In recent years, the interest in using seaweed for the sustainable production of commodities has been increasing as seaweeds contain many potentially worthwhile compounds. Thus, the extraction and refining processes of interesting compounds from seaweeds is a hot research topic but has been found to have problems with profitability for novel applications. To increase the economic potential of refining seaweed biomass, the content of the compounds of interest should be maximized, which can potentially be achieved through optimization of cultivation conditions. In this study, we studied how the monosaccharide composition of the green seaweed species Ulva fenestrata is influenced by the abiotic factors; irradiance, temperature, nitrate, phosphate, and pCO₂. It was evident that lower nitrate concentration and cultivation at elevated temperature increased monosaccharide contents. A 70% increase in iduronic acid and a 26% increase in rhamnose content were seen under elevated irradiance and temperature conditions, though the absolute differences in monosaccharide concentration were small. Irradiance and nitrate impacted the ratio between iduronic and rhamnose, which is an indicator of the ulvan structure. These results could potentially be utilized to coax the ulvan towards specific bioactivities, and thus have a considerable impact on a potential biorefinery centered around Ulva.

近年来，由于海藻中含有许多潜在有价值的化合物，因此人们越来越关注将海藻用于商品的可持续生产。因此，从海藻中提取和精制有趣的化合物的过程是一个热门的研究课题，但已发现其在新应用中的获利能力存在问题。为了增加精炼海藻生物质的经济潜力，应最大程度地提高目标化合物的含量，这可以通过优化栽培条件来实现。在这项研究中，我们研究了非生物因素如何影响绿海藻物种Ulva fenestrata的单糖组成。辐照度，温度，硝酸盐，磷酸盐和pCO ₂。显然，较低的硝酸盐浓度和在高温下培养会增加单糖含量。尽管单糖浓度的绝对差异很小，但在较高的辐照度和温度条件下，艾杜糖醛酸含量增加了70％，鼠李糖含量增加了26％。辐照度和硝酸盐影响了艾杜糖醛和鼠李糖之间的比率，这是ulvan结构的指标。这些结果可能被用来哄向特定生物活性的ulvan，从而对周围为中心的潜在生物炼制相当大的影响石莼。