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In this study, highly oil-absorbing deacetylated konjac glucomannan octenyl succinate gel (DK-OS) was prepared using deacetylated konjac glucomannan gel (DK-G) as the raw material and octenyl succinic anhydride (OSA) as the esterifying agent. The Box-Behnken experimental design was employed to investigate the effects of four factors (reaction temperature, pH, DK-G concentration, and OSA and DK-G mass ratios [mOSA/mDK-G]) on the degree of substitution (DS) and oil absorption capacity (OAC) of DK-OS. To optimize the process conditions, DK-OS with high OAC and DS was prepared under optimal conditions. The DK-OS was further characterized via infrared spectroscopy, crystalline structure analysis, hydrophobicity assessment, and microscopic morphology. The influence of the four factors on the OAC of DK-OS followed the order of mOSA/mDK-G>pH>reaction temperature>DK-G concentration, whereas the order of influence on DS was mOSA/mDK-G>DK-G concentration>pH>reaction temperature. The optimal conditions for the esterification process were 39 °C, pH8.5, 2% DK-G concentration, mOSA/mDK-G=1.9, and 4 h reaction time. Under these conditions, the resulting DK-OS exhibited a DS of 0.0623±0.0002 and an OAC of 53.88±0.02 g/g. Infrared spectroscopy revealed that the peak intensity of DK-OS at 1727 cm−1 (associated with the ester group) was enhanced after esterification. Additionally, methylene stretching vibration peaks and carboxylate asymmetric stretching vibration peaks were observed at 2926, 2857, and 1566 cm−1, respectively. Notably, the pores that developed on the microstructural surface of DK-OS exhibited increased roughness, whereas the crystal form of the esterified product remained unchanged. The hydrophobic angle increased significantly from 61.5° to 105.3°, thereby reflecting a marked enhancement in surface hydrophobicity. This study provides a technical reference for the development of high-oil-absorption dietary fibers.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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