Bioplastics are biomaterial-derived plastics and are superior to petrochemical-based plastics in terms of resource renewability, planetary sustainability, and environmental biodegradability. Extensive research has been carried out over the last decades to identify and characterize desirable biomaterials for bioplastic manufacturing, and among those explored, microalgal biomass has received special attention due to its numerous advantages over other bioresources, including high areal productivity, the potential to use non-arable land, and the ability to reduce waste. Nonetheless, the cultivation and biorefinery processes for microalgae still need innovative development to make microalgal bioplastics economically viable. The primary focus of this review is to examine the established and emerging technologies for manufacturing bioplastics from microalgal biomass, starting from the exploration of bioresource availability and outlining technical routes of production. In particular, both upstream and downstream processes of microalgal cultivation pertinent to bioplastic production are reviewed in detail, analyzed in depth, and evaluated from the perspective of economic viability. The technical challenges and research opportunities, as well as prospects of current approaches and future methodologies for microalgal production of bioplastics, are also discussed, mostly based upon our research experiences in microalgal bioengineering, and it is our opinion that, despite these existing challenges, microalgal biomass could still be one of the most promising feedstocks for sustainable manufacturing of bioplastics.
Cell-free gene expression (CFE) technology is an appealing expression chassis for fieldable synthetic biology. Reagents for cell-free protein expression can be preserved, transported, or stored over long periods, even at elevated temperatures. Therefore, cell-free synthetic biology efforts are practical for applications such as fieldable biosensing and decentralized or on-demand therapeutics production in austere environments and at emergency or natural disaster sites. However, these systems still require incubation to operate under standard conditions (e.g., 16 °C to 37 °C), whereas the conditions in the application environment often lie outside these limits. To address this technological gap, we propose adding heat-shock chaperones from diverse organisms to expand the cell-free system’s operating range. We present a method for assessing protective protein candidates, and we demonstrate a 100-fold improvement in fluorescent reporter expression at non-standard temperatures and a widening of the temperature range for system operation by more than 4 °C, as measured by fluorescence from reporter expression. Moreover, we show that dual-chaperone systems can yield higher fluorescence output compared to single-chaperone ones. These chaperone-inspired systems may perform in environments where standard ones fall short, expanding their usability and application potential.
