Volume 45, Issue 11 e15949
ORIGINAL ARTICLE

Low-viscosity dietary fiber production by enzymatic hydrolysis of galactomannan from Caesalpinia pulcherrima seeds: Optimization and physicochemical characterization

Antonia Ariana Camelo Passos

Corresponding Author

Antonia Ariana Camelo Passos

Science and Technology Center, Ceará State University—UECE, Fortaleza, Brazil

Correspondence

Antonia Ariana Camelo Passos, Science and Technology Center, Ceará State University—UECE. Av. Dr. Silas Munguba, 1700, Itaperi, Fortaleza, CEP 60714-903, Ceará, Brazil.

Email: [email protected]

Contribution: Conceptualization, Data curation, Formal analysis, ​Investigation, Methodology, Project administration

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Mighay Lovera

Mighay Lovera

Instituto de Biología Experimental, Facultad de Ciencias, Universidad Central de Venezuela, Caracas, Venezuela

Contribution: Data curation, Formal analysis, Methodology, Supervision, Visualization, Writing - review & editing

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Maria do Socorro Rocha Bastos

Maria do Socorro Rocha Bastos

Embrapa Tropical Agroindustry, Fortaleza, Brazil

Contribution: Conceptualization, Formal analysis, Supervision, Writing - review & editing

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Jeanny da Silva Maciel

Jeanny da Silva Maciel

Department of Organic and Inorganic Chemistry, Federal University of Ceará, Fortaleza, Brazil

Contribution: Conceptualization, Formal analysis, Methodology, Writing - review & editing

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Venícios Gonçalves Sombra

Venícios Gonçalves Sombra

Department of Organic and Inorganic Chemistry, Federal University of Ceará, Fortaleza, Brazil

Contribution: Formal analysis, ​Investigation, Methodology

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Renata Chastinet Braga

Renata Chastinet Braga

Federal Institute of Education, Science and Technology of Ceará, Limoeiro do Norte, Brazil

Contribution: Conceptualization, Visualization, Writing - review & editing

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Ana Cristina de Oliveira Monteiro Moreira

Ana Cristina de Oliveira Monteiro Moreira

Central of Experimental Biology—NUBEX, University of Fortaleza, Fortaleza, Brazil

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Renato de Azevedo Moreira

Renato de Azevedo Moreira

Central of Experimental Biology—NUBEX, University of Fortaleza, Fortaleza, Brazil

Contribution: Conceptualization, Formal analysis, Funding acquisition, ​Investigation, Validation, Visualization, Writing - review & editing

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First published: 16 September 2021
Citations: 5

Abstract

This study optimizes the enzymatic hydrolysis of galactomannan from Caesalpinia pulcherrima seeds to produce a low-viscosity dietary fiber. The effects of cellulase concentration (4.17–9.83 U/g of galactomannan) and hydrolysis time (98–392 min) on two response variables were evaluated using RSM. Some physical and chemical characteristics were determined on the hydrolysate selected in comparison with galactomannan. Both factors negatively affected the intrinsic viscosity, although positively influenced (p < .05) the reducing sugar content. The optimum condition was 9 U/g with 300 min, with 1.28 dl/g of intrinsic viscosity and 1.33% of reducing sugar. The hydrolysis increased total dietary fiber (1.9%) and soluble dietary fiber (2.8%) contents and decreased Mn from 26.4 × 104 to 3.2 × 104 g/mol. Thermal and scanning electron microscope analysis suggested internal and external molecular changes, respectively. However, FT-IR, 1H, and 13C-NMR spectra showed characteristic chemical bonds and a mannose/galactose ratio of 2:1. This hydrolyzed galactomannan is suitable as a low-viscose dietary fiber with potential applications in food industry.

Novelty Impact Statement

  • Galactomannan from seeds of Caesalpinia pulcherrima was successfully hydrolyzed.
  • Enzymatic hydrolysis caused a decrease of 87.72% in molecular mass.
  • The hydrolyzed product remained high in dietary fiber (84.3%).

CONFLICT OF INTEREST

The authors have declared no conflicts of interest for this article.

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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