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Highly Efficient Extraction of Ferulic Acid from Cereal Brans by a New Type A Feruloyl Esterase from Eupenicillium parvum in Combination with Dilute Phosphoric Acid Pretreatment

  • Liangkun Long
  • Lianqiu Wu
  • Qunying Lin
  • Shaojun DingEmail author
Article

Abstract

Feruloyl esterase (FAE) is a critical enzyme in bio-extraction of ferulic acid (FA) from plant cell wall. A new FAE (EpFAE1) encoding gene was isolated from Eupenicillium parvum and heterologously expressed in Pichia pastoris cells. Based on phylogenetic tree analysis, the protein EpFAE1 belongs to type A of the seventh FAE subfamily. Using methyl ferulate as substrate, the optimum temperature and pH for the catalytic activity of EpFAE1 were 50 °C and 5.5, respectively. The enzyme exhibited high stability at 50 °C, in a wide pH range (3.0–11.0), or in the presence of 2 M of NaCl. Together with the endo-xylanase EpXYN1, EpFAE1 released 72.32% and 4.00% of the alkali-extractable FA from de-starched wheat bran (DSWB) or de-starched corn bran (DSCB), respectively. Meanwhile, the substrates were pretreated with 1.75% (for DSWB) or 1.0% (for DSCB) of phosphoric acid (PA) at 90 °C for 12 h, followed by enzymatic hydrolysis of the soluble and insoluble fractions. The release efficiencies of FA were up to 84.64% for DSWB and 66.73% for DSCB. Combined dilute PA pretreatment with enzymatic hydrolysis is a low-cost and highly efficient method for the extraction of FA from cereal brans.

Keywords

Feruloyl esterase Eupenicillium parvum Pretreatment with phosphoric acid Cereal brans Ferulic acid 

Abbreviations

FAE

feruloyl esterase (ferulic acid esterase)

MFA

methyl ferulate

FA

ferulic acid

SDS-PAGE

sodium dodecyl sulfate-polyacrylamide gel electrophoresis

DSWB

de-starched wheat bran

DSCB

de-starched corn bran

PA

phosphoric acid

HPLC

high-performance liquid chromatography

MW

molecular weight

Notes

Acknowledgments

The authors thank Dr. Franz St. John from the USDA Forest Service for improving the manuscript.

Funding

This work was supported by grants from a 948 Research Project (No. 2013-4-16) from the State Forestry Administration of China, a research project (30370043) from the National Natural Science Foundation of China, the Jiangsu Provincial Government Scholarship for Overseas Studies from Jiangsu Provincial Department of Education, China, a Science and Technology Project of Guizhou Province in China (Grant No. [2019]2333), and the Priority Academic Program Development of Jiangsu Higher Education Institutions.

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no conflict of interest.

Supplementary material

12010_2019_3189_MOESM1_ESM.docx (1 mb)
ESM 1 (DOCX 1037 kb)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.College of Chemical EngineeringNanjing Forestry UniversityNanjingChina
  2. 2.Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest ResourcesNanjing Forestry UniversityNanjingChina
  3. 3.Jiangsu Key Lab for the Chemistry & Utilization of Agricultural and Forest BiomassNanjingChina
  4. 4.Nanjing Institute for the Comprehensive Utilization of Wild PlantsNanjingChina

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