1
|
Wang W, Sun Y, Peng P, Gu G, Du G, Xu L, Xiao M. Two-Step Enzymatic Conversion of Rebaudioside A into a Mono-α-1,4-Glucosylated Rebaudioside A Derivative. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:2522-2530. [PMID: 33620213 DOI: 10.1021/acs.jafc.0c07452] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
A new two-step enzymatic conversion process for the production of a novel mono-α-1,4-glucosylated rebaudioside A derivative (RA1G) was established via transglycosylation followed by hydrolyzation. In the transglycosylation reaction catalyzed by cyclodextrin glycosyltransferase, rebaudioside A (RA) was converted into glucosylated RA derivatives (RAGs), and the maximum conversion of 87.8% was obtained with the optimal conditions of 2 U/mL enzyme, 82.5 mg/mL β-cyclodextrin, and 82.5 mg/mL RA at 60 °C for 5 h. The obtained RAG solution was then directly used in hydrolyzation. Four amylases were screened for shortening the newly synthesized α-glucans of RAGs. A glucoamylase was found to produce RA1G as the single glucosylated product, and the maximum yield of 53.3% was achieved with the optimal conditions of adding 1.5 U/mL glucoamylase into RAG solution at 60 °C for 3 h. RA1G was identified as 13-[(2-O-β-D-glucopyranosyl-3-O-β-D-glucopyranosyl-β-D-glucopyranosyl) oxy] ent-kaur-16-en-19-oic acid-[(4-O-α-D-glucopyranosyl-β-D-glucopyranosyl) ester] by MS and NMR analysis and showed an improved sensory quality compared to RA.
Collapse
Affiliation(s)
- Wenzheng Wang
- State Key Lab of Microbial Technology, National Glycoengineering Research Center, Shandong Key Laboratory of Carbohydrate Chemistry and GlycobiologyShandong University, Qingdao 266237, P. R. China
| | - Yajing Sun
- State Key Lab of Microbial Technology, National Glycoengineering Research Center, Shandong Key Laboratory of Carbohydrate Chemistry and GlycobiologyShandong University, Qingdao 266237, P. R. China
| | - Peng Peng
- State Key Lab of Microbial Technology, National Glycoengineering Research Center, Shandong Key Laboratory of Carbohydrate Chemistry and GlycobiologyShandong University, Qingdao 266237, P. R. China
| | - Guofeng Gu
- State Key Lab of Microbial Technology, National Glycoengineering Research Center, Shandong Key Laboratory of Carbohydrate Chemistry and GlycobiologyShandong University, Qingdao 266237, P. R. China
| | - Guoying Du
- Dongtai Hirye Biotechnology Co., ltd., Dongtai, Jiangsu 224237, P. R. China
| | - Li Xu
- State Key Lab of Microbial Technology, National Glycoengineering Research Center, Shandong Key Laboratory of Carbohydrate Chemistry and GlycobiologyShandong University, Qingdao 266237, P. R. China
| | - Min Xiao
- State Key Lab of Microbial Technology, National Glycoengineering Research Center, Shandong Key Laboratory of Carbohydrate Chemistry and GlycobiologyShandong University, Qingdao 266237, P. R. China
| |
Collapse
|
2
|
Senila L, Kovacs E, Scurtu DA, Cadar O, Becze A, Senila M, Levei EA, Dumitras DE, Tenu I, Roman C. Bioethanol Production from Vineyard Waste by Autohydrolysis Pretreatment and Chlorite Delignification via Simultaneous Saccharification and Fermentation. Molecules 2020; 25:molecules25112606. [PMID: 32503355 PMCID: PMC7321332 DOI: 10.3390/molecules25112606] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 05/26/2020] [Accepted: 06/01/2020] [Indexed: 12/05/2022] Open
Abstract
In this paper, the production of a second-generation bioethanol from lignocellulosic vineyard cutting wastes was investigated in order to define the optimal operating conditions of the autohydrolysis pretreatment, chlorite delignification and simultaneous saccharification and fermentation (SSF). The autohydrolysis of vine-shoot wastes resulted in liquors containing mainly a mixture of monosaccharides, degradation products and spent solids (rich in cellulose and lignin), with potential utility in obtaining valuable chemicals and bioethanol. The autohydrolysis of the vine-shoot wastes was carried out at 165 and 180 °C for 10 min residence time, and the resulted solid and liquid phases composition were analysed. The resulted liquid fraction contained hemicellulosic sugars as a mixture of alpha (α) and beta (β) sugar anomers, and secondary by-products. The solid fraction was delignified using the sodium chlorite method for the separation of lignin and easier access of enzymes to the cellulosic sugars, and then, converted to ethanol by the SSF process. The maximum bioethanol production (6%) was obtained by autohydrolysis (165 °C), chlorite delignification and SSF process at 37 °C, 10% solid loading, 72 h. The principal component analysis was used to identify the main parameters that influence the chemical compositions of vine-shoot waste for different varieties.
Collapse
Affiliation(s)
- Lacrimioara Senila
- National Institute for Research and Development of Optoelectronics Bucharest INOE 2000, Research Institute for Analytical Instrumentation subsidiary, 67 Donath Street, 400293 Cluj-Napoca, Romania; (E.K.); (D.A.S.); (O.C.); (A.B.); (M.S.); (E.A.L.); (C.R.)
- Correspondence: ; Tel.: +40-264-420-590
| | - Eniko Kovacs
- National Institute for Research and Development of Optoelectronics Bucharest INOE 2000, Research Institute for Analytical Instrumentation subsidiary, 67 Donath Street, 400293 Cluj-Napoca, Romania; (E.K.); (D.A.S.); (O.C.); (A.B.); (M.S.); (E.A.L.); (C.R.)
- Faculty of Horticulture, University of Agricultural Sciences and Veterinary Medicine, 3-5 Manastur Street, 400372 Cluj-Napoca, Romania;
| | - Daniela Alexandra Scurtu
- National Institute for Research and Development of Optoelectronics Bucharest INOE 2000, Research Institute for Analytical Instrumentation subsidiary, 67 Donath Street, 400293 Cluj-Napoca, Romania; (E.K.); (D.A.S.); (O.C.); (A.B.); (M.S.); (E.A.L.); (C.R.)
| | - Oana Cadar
- National Institute for Research and Development of Optoelectronics Bucharest INOE 2000, Research Institute for Analytical Instrumentation subsidiary, 67 Donath Street, 400293 Cluj-Napoca, Romania; (E.K.); (D.A.S.); (O.C.); (A.B.); (M.S.); (E.A.L.); (C.R.)
| | - Anca Becze
- National Institute for Research and Development of Optoelectronics Bucharest INOE 2000, Research Institute for Analytical Instrumentation subsidiary, 67 Donath Street, 400293 Cluj-Napoca, Romania; (E.K.); (D.A.S.); (O.C.); (A.B.); (M.S.); (E.A.L.); (C.R.)
| | - Marin Senila
- National Institute for Research and Development of Optoelectronics Bucharest INOE 2000, Research Institute for Analytical Instrumentation subsidiary, 67 Donath Street, 400293 Cluj-Napoca, Romania; (E.K.); (D.A.S.); (O.C.); (A.B.); (M.S.); (E.A.L.); (C.R.)
| | - Erika Andrea Levei
- National Institute for Research and Development of Optoelectronics Bucharest INOE 2000, Research Institute for Analytical Instrumentation subsidiary, 67 Donath Street, 400293 Cluj-Napoca, Romania; (E.K.); (D.A.S.); (O.C.); (A.B.); (M.S.); (E.A.L.); (C.R.)
| | - Diana Elena Dumitras
- Faculty of Horticulture, University of Agricultural Sciences and Veterinary Medicine, 3-5 Manastur Street, 400372 Cluj-Napoca, Romania;
| | - Ioan Tenu
- Faculty of Agriculture, University of Agricultural Sciences and Veterinary Medicine, 3 Mihail Sadoveanu Alley, 700490 Iasi, Romania;
| | - Cecilia Roman
- National Institute for Research and Development of Optoelectronics Bucharest INOE 2000, Research Institute for Analytical Instrumentation subsidiary, 67 Donath Street, 400293 Cluj-Napoca, Romania; (E.K.); (D.A.S.); (O.C.); (A.B.); (M.S.); (E.A.L.); (C.R.)
| |
Collapse
|