Optimization of saccharification prospective from starch of sweet potato roots through acid-enzyme hydrolysis : structural, chemical and elemental profiling

Jagatee Suman and Priyadarshini Sonali and Pradhan Chinmay and Sahoo Santi L. and Mohanty Rama C. and Ram Shidharth S. and Sudarshan Mathummal and Teka Tilahun A. and Rout Jyoti R.: Optimization of saccharification prospective from starch of sweet potato roots through acid-enzyme hydrolysis : structural, chemical and elemental profiling. In: Acta biologica Szegediensis, (64) 2. pp. 139-150. (2020)

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Abstract

The sweet potato root, a potent source of starch which is being considered as an effi cient alternative for fuel ethanol production in recent times. The starchy substrate needs to be subsequently dextrinized and saccharifi ed so as to enhance the utilization of its carbohydrates for ethanol production. In the present investigation, acid-enzyme process was conducted for the dextrinization and saccharifi cation of sweet potato root fl our (SPRF). The best optimized condition for dextrinization was achieved with an incubation period of 60 min, temperature 100 ºC and 1M HCl. However, for saccharifi cation, the best result was obtained with an incubation of 18 h, pH 4, temperature 65 ºC and 1000 U concentration of Palkodex®. After the dextrinization process, maximum concentrations of total sugar and hydroxymethylfurfural (HMF) [380.44 ± 3.17 g/kg and 13.28 ± 0.25 mg/g, respectively] were released. Nevertheless, after saccharifi cation, 658.80 ± 7.83 g/kg of total sugar was obtained which was about 73% more than that of dextrinization. After successful dextrinization and saccharifi cation, the structural, chemical and elemental analysis were investigated using techniques such as scanning electron microscopy (SEM), Fourier-transforms infrared spectroscopy (FTIR) and energy-dispersive X-ray fl uorescence spectrophotometer (EDXRF), respectively. Eff ective hydrolysis was demonstrated in thin layer chromatography (TLC) where the HCl was able to generate monomeric sugar such as glucose and maltose. On the other hand, only glucose is synthesized on the mutual eff ect of HCl and Palkodex®. The SEM fi ndings indicate that the rough structure of both dextrinized and saccharifi ed sample was gained due to the vigorous eff ect of both acid and enzyme subsequently. The saccharifi ed SPRF when subjected to fermentation with Saccharomyces cerevisiae and Zymomonas mobilis separately, it was observed that Z. mobilis produced more stretching vibration of –OH than S. cerevisiae, which evidenced the better production of bioethanol. Additionally, evaluation of the infl uence of S. cerevisiae and Z. mobilis through elemental analysis revealed upsurge in the concentrations of S, Cl, Ca, Mn, Fe and Zn and decline in the concentrations of P, K and Cu in the fermented residue of S. cerevisiae and Z. mobilis, however, Z. mobilis showed little more variation than that of S. cerevisiae.

Item Type: Article
Journal or Publication Title: Acta biologica Szegediensis
Date: 2020
Volume: 64
Number: 2
ISSN: 1588-4082
Page Range: pp. 139-150
Language: English
Related URLs: http://acta.bibl.u-szeged.hu/73049/
DOI: 10.14232/abs.2020.2.139-150
Uncontrolled Keywords: Mikrobiológia, Növénybiológia
Additional Information: Bibliogr.: p. 97-98. ; összefoglalás angol nyelven
Subjects: 01. Natural sciences
01. Natural sciences > 01.06. Biological sciences
01. Natural sciences > 01.06. Biological sciences > 01.06.10. Plant sciences, botany
01. Natural sciences > 01.06. Biological sciences > 01.06.10. Plant sciences, botany > 01.06.10.11. Plant biology
01. Natural sciences > 01.06. Biological sciences > 01.06.01. Cell biology, microbiology
01. Natural sciences > 01.06. Biological sciences > 01.06.01. Cell biology, microbiology > 01.06.01.01. Microbiology
Date Deposited: 2021. Jul. 15. 14:31
Last Modified: 2021. Jul. 15. 14:31
URI: http://acta.bibl.u-szeged.hu/id/eprint/73064

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