affiliation  

ABSTRACT Several species of Sargassum have been reported from the Yucatan peninsula coast, many of which end up as beach cast material, accumulating on the coast during colder months. The phenotypic plasticity of Sargassum makes specimen identification difficult. Two approaches were used in the current study to corroborate identification of the most abundant species: traditional taxonomic characters, and chemical characterisation. Fresh material from eight species of Sargassum was collected on the Yucatan coast. Specimens were identified using the following morphological features: cryptostomata, blade shape and size, and the shape of floating vesicles. Two cell wall polysaccharides, alginate and fucoidan, were extracted, quantified, and characterised from five of the eight species collected. Organic extracts were prepared and GC–MS analyses were performed on the three most abundant species, looking for species-specific compounds. Our analysis identified different chemical constituents depending on the solvent used. In the dichloromethane fraction, hexanoic acid, 2-ethyl was obtained from S. buxifolium whereas benzyl benzoate and epistephamiersine were found in S. hystrix. For the latter species, cholesta-4,6-dien-3-ol, (á)- was found in the hexane fraction, whereas 2,2ʹ-ethyldenebis(4,6- di-tert-butylphenol) and 2-pentadecanone, 6,10,14-trimethyl- were present in S. fluitans. We discuss the applicability and usefulness of this method to assist taxonomic identification of Sargassum species.

中文翻译:

尤卡坦半岛海岸马尾藻物种的比较研究:形态和化学特征

摘要 尤卡坦半岛海岸已经报道了几种马尾藻,其中许多最终成为海滩铸造材料,在寒冷的月份堆积在海岸上。马尾藻的表型可塑性使标本鉴定变得困难。当前研究中使用了两种方法来证实最丰富物种的鉴定:传统分类特征和化学特征。在尤卡坦海岸收集了八种马尾藻的新鲜材料。使用以下形态特征鉴定标本:隐孔、叶片形状和大小以及漂浮囊泡的形状。从收集的八种物种中的五种中提取、量化和表征两种细胞壁多糖,藻酸盐和岩藻多糖。制备有机提取物并对三种最丰富的物种进行 GC-MS 分析,寻找物种特异性化合物。我们的分析根据所使用的溶剂确定了不同的化学成分。在二氯甲烷馏分中,从 S. buxifolium 中获得了己酸 2-乙基,而在 S. hystrix 中发现了苯甲酸苄酯和表链霉素。对于后一种物质,在己烷馏分中发现了 cholesta-4,6-dien-3-ol, (á)-,而 2,2ʹ-乙二烯双(4,6-二叔丁基苯酚)和 2-十五烷酮, 6,10,14-三甲基-存在于 S.fluitans 中。我们讨论了这种方法在帮助马尾藻物种的分类鉴定方面的适用性和实用性。我们的分析根据所使用的溶剂确定了不同的化学成分。在二氯甲烷馏分中,从 S. buxifolium 中获得了己酸 2-乙基,而在 S. hystrix 中发现了苯甲酸苄酯和表链霉素。对于后一种物质,在己烷馏分中发现了 cholesta-4,6-dien-3-ol, (á)-,而 2,2ʹ-乙二烯双(4,6-二叔丁基苯酚)和 2-十五烷酮, 6,10,14-三甲基-存在于 S.fluitans 中。我们讨论了这种方法在帮助马尾藻物种的分类鉴定方面的适用性和实用性。我们的分析根据所使用的溶剂确定了不同的化学成分。在二氯甲烷馏分中,从 S. buxifolium 中获得了己酸 2-乙基,而在 S. hystrix 中发现了苯甲酸苄酯和表链霉素。对于后一种物质,在己烷馏分中发现了 cholesta-4,6-dien-3-ol, (á)-,而 2,2ʹ-乙二烯双(4,6-二叔丁基苯酚)和 2-十五烷酮, 6,10,14-三甲基-存在于 S.fluitans 中。我们讨论了这种方法在帮助马尾藻物种的分类鉴定方面的适用性和实用性。S.fluitans 中存在 2ʹ-亚乙基双(4,6-二叔丁基苯酚)和 2-十五烷酮,6,10,14-三甲基-。我们讨论了这种方法在帮助马尾藻物种的分类鉴定方面的适用性和实用性。S.fluitans 中存在 2ʹ-亚乙基双(4,6-二叔丁基苯酚)和 2-十五烷酮,6,10,14-三甲基-。我们讨论了这种方法在帮助马尾藻物种的分类鉴定方面的适用性和实用性。
更新日期:2020-05-01
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