Gallagher J A, Adams J M M, Turner L B, Kirby M E, Toop T A, Mirza M W, Theodorou M K
Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Gogerddan, Aberystwyth, Ceredigion SY23 3EE UK.
Agricultural Centre for Sustainable Energy Systems, Department of Agriculture and the Environment, Harper Adams University, Newport, Shropshire, TF10 8NB UK.
J Appl Phycol. 2021;33(1):533-544. doi: 10.1007/s10811-020-02295-x. Epub 2020 Oct 19.
Red algae, belonging to the phylum Rhodophyta, contain an abundance of useful chemicals including bioactive molecules and present opportunities for the production of different products through biorefinery cascades. The rhodophyte , commonly termed dulse or dillisk, grows predominantly on the northern coasts of the Atlantic and Pacific Oceans and is a well-known snack food. Due to its abundance, availability and cultivation capacity, was selected for study as a potential candidate for a biorefinery process. In addition to studying juice and solid fractions of freshly harvested , we have investigated the novel possibility of preserving algal biomass by ensilaging protocols similar to those employed for terrestrial forage crops. In the metabolite partitioning within the solid and liquid fractions following screw-pressing, the majority of the metabolites screened for-water soluble carbohydrates, proteins and amino acids, lipids, pigments, phenolics and antioxidant activity-remained in the solid fraction, though at differing proportions depending on the metabolite, from 70.8% soluble amino acids to 98.2% chlorophyll and 98.1% total carotenoids. For the ensiling study, screw-pressed , with comparative wilted and chopped, and chopped only samples, were ensiled at scale with and without Safesil silage additive. All samples were successfully ensiled after 90 days, with screw-pressing giving lower or equal pH before and after ensiling compared with the other preparations. Of particular note was the effluent volumes generated during ensiling: 26-49% of the fresh weight, containing 16-34% of the silage dry matter. This may be of advantage depending on the final use of the biomass.
红藻属于红藻门，含有大量有用的化学物质，包括生物活性分子，为通过生物炼制级联生产不同产品提供了机会。这种红藻，通常称为掌状红皮藻或dilisk，主要生长在大西洋和太平洋的北部海岸，是一种著名的休闲食品。由于其数量丰富、易于获取和具备种植能力，它被选作生物炼制过程的潜在候选对象进行研究。除了研究新鲜收获的红藻的汁液和固体部分外，我们还研究了采用类似于陆地饲料作物的青贮方案保存藻类生物质的新可能性。在螺旋压榨后的固体和液体部分的代谢物分配中，所筛选的大多数代谢物——水溶性碳水化合物、蛋白质和氨基酸、脂质、色素、酚类物质和抗氧化活性——都保留在固体部分，不过根据代谢物的不同，其比例也有所不同，从70.8%的可溶性氨基酸到98.2%的叶绿素a和98.1%的总类胡萝卜素。对于青贮研究，将螺旋压榨后的红藻与经过比较的萎蔫切碎和仅切碎的样品，在有和没有Safesil青贮添加剂的情况下进行大规模青贮。所有样品在90天后都成功青贮，与其他制备方法相比，螺旋压榨后的样品在青贮前后的pH值较低或相等。特别值得注意的是青贮过程中产生的流出物体积：占鲜重的26 - 49%，含有青贮干物质的16 - 34%。这可能根据生物质的最终用途而具有优势。
