Preparation of Chitosan Oligosaccharide by Pre-ultrasound-microwave Assisted Composite Enzymatic Method and Its Antioxidant

JIA Feihong; JIANG Ning; YANG Huijing; LIU Qianyuan; SUN Rongxue; WANG Cheng; JI Qianqian; MA Yanhong; WANG Yu

doi:10.13386/j.issn1002-0306.2023090318

Volume 45 Issue 17

Aug. 2024

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Science and Technology of Food Industry > 2024 > 45(17): 190-199. > DOI: 10.13386/j.issn1002-0306.2023090318

JIA Feihong, JIANG Ning, YANG Huijing, et al. Preparation of Chitosan Oligosaccharide by Pre-ultrasound-microwave Assisted Composite Enzymatic Method and Its Antioxidant[J]. Science and Technology of Food Industry, 2024, 45(17): 190−199. (in Chinese with English abstract). doi: 10.13386/j.issn1002-0306.2023090318.

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Preparation of Chitosan Oligosaccharide by Pre-ultrasound-microwave Assisted Composite Enzymatic Method and Its Antioxidant

1.
College of Food Science and Engineering, Shanxi Agricultural University, Jinzhong 030800, China
2.
Institute of Agro-products Processing, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
3.
Huaian Bio-Health Industry Innovation Research and Development Center, Huaian 223001, China

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Received Date: October 08, 2023
Available Online: June 30, 2024

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Abstract

Abstract

To achieve efficient chitosan oligosaccharide preparation, chitosan oligosaccharide was prepared from chitosan through a pre-ultrasound-microwave assisted composite enzymatic method. The enzymatic hydrolysis process conditions were optimized using reducing sugar content as an indicator based on the response surface design method. In addition, the antioxidant capacity of chitosan oligosaccharide was examined. The results showed that the composite enzymes consisting α-amylase and chitosanase (1:1) possessed superior hydrolysis ability for chitosan than others. The optimum conditions of chitosan oligosaccharide preparation were as follows: A microwave power of 200 W, ultrasonic power of 200 W, 5 min pre-ultrasound-microwave time, 1% substrate concentration, pH5.8, temperature at 53.5 ℃, 0.24% composite enzyme additive amount, and 5.7 h enzymatic hydrolysis time. Under these conditions, the reducing sugar content reached the maximum (8.10 mg/mL). The prepared chitosan oligosaccharide contained 2~6 sugars with average molecular weight of 993.5 Da. The chitosan oligosaccharide had strong free radical scavenging activity, with the IC₅₀ of DPPH and ABTS⁺ free radicals at 0.274 and 0.127 mg/mL, respectively, as well as the ferric reducing power reached the maximum value of 24.56 mmol/L at 1.5 mg/mL. The results show that the ultrasound-microwave pretreatment combined with composite enzymatic method has a good application prospect in the preparation of chitosan oligosaccharide.
- chitosan,
- pre-ultrasound-microwave,
- enzymatic method,
- chitosan oligosaccharide,
- antioxidant activity

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