Novel biodegradable flocculating agents prepared by phosphate modification of Konjac

Xie, Chenxin; Feng, Yujun; Cao, Wei-Ping; Xia, Yu; Lu, Zhiyong

doi:10.1016/j.carbpol.2006.06.036

Cited by 46 publications

(23 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This solution was diluted with water to 0.1% for most tests (<10 ppm). Flocculation performance was assessed using essentially the method of Xie, Feng, Cao, Xia, and Lu (2007). Kaolin (1 g) and nanopure water (100 g) were mixed at high speed in a 150 ml beaker using a 2.5 cm long magnetic stir bar for 5 min.…”

Section: Flocculation Of Kaolinmentioning

confidence: 99%

Flocculation of kaolin by waxy maize starch phosphates

Shogren

2009

Carbohydrate Polymers

View full text Add to dashboard Cite

Section: Flocculation Of Kaolinmentioning

confidence: 99%

Flocculation of kaolin by waxy maize starch phosphates

Shogren

2009

Carbohydrate Polymers

View full text Add to dashboard Cite

“…Synthesis of the PPM The synthesis of the phosphorylated polysaccharide was according to the method of Xie et al (2006). A typical procedure is as follows: appropriate amount of NaH 2 PO 4 ·2H 2 O and Na 2 HPO 4 ·12H 2 O with 2 g urea were put into a beaker and were dissolved in 60 mL distilled water.…”

Section: Methodsmentioning

confidence: 99%

“…The product was then concentrated and lyophilized to give acetylated polysaccharide (yield, 67.2 %). The benzoylated polysaccharide was prepared according to a similar procedure, except that Ac 2 O was replaced with phthalic acid anhydride (yield, 54.6 %).Synthesis of the PPM The synthesis of the phosphorylated polysaccharide was according to the method of Xie et al (2006). A typical procedure is as follows: appropriate amount of NaH 2 PO 4 ·2H 2 O and Na 2 HPO 4 ·12H 2 O with 2 g urea were put into a beaker and were dissolved in 60 mL distilled water.…”

mentioning

confidence: 99%

Antioxidant Activity of the Derivatives of Polysaccharide Extracted from a Chinese Medical Herb (Ramulus mori)

Zhang

Jin

Shi

2008

FSTR

View full text Add to dashboard Cite

The antioxidant activity of the polysaccharide from Ramulus mori and its derivatives (sulfated, phosphorylated, acetylated and benzoylated polysaccharides) were determined, including scavenging activity against superoxide, hydroxyl and 1,1-diphenyl-2-picrylhydrazyl radicals, reducing power and chelating ability. Obvious differences in antioxidant activity between the natural polysaccharide and its derivatives were observed, the antioxidant activity of the sulfated, phosphorylated and acetylated derivatives was stronger than that of the natural polysaccharide. In addition, the effect of temperature (20, 40, 60, 80 and 90 °C) and pH (3, 5, 7, 9 and 11) on the antioxidant activity of the natural polysaccharide and its derivatives was also investigated. The antioxidant activity of all samples in the linoleate emulsion improved with increasing from pH 3 to 11, while it decreased with ascending storage temperature from 20 to 90 °C.Keywords: antioxidant activity, temperature, pH, polysaccharide derivatives, Ramulus mori *To whom correspondence should be addressed. Email: slgsilk@zju.edu.cn IntroductionReactive oxygen species (ROS) produced by sunlight, ultraviolet light, ionizing radiation, chemical reactions and metabolic processes have a wide variety of pathological effects, such as causing DNA damage, carcinogenesis and cellular degeneration related to aging (Blander et al., 2003). In order to reduce damage of free radicals, synthetic antioxidants such as butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT), propylgallate (PG), and tert-butylhydroquinone (TBHQ) are used. However, BHA and BHT have been suspected of being responsible for liver damage and carcinogenesis (Grice, 1988). Thus, it is essential to develop and utilize effective and natural antioxidants so that they can protect the human body from free radicals and retard the progress of many chronic diseases (Nandita and Rajini, 2004).Polysaccharides are common structural and storage polymers in living organisms, representing more than 75 % of the dry mass of plants. Polysaccharides are potentially useful, biologically active ingredients for pharmaceutical uses due to a variety of biological activities, such as immunological, anti-radiation, anti-blood coagulation, anti-cancer, anti-HIV and hypoglycemic activities (Yang et al., 2005;Yoon et al., 2003;Lee et al., 2002). The activity of polysaccharides is close related to their structure such as molecular mass, degree of substitution, degree of branching, sugar component and the structures of main chain and branches (Bohn and BeMiller, 1995). Thus, chemical modifications of polysaccharides provided an opportunity to obtain new agents with possible therapeutic uses (Franz and Alban, 1995).Ramulus mori is the branch of Morus alba L., family Moraceae, according to the theories of traditional Chinese medicine, it is slightly bitter in taste, mild in nature, and attributive to the liver meridian. In traditional Chinese medicine, its pharmacological actions are to expel wind, dredge the meridians, and ease...

show abstract

“…For these reasons, alternative coagulants and flocculants are being sought for environmental applications. Biopolymers may be of great interest because they are naturally low-cost and environmentally friendly products [8][9][10][11][12][13][14][15][16]. Among these biopolymers, chitosan may be considered one of the most promising coagulation-flocculation materials.…”

Section: Introductionmentioning

confidence: 99%