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Valorization of rice straw and vascular aquatic weeds for sustainable prebiotic hemicellulosic autohydrolysate production: Extraction, characterization and fermentability

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Abstract

This study describes the extraction and characterization of the hemicellulosic autohydrolysates (HAHs) derived from rice straw (RS) and vascular aquatic weeds like Typha angustifolia (TA) and Ceretophyllum demersum (CD). It further explores their capacity to sustain the proliferation of selected lactic acid bacteria (i.e., prebiotic activity) isolated from milk samples. To fractionate HAH from RS, TA and CD hot water extraction (HWE) method was used and RS, TA, and CD biomasses yielded 6.8, 4.99 and 2.98% of HAH corresponding to the hemicellulose extraction efficiencies of 26.15 ± 0.8%, 23.76 ± 0.6%, and 18.62 ± 0.4% respectively. The chemical characterization of HAH concentrates through HPLC showed that they comprised galactose, arabinose, xylose and glucose. The total phenol content of the RS, TA and CD-derived HAH concentrates were 37.53, 56.78 and 48.08 mg GAE/g. The five lactic acid bacteria (LAB) isolates Q1B, Q2A, Q3B, G1C and G2B selected for prebiotic activity assays generated mixed responses with the highest growth in RS-HAH for Q2A and the least in TA-HAH for Q3B. Further, the isolates Q2A, Q3B, G1C, and G2B, which showed the highest growth performance, were identified through MALDI-TOF and 16S rRNA sequencing as Lactobacillus brevis. All the tested LAB isolates showed diauxic growth in crude HAH preparations to maximize the utilization of carbon resources for their proliferation. This suggests that the selected LAB isolates are efficient degraders of hemicellulosic sugars. This paves the way for the valorization of lignocellulosic biomass to produce prebiotic hemicellulosic autohydrolysate and consequently enhances environmental sustainability by improving resource efficiency.

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Acknowledgements

The authors are thankful to the Centre of Research for Development (CORD), University of Kashmir, Srinagar, Jammu and Kashmir for providing the necessary facilities to carry out the research work. We acknowledge and appreciate Dr. Harsh Panwar from GADVASU, Ludhiana for helping us make the MALDI-TOF facility available and the Department of Food Science and Technology, University of Kashmir for facilitating the freeze-drying of the samples.

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The authors declare that the work was carried out of the sanctioned budget of the department and no other external funds or grants were received during the preparation of this manuscript.

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The author Rouf Ahmad Dar contributed to the study conceptualization and design. Methodology, formal analysis and data collection were performed by Mawish Mahroof. The first draft of the manuscript was written by Mawish Mahroof and Rouf Ahmad Dar, and all the authors commented on previous versions of the manuscript. The resources were provided by Rouf Ahmad Dar, Ruqeya Nazir and Md. Niamat Ali. The work was supervised by Rouf Ahmad Dar and Ruqeya Nazir. All authors worked on the manuscript revision and finalization. All authors read and approved the final manuscript.

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Correspondence to Rouf Ahmad Dar.

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Mahroof, M., Dar, R.A., Nazir, R. et al. Valorization of rice straw and vascular aquatic weeds for sustainable prebiotic hemicellulosic autohydrolysate production: Extraction, characterization and fermentability. Environ Sci Pollut Res 31, 35744–35759 (2024). https://doi.org/10.1007/s11356-024-33611-4

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  • DOI: https://doi.org/10.1007/s11356-024-33611-4

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