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. 2021 Feb 20;10(2):463.
doi: 10.3390/foods10020463.

Evaluation of Xylooligosaccharides Production for a Specific Degree of Polymerization by Liquid Hot Water Treatment of Tropical Hardwood

Soo-Kyeong Jang  1 , Jong-Hwa Kim  2 , June-Ho Choi  2 , Seong-Min Cho  2 , Jong-Chan Kim  2 , Hoyong Kim  3 , In-Gyu Choi  2   4
Affiliations

Evaluation of Xylooligosaccharides Production for a Specific Degree of Polymerization by Liquid Hot Water Treatment of Tropical Hardwood

Soo-Kyeong Jang et al. Foods. .

Abstract

Eucalyptus pellita is known as attractive biomass, and it has been utilized for eucalyptus oil, furniture, and pulp and paper production that causes a significant amount of byproducts. Liquid hot water treatment depending on combined severity factor (CSF) was subjected to isolate hemicellulose fraction from E. pellita and to produce xylooligosaccharides (XOS). The xylan extraction ratio based on the initial xylan content of the feedstock was maximized up to 77.6% at 170 °C for 50 min condition (CSF: 1.0), which had accounted for XOS purity of 76.5% based on the total sugar content of the liquid hydrolysate. In this condition, the sum of xylobiose, xylotriose, and xylotetraose which has a low degree of polymerization (DP) of 2 to 4 was determined as 80.6% of the total XOS. The highest XOS production score established using parameters including the xylan extraction ratio, XOS purity, and low DP XOS ratio was 5.7 at CSF 1.0 condition. XOS production score evaluated using the CSF is expected to be used as a productivity indicator of XOS in the industry (R-squared value: 0.92).

Keywords: Eucalyptus pellita; XOS production score; combined severity factor; liquid hot water treatment; xylooligosaccharides (XOS).

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Monomeric sugar content (g/100 g initial biomass) of liquid hydrolysate after LHW treatment from E. pellita.
Figure 2
Figure 2
Sugar derivatives content (g/100 g initial biomass) of liquid hydrolysate after LHW treatment from E. pellita.
Figure 3
Figure 3
Xylose and XOS content (g/100 g initial biomass) of liquid hydrolysate after LHW treatment from E. pellita.
Figure 4
Figure 4
Conversion ratio (%) of xylose and XOS as a DP variation depending on changes of CSF value of LHW treatment conditions.
Figure 5
Figure 5
The relationship between XOS production score and CSF values.
Figure 6
Figure 6
Enzymatic digestibility (%, based on a dry weight of substrate) and glucose yield (%, based on the glucose content in the initial biomass) from E. pellita and solid fractions after LHW treatment with hemicellulose and lignin removal ratio (%, based on the content in the initial biomass).
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