Process Intensification Approaches for the Extraction of Pigments from Microalgae: Advanced Technologies
摘要
Currently microalgae are in significant focus as a potential source for value added products like pigments, lipids, and carbohydrates. Microalgae can be grown quickly without competition to food chain on non-arable land with lesser requirement of nutrients and beneficial utilization of greenhouse gas (GHG). Among the different value added products from microalgae, pigment offer immense potential. Chlorophylls, carotenoids, and phycobiliproteins are the classes of pigments found in varied proportions in different microalgae strains. Zeaxanthin, astaxanthin, fucoxanthin, lutein, chlorophyll a, and carotenes are some of the specific commercially important pigments possessing higher value in food and pharmaceutical industry market. It is important to note that the conventional pigment extraction processes such as bead beating, homogenizers, etc. have not been very successful at commercial level due to high costs. Thus, evaluating process intensification approaches for increased process efficiency are necessary. Process intensification plays a crucial role in minimizing process cost with significant reduction in quantum of chemicals required and processing time. The current chapter focuses on presenting overview of novel intensified separations with consideration of the governing mechanisms, set of best operating conditions, and also detailed literature review to highlight the obtained benefits. It is demonstrated that significant intensification benefits are obtained based on the application of newer approaches and scaling it up to commercial scale will indeed lead to favorable economics for the recovery of pigments from microalgae.