just add 30 g of CMC to 1 L of DI water, continuously stir the solution for a couple of days (3- 5 or more)

Thank you for your reply Liu sir

we need to maintain any temperature for contineous stirring or room temperature condition only contineous strring is enough?

room temperature should be OK.

I have never tried heating the solution to expedite the dissolution process although I have heard somebody did it. you may give it a try

http://www.google.pl/url?url=http://www.brenntagspecialties.com/en/downloads/Products/Multi_Market_Principals/Aqualon/Aqualon_CMC_Booklet.pdf&rct=j&frm=1&q=&esrc=s&sa=U&ei=kjodVe_9IMneOOqwgIAD&ved=0CB4QFjAB&usg=AFQjCNEc1OZ7sTUJsdeTiFapDKZr_G7ODg

Try bath sonication to dissolve the CMC completely. Cellulose are not perfectly soluble in water. So you may need more time or increase temperature as suggested.

Add 50 ml water to 3 g carboxymethyl cellulose . Allow it to swll overnight. Add slightly more water say, 30 ml. Stirr and heat to 40-50 degree Celsious. Once it is completely dissolved add the remaining amount of water to make it 100 ml.

It is generally quite difficult to CMC in water at higher conc.However,the solution can be prepared adding very small quantities of CMC (about 100 mg), t say in100 ml of water and agitating vigorously with a mechanical stirrer till it is dissolved and repeat the procedure. .A temperature of about 40C may be maintained.The solution shold always be stirred before use and if possible keep it under stirring while using it.It is possible there may be a suspension formation.

Thank you very much for your reply 

I suggest to add a preservative to this mixture as well. 

I had used the solutions of CMC in my work many times.Hence,what I had mentioned is based on experience.Adding 30g of CMC to 1l of water will not give solution.Please remember it is SCMC.

@Ruiqiang Liu, Is it okay to dissolve the CMC in DW? I'm worrying about that what if gavage injection of DW induces diarrhea?

@So-Jin Kim . Hi, Dr. Kim: we used the CMC solution for engineering purposes. we have never tested it for biological/medicinal/pharmaceutical uses. thanks

I also would like to know the procedure to make 100% cellulose solution. can anyone suggest?