+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Manufacture of and uses for low molecular weight agars and agaroids



Manufacture of and uses for low molecular weight agars and agaroids



Official Gazette of the United States Patent and Trademark Office Patents 1252(4)



A process is claimed whereby an aqueous solution of agar, in which most (ideally all) 4-linked residues consist of 3,6-anhydro-L-galactose, is subjected to partial acid hydolysis and upon neutralization following the time appropriate for the chosen conditions, a low strength gel is obtained, from which, contrary to expectations, a polyagarobiose can be obtained by freeze-thawing and straining, thereby eliminating undesirable agaroid materials without the appropriate 3,6-anhydrogalactosyl content. The appropriate time of hydrolysis depends on initial gel strength, pH, counterion concentration and temperature. As an example, agar (gel strength 700 g/cm2, made to 1.86% solution) pH 3.25, counterion citrate (360 mg/L) at 96degree C. requires 25 minutes to yield a material with an eventual gel stregth (1.5% solution) of 40 g/cm2. A stabilized product can be prepared by reducing terminal anhydrogalactosyl residues with sodium borohydride. The resultant products are useful for preparing gels for application to the skin, such as massage gels, as skin moisturizers, or as carriers of other active ingredients, such as pharmaceuticals able to be applied through the skin.

Please choose payment method:






(PDF emailed within 1 workday: $29.90)

Accession: 035260441

Download citation: RISBibTeXText


Related references

Determination of molecular weight of agars and effect of the molecular weight on the glass transition. Journal of Agricultural and Food Chemistry 47(2): 473-478, 1999

The system of low-molecular-weight carrageenans and agaroids from the room-temperature-extracted fraction of Kappaphycus alvarezii. Carbohydrate Research 325(4): 287-299, 2000

Manufacture and use of low-molecular-weight polybutenes. Chemistry and Technology of Fuels and Oils 26(4): 185-188, 1990

Quality assurance in clinical dextran manufacture by molecular weight characterization. Process Biochemistry 12(10): 15-22, 1977

Technology of manufacture of proserine tablets containing high molecular weight compounds and their study. Farmatsiya 36(6): 22-23, 1987

Manufacture of low-molecular-weight hydrocarbons by the hydrogenation of coals in a mixture with tire rubber. Solid Fuel Chemistry 44(3): 175-182, 2010

The manufacture of a high grade disolving pulp. The molecular weight distribution of various types of pulps. Agric And Biol Chem 25(12): a98, 1961

The control of cellulose biosynthesis by Acetobacter xylinum in view of molecular weight and molecular weight distribution: Part I: Change of molecular weight of bacterial cellulose by simple variation of culture conditions. Journal of Carbohydrate Chemistry 16(4-5): 635-646, 1997

Highly active, recyclable catalyst for the manufacture of viscous, low molecular weight, COethenepropene-based polyketone, base component for a new class of resins. Inorganica Chimica Acta 327(1): 147-159, 2002

The manufacture of a high grade dissolving pulp. 9. The relation between mechanical properties of rayon fibers and molecular weight distribution of the aged alkali celluloses. Agric And Biol Chem 26(1): a3-A4, 1962

Screening agars for MRSA: evaluation of a stepwise diagnostic approach with two different selective agars for the screening for methicillin-resistant Staphylococcus aureus (MRSA). Military Medical Research 2: 18, 2015

Mechanical properties of mammalian and fish gelatins based on their weight average molecular weight and molecular weight distribution. Food Hydrocolloids 23(8): 2315-2321, 2009

Enhanced value products from agaroids. Proceedings of the 17th International Seaweed Symposium, Cape Town, South Africa, 28 January 2 February 2001: 213-220, 2003

Estimation of the molecular weight of ions by isotachophoresis iv. comparison of the correlations of mobility with molecular volume and with molecular weight. Chemical and Pharmaceutical Bulletin 36(10): 3985-3993, 1988

Ultradrawing gel films of blends of ultrahigh molecular weight polyethylene and low molecular weight polyethylenes with different molecular weights. Journal of Materials Science 35(13): 3227-3236, 2000