Cha, Jaehyun Lim, Chang -Hun Lee, Jeongmi Lim, Jin-Kyu Kim, Minyoung Park, Won-Kun Sung, Changmin Kim, Hyun-Kyung Min, Kyoungseon 2024-06-13T01:30:26Z 2024-06-13T01:30:26Z 2024-06-13 2024-06 1385-8947 https://pubs.kist.re.kr/handle/201004/150053 Mankind is facing a severe climate crisis caused by fossil fuel-derived CO2 emissions. Although biorefineries utilizing biomass have been considered the best option for carbon-neutrality, most biorefinery-derived products have not yet been promising for economic feasibility; various strategies have been developed to increase economic competitiveness, and zero-waste biorefineries are challenging options. Herein, we aim to develop an algal biomass-based zero-waste biorefinery for producing enantioselective (R)-gamma-valerolactone ((R)-GVL) and carbonaceous electrodes applicable for Li-ion batteries (LiBs). Various algal biomasses were hydrothermally oxidized to produce levulinic acid (LA) as an intermediate for producing (R)-GVL, resulting that Gracilaria verrucosa was selected as feedstock. For the hydroxylation of G. verrucosa-derived LA to 4-hydroxyvaleric acid (4-HV), 3-hydroxybutyrate dehydrogenase (HBDH) was explored through genome mining and further engineered. The engineered HBDH successfully converted G. verrucosa-derived LA to 4-HV, which was subsequently lactonized under acidic conditions, resulting in optically pure (R)-GVL. To our knowledge, this is the first report of the production of an algal biomass-derived enantioselective (R)-GVL with a perfect enantiomeric excess (>99.99 %) that can be used as a precursor for more valuable biopharmaceuticals and bioplastics than biofuels. Furthermore, residual G. verrucosa after hydrothermal oxidation was used as a carbonaceous anode material for LIBs for the first time; hard carbon anodes, which were prepared through simple heat treatment (800 degree celsius, 3 h, argon atmosphere), exhibit good capacities of 231, 191, 133, 108, 97 and 86 mAh/g at 0.05, 0.1, 0.5, 1, 1.5, and 2 A/g, respectively. The results discussed herein can provide insights into zero-waste biorefineries applicable for diverse industrial fields (e.g., biopolymer, biopharmaceutical and energy storage) and contribute to the construction of closed-carbon-loops for coping with climate change. English Elsevier BV Algal biomass-based zero-waste biorefinery for producing optically pure (R)-γ-valerolactone and carbonaceous electrodes applicable for energy storage devices Article 10.1016/j.cej.2024.151713 1 Chemical Engineering Journal, v.490 Chemical Engineering Journal 490 Y scie scopus 001237902400001 2-s2.0-85191662766 Engineering, Environmental Engineering, Chemical Engineering Article GAMMA-VALEROLACTONE SUBSTRATE-SPECIFICITY GRACILARIA-VERRUCOSA RED MACROALGA FORMIC-ACID CONVERSION CATALYST HYDROGENATION OPTIMIZATION LEVULINIC ACID Zero -waste biorefinery Algal biomass Optically pure ( R )-GVL production Residual biomass -derived carbon anode for LIBs