Effects of different culture media on growth, composition, quality and palatability of the green algae Ulva sp. cultivated in cylindrical photobioreactors

IF 4.6 2区 生物学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY Algal Research-Biomass Biofuels and Bioproducts Pub Date : 2024-10-18 DOI:10.1016/j.algal.2024.103749
Viviana Pasquini , Cecilia Biancacci , Massimo Milia , Davide Moccia , Paolo Solari , Alberto Angioni , Pierantonio Addis
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Abstract

Ulva spp. are valuable seaweeds with recognized commercial applications, including food, feed, and ecosystem services. Ensuring a sustainable and consistent supply of biomass with desirable profiles aligned with intended uses is fundamental for the successful applications of this seaweed. In this study, the growth rate, morphology, physiology, and composition of Ulva sp. produced by propagation in indoor cylindrical photobioreactors using four different culture media (lagoon water - LW, lagoon water enriched with Guillard medium (LF), with sea urchin wastewater - LU, and cow digestate - LD) was assessed; moreover, the nutrient uptake potential of the species was evaluated. The palatability and attractivity of the produced biomass towards the sea urchin Paracentrotus lividus were investigated. It was found that the media influenced all the parameters examined, the LF biomass weight was double compared to the other treatments and showed a slightly higher absorbance. Colorimetric analyses reported a significant darker color in Ulva sp. grown under enriched media. Ulva sp. showed higher nutrient removal potential in LF. The lipid content did not vary (2–3 % dry weight, DW), while the protein content ranged from 21 % in LF to 6–9 % in the other treatments. Carbohydrates and fiber content were significantly lower in LF (16 % and 30 %) compared to the other treatments, 27–34 %, and 41–48 %, respectively. Pigment content significantly varied, being higher in biomass grown in LF and LU. Sea urchins showed preferences for biomass grown under LU, followed by LD. This study shows how different nutrient sources affect the biochemical composition, growth, quality, and palatability of Ulva sp.. When cultivated under the synthetic enriched media (LF) the species exhibits characteristics better suitable for human consumption, although requiring a higher economic investment for production, while biomass derived from wastewater nutrients (LD, LU) confirms potential applications of the seaweed as valuable feed and for bioremediation services.

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不同培养基对圆柱形光生物反应器中培养的绿藻莼菜的生长、成分、质量和适口性的影响
石莼是一种珍贵的海藻,具有公认的商业用途,包括食品、饲料和生态系统服务。要成功应用这种海藻,最根本的是要确保可持续且稳定地供应符合预期用途的生物质。本研究评估了在室内圆柱形光生物反应器中使用四种不同培养基(泻湖水 - LW、富含吉拉德培养基(LF)的泻湖水、海胆废水 - LU 和奶牛沼渣 - LD)繁殖生产的莼菜的生长速度、形态、生理和成分;此外,还评估了该物种的营养吸收潜力。研究还调查了所产生的生物质对海胆(Paracentrotus lividus)的适口性和吸引力。结果发现,培养基对所有检测参数都有影响,LF 生物质重量是其他处理的两倍,吸光度也略高。色度分析表明,在富集培养基下生长的石莼颜色明显较深。在 LF 中生长的石莼具有更高的营养物质去除潜力。脂质含量没有变化(2-3 % 干重),而蛋白质含量从低浓度培养基的 21 % 到其他处理的 6-9 % 不等。与其他处理(分别为 27-34 % 和 41-48 %)相比,低浓度处理的碳水化合物和纤维含量明显较低(分别为 16 % 和 30 %)。色素含量也有明显差异,LF 和 LU 生长的生物质色素含量较高。海胆表现出对 LU 生长的生物质的偏好,其次是 LD。这项研究显示了不同营养源如何影响莼菜的生化组成、生长、质量和适口性。在合成富集培养基(LF)下培养的莼菜虽然需要较高的生产经济投资,但其特性更适合人类食用,而从废水营养物(LD、LU)中提取的生物质则证实了这种海藻作为有价值的饲料和生物修复服务的潜在应用价值。
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来源期刊
Algal Research-Biomass Biofuels and Bioproducts
Algal Research-Biomass Biofuels and Bioproducts BIOTECHNOLOGY & APPLIED MICROBIOLOGY-
CiteScore
9.40
自引率
7.80%
发文量
332
期刊介绍: Algal Research is an international phycology journal covering all areas of emerging technologies in algae biology, biomass production, cultivation, harvesting, extraction, bioproducts, biorefinery, engineering, and econometrics. Algae is defined to include cyanobacteria, microalgae, and protists and symbionts of interest in biotechnology. The journal publishes original research and reviews for the following scope: algal biology, including but not exclusive to: phylogeny, biodiversity, molecular traits, metabolic regulation, and genetic engineering, algal cultivation, e.g. phototrophic systems, heterotrophic systems, and mixotrophic systems, algal harvesting and extraction systems, biotechnology to convert algal biomass and components into biofuels and bioproducts, e.g., nutraceuticals, pharmaceuticals, animal feed, plastics, etc. algal products and their economic assessment
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