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09 October 2014 1,699 2 View

What is the best way of reducing bioburden in a finished powdered product?

I have a problem of high bio burden (TAMC TYMC E choli etc) in some of my products. I have managed to reduce Yeast and Fungi with dry heating at 100 C but i am not able to reduce E .Choli . Please...

06 July 2014 629 4 View

Is there any compound named potassium biochromate?

I have an analysis which involves the use of Potassium Bichromate but I am not able to find it in any chemical list. Are Potassium Dichromate and Potassium Bichromate the same thing or different?

08 September 2013 9,205 2 View

How can we use the value of A(1%, 1cm) in the calculation in an analysis by spectrophotometer?

I have a assay where absorbance has to be measured and in which the A% value is given and I want to find out the % of the material present. The method is according to the pharmacopeia . please guide.

08 September 2013 3,360 7 View

Can anyone suggest a simple method of determination of chloride in berberine tannate?

Please suggest a simple method of determination of chloride in berberine tannate. The method given in JP (Japanese Pharmacopoeia) is very complicated and is very confusing. Please suggest any...

07 August 2013 2,943 2 View

Reaction and manufacturing technique of Polyurethane foam using Polyol and MDI

Can anyone guide me about the mixing ratio of Polyol and MDI for the formation of Polyurethane foam(PUF) and Polyurethane coating liquid?

04 May 2013 9,707 1 View

Please tell me the assay method for calculation of phosphate in sodium hexametaphosphate

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02 March 2013 3,041 2 View

Can any one guide me about designing of extraction plant by super Critical Carbondioxide

I have a project on designing of extraction plant by super critical carbon dioxide, what are the essential steps?

31 December 2012 7,665 2 View

Can anyone explain the use of Sodium Hexametaphosphate in Boilers?

What is the ratio in which Sodium Hexametaphosphate should be added in the boiler water to prevent scaling?

31 December 2012 854 3 View

Can anyone guide me with the simple assay methods for the different salts of berberine? Titration or a UV method is preferable.

Berberine

31 December 2012 9,041 0 View

How to increase a model accuracy ?

dear community, my model is based feature extraction from non stationary signals using discrete Wavelet Transform and then using statistical features then machine learning classifiers in order to...

03 March 2021 6,994 5 View

Waters 2707 HPLC autosampler problem?

I am using a 2707 waters HPLC device. When I try to inject a sample, it says missing plate or rack. I changed the needle and calibrated its position but I still get the same problem. I even get...

02 March 2021 1,408 1 View

How optimize the Size Exclusion Chromatography?

Hello! I'll do a size exclusion chromatography, but I only have an open column, and I'll perform the peptide extraction from yeast, using buffer lysis (sodium phosphate 50 mM/NaCl 30 mM/DNAse and...

01 March 2021 2,215 2 View

Precipitate after adding laemmli buffer to protein solution containing Potassium Acetate?

Hi, I am running a size exclusion chromatography experiment with a buffer containing Potassium Acetate as a salt. I analyse these fractions through SDS-PAGE. After boiling my SEC fractions in...

01 March 2021 2,622 3 View

Any research papers for extraction of nutrient deprivation on macroalgae? Analysed by HPLC-UV and GC/MS. Possibly from macroalgae genus Rhizoclonium?

I am doing my thesis on the nutrient deprivation on the macroalgae Rhizoclonium sp. I will be analysing the levels over a period of roughly 5 days by HPLC-UV and GC/MS. I will be using seawater as...

28 February 2021 6,477 1 View

Necessary tube lenght to cool Natural gas in a dry-ice cooling bath?

I have a tank which contains natural gas at 250 Bar and 293 Kelvin. I want to cool the gas in a dry-ice cooling bath to about 195 Kelvin. The gas will flow in a copper-tube through the bath with a...

27 February 2021 8,128 1 View

Exit velocity of natural gas from pressurized tank?

Hi Guys. I'm a mechanical engineer and have a bit trouble, would be very glad if you could help me with my questions. I have a pressurized tank which contains Natural Gas at 200 Bar and 293...

26 February 2021 6,253 3 View

Gas sensor response and recovery time independant of flow rate and chamber volume?

I am trying to obtain the response and recovery times for my gas sensor device. It appears the the response/recovery times are primarily dependant on the flow rate of the gas I inject into the...

26 February 2021 1,511 3 View

Why do a weight decrease for thermal degradation in nitrogen gas condition?

Hi all The question is related to TGA(Thermogravimetric analysis). Thermal degradation easily understood but why do samples weight decrease? altough just binding is broked, the weight of...

26 February 2021 1,100 5 View

Why do the air flow results vary totally when adding scalar in CFD ?

Dear All, We are using Autodesk cfd to calculate the air flow in a single sided naturally ventilated room, where air flow depends only on buoyancy due to temperature difference between inside and...

25 February 2021 9,602 4 View