Thanks for your reply. We have been using the same NREL method. although the problem is that the value of NDF is more than ADF. which should not happen, as the ADF is inclusive of Cellulose, Hemicellulose and Lignin.
Thanks for sharing the literature. Some of these literatures I have been using. The main problem is that the value of ADF is more than NDF which should not happen, as the NDF is inclusive of Cellulose, Hemicellulose and Lignin while ADF is only cellulose and hemicellulose.
Wise’s chlorite for holocellulose and Kurschner-Hoffer nitric acid method for cellulose and Tappi T 222 om-88, for lignin. I can explain these methods if you want
Standard Methods of AOAC (2000) are useful in determining the chemical composition of lignocellulosic biomass.
As NDF = Cellulose + Hemicellulose + Lignin
ADF = Cellulose + Lignin
So, NDF can never be less than ADF.
I believe you remember that biomass is hygroscopic in nature. The kind of problem you are facing may generally arise due to imprecise weighing practice. Please, make sure:
You are taking dried sample (constant/non-fluctuating weight) at every step/stage of biomass analysis.
You are weighing the sample under controlled conditions.
Instead of weighing the sample directly after taking out from the oven, shift the sample to a desiccator until it reaches at room temperature (constant/non-fluctuating weight) as the hot sample has higher tendency to absorb moisture from the environment.
Other than weighing issues, please confirm that:
You are providing appropriate time to digest the sample with NDF as well as ADF reagent.
Your crucibles are in good condition (if using AOAC method) that NDF/ADF reagent can be completely sucked out from it via suction.
i also need material related to analysis of cellulose, hemicellulose and lignin in biomass.If possible from your side please. send me on [email protected].
The cellulose was obtained by refluxing wood meal three times for 1 h with a 1:4 (v/v) mixture of nitric acid and ethanol. Three replicates were done for each experiment, and mean values were used (Browning, 1967; Tutus et al., 2014; Tutus et al., 2015),.
10 ml Nitric Acid, 40 Ml Ethanol (each replicate)
After 1 hour, remove nitric acid and ethanol mixture with 2 por gooch crucible. Then, again add nitric acid and ethanol. For softwood you should four replicates, for hardwood you should three replicates. And dont forget to use refluxing.
References:
Browning, B.L., 1967: Methods of Wood Chemistry, Vol. 2. Interscience/Wiley, New York.
Tutus, A., Kazaskeroglu, Y., Cicekler, M., 2015: Evaluation of Tea Wastes in Usage Pulp and Paper Production, Bioresources 10(3), 5407-5416.
Tutus, A., Cicekler, M., Ozdemir, A., Altas, A., 2014: Evaluation of Astragalus membranaceus in Pulp and Paper Production, 3rd International Non-wood Forest Products Symposium, 323-331, 8-10 May 2014, Kahramanmaras-Turkey.
i also need material related to analysis of cellulose, hemicellulose and lignin in biomass.If possible from your side please. send me on [email protected]
Thanks a lot :)
Can anyone suggest a simple method for determining cellulose, hemicellulose and lignin content of dried leaves? - ResearchGate. Available from: https://www.researchgate.net/post/Can_anyone_suggest_a_simple_method_for_determining_cellulose_hemicellulose_and_lignin_content_of_dried_leaves [accessed Sep 6, 2016].
the 4:1 ethanol:HNO3 method (Kürschner Hoffer) works very well for wood is very simple non toxic - it has beeen originally invented for wood as far as I know in 1929, it works well especially for hardwood; for softoowd digestion it is not so precise.... But with my experience there can be touble for other material (e.g. fossile wood). I have no experience with leaves though. If you need complex assessment of extractives, holocellulose, lignin, then there is a method by Rowell et al 2012, which is easy to follow and at the end you have all parameters. IF you need it I can send the method description to you.
FTIR may be used to quantify lignin and cellulose, for example:
Article Evaluation of morphological and chemical aspects of differen...
https://www.astm.org/Standards/E168.htm
Article ChemInform Abstract: Qualitative and Quantitative Analysis o...
Article Practical uses of FTIR spectroscopy in wood science and technology
Popescu et al. (2011), for example, wrote: "FT-IR spectroscopy can offer the possibility of a quantitative lignin determination in wood. The intensity of the band of aromatic skeletal vibrations around 1510 cm-1 is a measure for the lignin content. Faix [24] indicate that the following non-linear equation describes well the relation between the lignin content and the height of the 1510 cm-1 band x:
% Lignin = -1.23 + 193.4 x + 279:8 x2
The ASTM E168 method may be used to construct calibration curves with biomass constituents (xylan, cellulose, kraft lignin; commercially available from Sigma Aldrich and other suppliers). With the help of the linear equations derived from the calibration curve one can then quantify the amount of the constituent in the sample. Knowing the total amount of sample used for FTIR one can then determine the relative content.
In order to determine cellulose, you must first determine the neutral detergent fibre (NDF), acid detergent fibre (ADF), and acid detergent lignin (ADL) in your samples, then use the following equations:
Using the Van Soest et al , (1991) method is the rignt method. You should first determine the NDF, ADF and ADL content of your samples, then you have the cellulose, hemicellulose by a simple soustraction