RETRACTED: Rice straw derived graphene-silica based nanocomposite and its application in improved co-fermentative microbial enzyme production and functional stability

M. Asiri; N. Srivastava; R. Singh; A. Al Ali; S.C. Tripathi; A. Alqahtani; M. Saeed; M. Srivastava; A.K. Rai; V.K. Gupta

doi:10.1016/j.scitotenv.2023.162765

RETRACTED: Rice straw derived graphene-silica based nanocomposite and its application in improved co-fermentative microbial enzyme production and functional stability

M. Asiri
, N. Srivastava
, R. Singh
, A. Al Ali
, S.C. Tripathi
, A. Alqahtani
, M. Saeed
, M. Srivastava
, A.K. Rai
, V.K. Gupta

Biorefining And Advanced Materials Research Centre

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

Cellulases are the one of the most highly demanded industrial biocatalysts due to their versatile applications, such as in the biorefinery industry. However, relatively poor efficiency and high production costs are included as the key industrial constraints that hinder enzyme production and utilization at economic scale. Furthermore, the production and functional efficiency of the β-glucosidase (BGL) enzyme is usually found to be relatively low among the cellulase cocktail produced. Thus, the current study focuses on fungi-mediated improvement of BGL enzyme in the presence of a rice straw-derived graphene-silica-based nanocomposite (GSNCs), which has been characterized using various techniques to analyze its physicochemical properties. Under optimized conditions of solid-state fermentation (SSF), co-fermentation using co-cultured cellulolytic enzyme has been done, and maximum enzyme production of 42 IU/gds FP, 142 IU/gds BGL, and 103 IU/gds EG have been achieved at a 5 mg concentration of GSNCs. Moreover, at a 2.5 mg concentration of nanocatalyst, the BGL enzyme showed its thermal stability at 60°C and 70 °C by holding its half-life relative activity for 7 h, while the same enzyme demonstrated pH stability at pH 8.0 and 9.0 for the 10 h. This thermoalkali BGL enzyme might be useful for the long-term bioconversion of cellulosic biomass into sugar.

Original language	English
Article number	162765
Number of pages	11
Journal	Science of the Total Environment
Volume	876
Early online date	9 Mar 2023
DOIs	https://doi.org/10.1016/j.scitotenv.2023.162765
Publication status	Print publication - 10 Jun 2023

Bibliographical note

Copyright © 2023. Published by Elsevier B.V.
This article has been retracted: please see Elsevier policy on Article Correction, Retraction and Removal (https://www.elsevier.com/about/policies-and-standards/article-withdrawal).
This article is being retracted at the request of an impartial field expert acting in the role of an independent Publishing Ethics advisor.
Post-publication, an investigation was conducted on behalf of the journal by Elsevier's Research Integrity & Publishing Ethics team with guidance from the Independent Publishing Ethics Advisor. This investigation discovered suspicious changes in authorship between the original submission and the revised version of this paper. During revision, the authors Subhash C. Tripathi and Ashutosh Kumar Rai were added to the revised paper without explanation and without exceptional approval by the journal editor, which is contrary to the journal policy on changes to authorship.
Additionally, the investigation found that the review of this submission was handled by the Guest Editor Prakash Kumar Sarangi despite an ongoing collaboration on a co-publication with one of the paper authors Vijai Kumar Gupta at the time this manuscript was submitted. This compromised the editorial process and breached the journal's policies.
Elsevier's Research Integrity & Publishing Ethics team reached out to the authors for an explanation, but they failed to provide a satisfactory explanation to address these concerns.
Having reviewed the findings of Elsevier's Research Integrity & Publishing Ethics team, the Independent Publishing Ethics Advisor has lost confidence in the integrity of the article and has determined it should be retracted.
The authors disagree with retraction and dispute the grounds for it.

Keywords

BGL
Biofuels production
Cellulases
Fermentable sugar
Nanocatlyst
Rice straw

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https://www.scopus.com/inward/record.uri?eid=2-s2.0-85150241633&doi=10.1016%2fj.scitotenv.2023.162765&partnerID=40&md5=b8c2e9a4ae9fa6e433848d5dc7858784

Cite this

Asiri, M., Srivastava, N., Singh, R., Al Ali, A., Tripathi, S. C., Alqahtani, A., Saeed, M., Srivastava, M., Rai, A. K., & Gupta, V. K. (2023). RETRACTED: Rice straw derived graphene-silica based nanocomposite and its application in improved co-fermentative microbial enzyme production and functional stability. Science of the Total Environment, 876, Article 162765. https://doi.org/10.1016/j.scitotenv.2023.162765

@article{4817f03e21584dbfa67a108a97bf41ff,

title = "RETRACTED: Rice straw derived graphene-silica based nanocomposite and its application in improved co-fermentative microbial enzyme production and functional stability",

abstract = "Cellulases are the one of the most highly demanded industrial biocatalysts due to their versatile applications, such as in the biorefinery industry. However, relatively poor efficiency and high production costs are included as the key industrial constraints that hinder enzyme production and utilization at economic scale. Furthermore, the production and functional efficiency of the β-glucosidase (BGL) enzyme is usually found to be relatively low among the cellulase cocktail produced. Thus, the current study focuses on fungi-mediated improvement of BGL enzyme in the presence of a rice straw-derived graphene-silica-based nanocomposite (GSNCs), which has been characterized using various techniques to analyze its physicochemical properties. Under optimized conditions of solid-state fermentation (SSF), co-fermentation using co-cultured cellulolytic enzyme has been done, and maximum enzyme production of 42 IU/gds FP, 142 IU/gds BGL, and 103 IU/gds EG have been achieved at a 5 mg concentration of GSNCs. Moreover, at a 2.5 mg concentration of nanocatalyst, the BGL enzyme showed its thermal stability at 60°C and 70 °C by holding its half-life relative activity for 7 h, while the same enzyme demonstrated pH stability at pH 8.0 and 9.0 for the 10 h. This thermoalkali BGL enzyme might be useful for the long-term bioconversion of cellulosic biomass into sugar.",

keywords = "BGL, Biofuels production, Cellulases, Fermentable sugar, Nanocatlyst, Rice straw",

author = "M. Asiri and N. Srivastava and R. Singh and \{Al Ali\}, A. and S.C. Tripathi and A. Alqahtani and M. Saeed and M. Srivastava and A.K. Rai and V.K. Gupta",

note = "Copyright {\textcopyright} 2023. Published by Elsevier B.V. This article has been retracted: please see Elsevier policy on Article Correction, Retraction and Removal (https://www.elsevier.com/about/policies-and-standards/article-withdrawal). This article is being retracted at the request of an impartial field expert acting in the role of an independent Publishing Ethics advisor. Post-publication, an investigation was conducted on behalf of the journal by Elsevier's Research Integrity \& Publishing Ethics team with guidance from the Independent Publishing Ethics Advisor. This investigation discovered suspicious changes in authorship between the original submission and the revised version of this paper. During revision, the authors Subhash C. Tripathi and Ashutosh Kumar Rai were added to the revised paper without explanation and without exceptional approval by the journal editor, which is contrary to the journal policy on changes to authorship. Additionally, the investigation found that the review of this submission was handled by the Guest Editor Prakash Kumar Sarangi despite an ongoing collaboration on a co-publication with one of the paper authors Vijai Kumar Gupta at the time this manuscript was submitted. This compromised the editorial process and breached the journal's policies. Elsevier's Research Integrity \& Publishing Ethics team reached out to the authors for an explanation, but they failed to provide a satisfactory explanation to address these concerns. Having reviewed the findings of Elsevier's Research Integrity \& Publishing Ethics team, the Independent Publishing Ethics Advisor has lost confidence in the integrity of the article and has determined it should be retracted. The authors disagree with retraction and dispute the grounds for it. ",

year = "2023",

month = jun,

day = "10",

doi = "10.1016/j.scitotenv.2023.162765",

language = "English",

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journal = "Science of the Total Environment",

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Asiri, M, Srivastava, N, Singh, R, Al Ali, A, Tripathi, SC, Alqahtani, A, Saeed, M, Srivastava, M, Rai, AK & Gupta, VK 2023, 'RETRACTED: Rice straw derived graphene-silica based nanocomposite and its application in improved co-fermentative microbial enzyme production and functional stability', Science of the Total Environment, vol. 876, 162765. https://doi.org/10.1016/j.scitotenv.2023.162765

TY - JOUR

T1 - RETRACTED: Rice straw derived graphene-silica based nanocomposite and its application in improved co-fermentative microbial enzyme production and functional stability

AU - Asiri, M.

AU - Srivastava, N.

AU - Singh, R.

AU - Al Ali, A.

AU - Tripathi, S.C.

AU - Alqahtani, A.

AU - Saeed, M.

AU - Srivastava, M.

AU - Rai, A.K.

AU - Gupta, V.K.

N1 - Copyright © 2023. Published by Elsevier B.V. This article has been retracted: please see Elsevier policy on Article Correction, Retraction and Removal (https://www.elsevier.com/about/policies-and-standards/article-withdrawal). This article is being retracted at the request of an impartial field expert acting in the role of an independent Publishing Ethics advisor. Post-publication, an investigation was conducted on behalf of the journal by Elsevier's Research Integrity & Publishing Ethics team with guidance from the Independent Publishing Ethics Advisor. This investigation discovered suspicious changes in authorship between the original submission and the revised version of this paper. During revision, the authors Subhash C. Tripathi and Ashutosh Kumar Rai were added to the revised paper without explanation and without exceptional approval by the journal editor, which is contrary to the journal policy on changes to authorship. Additionally, the investigation found that the review of this submission was handled by the Guest Editor Prakash Kumar Sarangi despite an ongoing collaboration on a co-publication with one of the paper authors Vijai Kumar Gupta at the time this manuscript was submitted. This compromised the editorial process and breached the journal's policies. Elsevier's Research Integrity & Publishing Ethics team reached out to the authors for an explanation, but they failed to provide a satisfactory explanation to address these concerns. Having reviewed the findings of Elsevier's Research Integrity & Publishing Ethics team, the Independent Publishing Ethics Advisor has lost confidence in the integrity of the article and has determined it should be retracted. The authors disagree with retraction and dispute the grounds for it.

PY - 2023/6/10

Y1 - 2023/6/10

N2 - Cellulases are the one of the most highly demanded industrial biocatalysts due to their versatile applications, such as in the biorefinery industry. However, relatively poor efficiency and high production costs are included as the key industrial constraints that hinder enzyme production and utilization at economic scale. Furthermore, the production and functional efficiency of the β-glucosidase (BGL) enzyme is usually found to be relatively low among the cellulase cocktail produced. Thus, the current study focuses on fungi-mediated improvement of BGL enzyme in the presence of a rice straw-derived graphene-silica-based nanocomposite (GSNCs), which has been characterized using various techniques to analyze its physicochemical properties. Under optimized conditions of solid-state fermentation (SSF), co-fermentation using co-cultured cellulolytic enzyme has been done, and maximum enzyme production of 42 IU/gds FP, 142 IU/gds BGL, and 103 IU/gds EG have been achieved at a 5 mg concentration of GSNCs. Moreover, at a 2.5 mg concentration of nanocatalyst, the BGL enzyme showed its thermal stability at 60°C and 70 °C by holding its half-life relative activity for 7 h, while the same enzyme demonstrated pH stability at pH 8.0 and 9.0 for the 10 h. This thermoalkali BGL enzyme might be useful for the long-term bioconversion of cellulosic biomass into sugar.

AB - Cellulases are the one of the most highly demanded industrial biocatalysts due to their versatile applications, such as in the biorefinery industry. However, relatively poor efficiency and high production costs are included as the key industrial constraints that hinder enzyme production and utilization at economic scale. Furthermore, the production and functional efficiency of the β-glucosidase (BGL) enzyme is usually found to be relatively low among the cellulase cocktail produced. Thus, the current study focuses on fungi-mediated improvement of BGL enzyme in the presence of a rice straw-derived graphene-silica-based nanocomposite (GSNCs), which has been characterized using various techniques to analyze its physicochemical properties. Under optimized conditions of solid-state fermentation (SSF), co-fermentation using co-cultured cellulolytic enzyme has been done, and maximum enzyme production of 42 IU/gds FP, 142 IU/gds BGL, and 103 IU/gds EG have been achieved at a 5 mg concentration of GSNCs. Moreover, at a 2.5 mg concentration of nanocatalyst, the BGL enzyme showed its thermal stability at 60°C and 70 °C by holding its half-life relative activity for 7 h, while the same enzyme demonstrated pH stability at pH 8.0 and 9.0 for the 10 h. This thermoalkali BGL enzyme might be useful for the long-term bioconversion of cellulosic biomass into sugar.

KW - BGL

KW - Biofuels production

KW - Cellulases

KW - Fermentable sugar

KW - Nanocatlyst

KW - Rice straw

UR - https://www.scopus.com/pages/publications/85150241633

UR - https://doi.org/10.1016/j.scitotenv.2026.182204

U2 - 10.1016/j.scitotenv.2023.162765

DO - 10.1016/j.scitotenv.2023.162765

M3 - Article

C2 - 36906037

SN - 0048-9697

VL - 876

JO - Science of the Total Environment

JF - Science of the Total Environment

M1 - 162765

ER -

RETRACTED: Rice straw derived graphene-silica based nanocomposite and its application in improved co-fermentative microbial enzyme production and functional stability

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Keywords

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