title: Separation, preliminary characterization, and moisture-preserving activity of polysaccharides from Ulva fasciata.
abstract: Sulfated polysaccharide (UFP(31)) extracted from the marine algae Ulva fasciata (UFP) was a heteropolysaccharide, and consisted of rhamnose, xylose, and glucose in a ratio of 1:0.46:0.27 with a (1 → 4)-linked glycosyl backbone. The rheology of UFP(31) solution has been investigated by steady shear and small amplitude oscillatory experiments. The effects of concentration, temperature, and time were systematically investigated. Steady-shear rheological measurement in a range of shear rate (1-1000 s(-1)) exhibited that UFP(31) has a Newtonian behavior in diluted solutions (1.0%, 3.0%, and 5.0%, w/v), dilatant flow behavior at higher concentrations (7.0% and 9.0%, w/v). Speciﬁcally, UFP(31) solution (7%, w/v) exhibited antithixotropic behavior. In small amplitude oscillatory experiments, both the storage modulus (G') and the loss modulus (G") of UFP(31) solution (7%, w/v) increased with frequency swept but G' increased more quickly. As a consequence, G' tends to overcome G" at 2.7 Hz. The capability of moisture-absorption and moisture-retention of the polysaccharide was also respectively examined gravimetrically in comparison with those of glycerol. It revealed that UFP(31) exhibited a higher ability both in the moisture-absorption and moisture-retention test throughout the entire experiment. These results clearly establish the possibility that UFP(31) could be employed as a new material of nature moisturizer.
authors.affiliation: Department of Food Science and Technology, Zhejiang University of Technology, Zhejiang, Hangzhou 310014, PR China. Electronic address: pingshao325@163.com.
authors.forename: Ping
authors.initials: P
authors.lastname: Shao
authors.affiliation: Department of Food Science and Technology, Zhejiang University of Technology, Zhejiang, Hangzhou 310014, PR China.
authors.forename: Jiamei
authors.initials: J
authors.lastname: Shao
authors.affiliation: Department of Food Science and Technology, Zhejiang University of Technology, Zhejiang, Hangzhou 310014, PR China.
authors.forename: Longfei
authors.initials: L
authors.lastname: Han
authors.affiliation: Department of Food Science and Technology, Zhejiang University of Technology, Zhejiang, Hangzhou 310014, PR China.
authors.forename: Ruiling
authors.initials: R
authors.lastname: Lv
authors.affiliation: Department of Food Science and Technology, Zhejiang University of Technology, Zhejiang, Hangzhou 310014, PR China.
authors.forename: Peilong
authors.initials: P
authors.lastname: Sun
mesh_terms: D005947:Glucose / Q000737:chemistry; D005990:Glycerol / Q000737:chemistry; D011134:Polysaccharides / Q000737:chemistry* / Q000302:isolation & purification; D012210:Rhamnose / Q000737:chemistry; D012212:Rheology; D013431:Sulfates / Q000737:chemistry; D044445:Ulva / Q000737:chemistry*; D014783:Viscosity; D014867:Water / Q000737:chemistry*; D014994:Xylose / Q000737:chemistry
chemical_list: D011134:Polysaccharides; D013431:Sulfates; D014867:Water; D014994:Xylose; D005947:Glucose; D005990:Glycerol; D012210:Rhamnose
keywords: Moisture-preserving activity; Rheology measurement; Ulva fasciata polysaccharides