title: Enhancement of hydrolysis of Chlorella vulgaris by hydrochloric acid.
abstract: Chlorella vulgaris is considered as one of the potential sources of biomass for bio-based products because it consists of large amounts of carbohydrates. In this study, hydrothermal acid hydrolysis with five different acids (hydrochloric acid, nitric acid, peracetic acid, phosphoric acid, and sulfuric acid) was carried out to produce fermentable sugars (glucose, galactose). The hydrothermal acid hydrolysis by hydrochloric acid showed the highest sugar production. C. vulgaris was hydrolyzed with various concentrations of hydrochloric acid [0.5-10 % (w/w)] and microalgal biomass [20-140 g/L (w/v)] at 121 °C for 20 min. Among the concentrations examined, 2 % hydrochloric acid with 100 g/L biomass yielded the highest conversion of carbohydrates (92.5 %) into reducing sugars. The hydrolysate thus produced from C. vulgaris was fermented using the yeast Brettanomyces custersii H1-603 and obtained bioethanol yield of 0.37 g/g of algal sugars.
authors.affiliation: Department of Chemical and Biological Engineering, Korea University, 145, Anam-Ro, Seongbuk-Gu, Seoul, 136-701, Republic of Korea.
authors.forename: Charnho
authors.initials: C
authors.lastname: Park
authors.affiliation: Department of Chemical and Biological Engineering, Korea University, 145, Anam-Ro, Seongbuk-Gu, Seoul, 136-701, Republic of Korea.
authors.forename: Ja Hyun
authors.initials: JH
authors.lastname: Lee
authors.affiliation: Department of Chemical and Biological Engineering, Korea University, 145, Anam-Ro, Seongbuk-Gu, Seoul, 136-701, Republic of Korea.
authors.forename: Xiaoguang
authors.initials: X
authors.lastname: Yang
authors.affiliation: Department of Chemical and Biological Engineering, Korea University, 145, Anam-Ro, Seongbuk-Gu, Seoul, 136-701, Republic of Korea.
authors.forename: Hah Young
authors.initials: HY
authors.lastname: Yoo
authors.affiliation: Department of Chemical and Biological Engineering, Korea University, 145, Anam-Ro, Seongbuk-Gu, Seoul, 136-701, Republic of Korea.
authors.forename: Ju Hun
authors.initials: JH
authors.lastname: Lee
authors.affiliation: Department of Chemical and Biological Engineering, Korea University, 145, Anam-Ro, Seongbuk-Gu, Seoul, 136-701, Republic of Korea.
authors.forename: Soo Kweon
authors.initials: SK
authors.lastname: Lee
authors.affiliation: Department of Chemical and Biological Engineering, Korea University, 145, Anam-Ro, Seongbuk-Gu, Seoul, 136-701, Republic of Korea. kimsw@korea.ac.kr.
authors.forename: Seung Wook
authors.initials: SW
authors.lastname: Kim
mesh_terms: D048408:Chlorella vulgaris / Q000378:metabolism*; D005285:Fermentation; D006851:Hydrochloric Acid / Q000378:metabolism*; D006868:Hydrolysis
chemical_list: D006851:Hydrochloric Acid
keywords: Acid hydrolysis; Bioethanol; Brettanomyces custersii; Chlorella vulgaris; Fermentable sugars