Fabricating Strong and Stiff Bioplastics from Whole Spirulina Cells

Since the 1950s, 8.3 billion tonnes (Bt) of virgin plastics have been produced, of which around 5 Bt have accumulated as waste in oceans and other natural environments, posing severe threats to entire ecosystems. The need for sustainable bio-based alternatives to traditional petroleum-derived plastics is evident. Bioplastics produced from unprocessed biological materials have thus far suffered from heterogeneous and non-cohesive morphologies, which lead to weak mechanical properties and lack of processability, hindering their industrial integration. Here, a fast, simple, and scalable process is presented to transform raw microalgae into a self-bonded, recyclable, and backyard-compostable bioplastic with attractive mechanical properties surpassing those of other biobased plastics such as thermoplastic starch. Upon hot-pressing, the abundant and photosynthetic algae spirulina forms cohesive bioplastics with flexural modulus and strength in the range 3–5 GPa and 25.5–57 MPa, respectively, depending on pre-processing conditions and the addition of nanofillers. The machinability of these bioplastics, along with self-extinguishing properties, make them promising candidates for consumer plastics. Mechanical recycling and fast biodegradation in soil are demonstrated as end-of-life options. Finally, the environmental impacts are discussed in terms of global warming potential, highlighting the benefits of using a carbon-negative feedstock such as spirulina to fabricate plastics.     

Influence of pressurised cryogenic nitrogen technology on Arthrospira platensis (spirulina) preservation during storage

In this study, preservation of spirulina using the new pressurised cryogenic nitrogen technology (PCN) was compared to classical methods used in laboratories and industry. Spirulina morphology was better preserved by PCN compared to unpressurised cryogeny and classical freezing at −20 °C that led to cells fragmentation. A 25% loss of Phycocyanin-C content against 60% were measured after 98 days storage for 6-Bar PCN process and frozen samples, respectively. The Total AntiOxidant Power (PAOT Liquid Technology^®) was used for determination of total antioxidant and oxidant power of spirulina extracts. PAOT value of PCN samples was 50% higher than the frozen sample. From ABTS measurements on PCN spirulina fractions sonicated or not, it was suggested that pressurisation at 6 bars allowed a better preservation of free antioxidants (outside the cells) due to replacement of oxygen by nitrogen in the frozen beads. After dehydration, phycocyanin-C content variation during storage at 20 °C and 33% RH showed higher loss for freeze-dried spirulina treated at 0 compared to 6 Bars.     

甘肃中部干旱区苦荞营养及强化螺旋藻挂面工艺研究

分析了甘肃中部干旱区苦荞粉营养成分,探讨了以螺旋藻粉强化苦荞挂面配方工艺,解决了苦荞面筋度差,难以加工成形的技术难题。加工而成的苦荞螺旋藻挂面营养更丰富均衡,药理调理作用更明显,是糖尿病病人的理想食品。     

3种不同二氧化硅对螺旋藻片可压性的影响

目的研究不同二氧化硅对螺旋藻片可压性的影响,选出最适合制备螺旋藻片的二氧化硅。方法以硬度、脆碎度和主压力为主要评价指标,关联工序总混、包衣的工艺顺应性作为辅助评价指标,分别采用沉淀法二氧化硅、凝胶法二氧化硅和气相法二氧化硅制备螺旋藻片,对比分析螺旋藻片的可压性,确认螺旋藻片的质量参数。结果二氧化硅对螺旋藻片的可压性是:沉淀法二氧化硅气相法二氧化硅凝胶法二氧化硅,沉淀法二氧化硅不符合螺旋藻片的工艺要求,气相法二氧化硅分散性较差。结论螺旋藻片中优先使用凝胶法二氧化硅,其可压性最佳。     

利用太阳能光生物反应器处理有机污水并培养饲料级螺旋藻实验研究

饲料业需要大量环保型纯天然免疫抗病促长饲料添加剂。螺旋藻是激活动物免疫系统的最佳纯天然免疫饲料添加剂之一。利用太阳能光生物反应器培养饲料级螺旋藻同时处理有机污水，既可降低污水处理成本，又可生产优质饲料级螺旋藻，变废为宝。     

从螺旋藻中提取β－胡萝卜素的研究

对以石油醚为溶剂从螺旋藻中提取β－胡萝卜素的工艺条件进行了研究。实验结果表明，最佳提取条件为：固液比１３０，提取时间５０ｍｉｎ，提取温度７０℃，且一次性提取有较高的提取率，其它色素在本实验条件下对提取β－胡萝卜素的干扰较小     

螺旋灌的工厂化养殖—影响产量和质量的几个关键因素的研究

研究了螺旋灌工厂化养殖中几个关键因素对产品产量和质量的影响,实验结果表明,阴雨天气,采收液循环培养和干燥温度对产品质量,产量都有明显影响,其中阴雨天对螺旋藻产量和质量影响为严重,循环利用采收过滤淬累旋灌不仅逐步降代产量,而且使得质量下降,适宜的喷雾干燥温度对保证螺旋藻中的光合色素类生物活性物质的稳定的稳定非常重要。     

钝顶螺旋藻营养酸奶工艺的研究

通过在原料乳中添加３．０％的螺旋藻干粉和３．０％的大豆蛋白粉，经过嗜热链球菌和保加利亚乳杆菌双菌种发酵，制得了酸度为８６°Ｔ、蛋白质含量高于５．６％，而脂肪含量低于１．２％、含有多种微量元素和维生素的乳酸饮料。并通过采用二级均质处理和严格控制发酵程度，解决了螺旋藻干粉分散性差和颜色易黄变的问题。制得的产品呈淡黄绿色，在口感和风味方面有了一定的改善，产品的营养价值得到了较大提高，并且具有营养保健作用。     

螺旋藻作为生物能源的研究进展

螺旋藻是目前发现的最优秀的纯天然蛋白质食品源,同时也是研究生物放氢的理想材料之一,因此螺旋藻作为生物能源的研究和开发具有诱人的发展前景。本文概述了螺旋藻生长和研究情况,重点介绍了螺旋藻氢酶的研究、产氢机理的研究进展以及作为能源应用开发目前存在的问题和解决办法,并从理论上展望了作为生物能源开发应用的前景。     

螺旋藻优质高产的新方法研究

螺旋藻是一种已有35亿年生命史的最古老的原核光合生物，已被联合国粮农组织（FAO）和世界卫生组织（WHO）誉为“21世纪最佳保健食品”。通过多年多点室内外试验研究，探明了TA乳粉促进螺旋藻优质高产的应用技术。在螺旋藻工厂化生产中，向养殖池添加TA0.01～0.02mg/L的TA乳粉，能促进螺旋藻的细胞分裂、增殖及藻丝生长，提高净光合速率和干物质积累，增强硝酸还原酶活力和呼吸强度，并显著提高蛋白质、氨基酸、藻蓝蛋白、β-胡萝卜素、叶绿素及类胡萝卜素等含量。在促进螺旋藻品质明显改善的同时，还能显著提高其生物产量，处理比对照的增产幅度可达1.19～1.76 g/d·m2，增产率20%～30%。用TA乳粉作为螺旋藻养殖的调节剂及其养殖工艺是一项新创举，并开拓了TA乳粉在微藻上应用研究的新领域，是促进螺旋藻优质高产的一种比较好的方法，应用前景十分广阔。