Abstract
Polysaccharides from Auricularia polytricha (APPS) were extracted using Ultrasonic/Microwave Assisted Extraction (UMAE) technology. UMAE conditions of APPS were optimized with Response Surface Methodology (RSM). Rheological properties of APPS were investigated. The results suggested that the optimal UMAE conditions for APPS were ratio of water to raw material 22 (mL/g), extraction time 15.3 min and microwave power 59W. APPS solution exhibited Newtonian flow behavior at low concentration, formed entanglement network at lower concentration and established weak gel structures with solid-like properties at higher concentration. The viscosity of APPS solutions decreased when temperature increased. The viscosity, storage (G') and loss (G") modulus of APPS solution increased when sucrose concentration increased. Heating time and freeze-thaw changes had no significant effect on rheological properties of APPS. The results suggested that UMAE was a suitable and efficient method for APPS extraction and APPS had potential as a novel food additive hydrocolloid in food industry.
Highlights
Mushrooms have been considered as edible and medicinal resources for thousands of years and many biologically active molecules have been isolated and identified from mushrooms (Wang et al, 2018)
To date, there have been no reports of Ultrasound/Microwave Assisted Extraction (UMAE) of polysaccharides from A. polytricha (APPS)
Ultrasonic/Microwave Assisted Extraction (UMAE) conditions of APPS were optimized with Response Surface Methodology (RSM) on basis of single factor experiment as follows: Ratio of water to raw material 22 mL/g, extraction time 15.3 min and microwave power 59W
Summary
Mushrooms have been considered as edible and medicinal resources for thousands of years and many biologically active molecules have been isolated and identified from mushrooms (Wang et al, 2018). Auricularia polytricha belonging to the Auriculariaceae family is widely distributed in many places in China, such as Hebei, Heilongjiang, Anhui, Jiangxi and Guangdong. It has high contents of carbohydrates in the fruiting bodies traditionally used as food and medicine in China (Fan et al, 2006) and has lowering blood-fat, antioxidant, antitumor, antinociceptive and immunomodulatory activities (Mau et al, 2001). To date, there have been no reports of Ultrasound/Microwave Assisted Extraction (UMAE) of polysaccharides from A. polytricha (APPS). Rheological properties of APPS were investigated to explore further the applications and the functional properties as a novel food additive hydrocolloid in food industry. Yield and purity of APPS were measured using the following equation: APPS yield weight of crude polysaccha ride extract (g) 100% (1)
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