Acid-detergent fiber

Detergent Methods. The neutral detergent fiber (NDF) and acid detergent fiber (ADF) methods (2), later modified for human foods (13), measure total insoluble plant cell wall material (NDF) and the cellulose—lignin complex (ADF). The easily solubilized pectins and some associated polysaccharides, galactomaimans of legume seeds, various plant gums, and seaweed polysaccharides are extracted away from the NDF. They caimot be recovered easily from the extract, and therefore the soluble fiber fraction is lost. 

Acid Detergent Fiber. The ground sample is heated for 1 h under reflux in a solution of 2% cetyltrimethyl ammonium bromide [57-09-0] in IN sulfuric acid [7664-93-9]. The acid hydrolyzes and dissolves the nonceUulosic polysaccharides. The insoluble residue, relatively free of hemiceUuloses and containing aU the ceUulose and lignin, is filtered, dried, and corrected for ash to give the ADF value. 

Municipal Sewage Treatment Plant. The reactors were batch-fed daily an RDF (refuse derived fuel) processed MSW feedstock obtained from Future Fuels Inc. in Thief River Falls, MN. The processed MSW feed contained 52% of dry weight (DW) cellulose, 20% lignin-plastics, 2% ash, and 26% acid-detergent solubles (% DW as determined by the acid-detergent-fiber assay (63)). The MSW feedstock was added to a nutrient solution at 5% w/v for daily feeding as previously described (55). 

Group D was fed basal ration to the level fed to Groups A, B, and C (17.5% C.P.). Acid-detergent fiber (ADF) and acid-detergent lignin (ADL) were determined according to the method of Van Soest (61). Statistical analyses were done by the analysis of variance. 

Figure 1. The effect of gamma irradiation of hemlock sawdust on certain of its chemical constituents and on its susceptibility to rumen microbial action in vitro. ADF = acid-detergent fiber ADL = acid-detergent lignin CD = cellulose digestion DMD = dry matter disappearance...

Table 1 In vitro dry matter digestibility (IVDMD), neutral detergent fiber (NDF), acid detergent fiber (ADF), acid detergent lignin (ADL), and ethanol production of leaf and stem tissues of 12-week-old bermudagrass (Cynodon sp.), mature napiergrass (Pennisetum purpureum) and giant reed (Arundo donax) grown at Tifton, GA. 2004.

Fiber complexes of ten tobacco cultlvars as byproducts of the leaf protein extraction process contain levels of neutral and acid detergent fiber comparable to that of alfalfa fiber and in excess of that in wheat bran. Compositional analyses revealed lesser concentrations of cellulose, lignin, and lipid but a greater amount of hemlcellulose in tobacco than in alfalfa. In reference to wheat bran, tobacco fiber has comparable amounts of Na, P, S,... 

In the feed and forage industries NIR methods have been used extensively. NIR factory-based quality control schemes have been implemented which enhance the economy with which feed components are used, and the quality and consistency of the final product. Moisture, crude protein, and acid detergent fiber analyses of feeds are being steered through the AO AC (Association of Official Analytical Chemists) validation process. NIR is also used widely in the US tobacco industry for measuring nicotine and other process parameters both on- and offline. 

Comparison of Mineral Predictions from a Forage Dataset Using (1) the NIR Spectra with a Four-Term — log(1 JR) equation and (2) Crude Protein and Acid Detergent Fiber Only, to Predict Mineral Content (Mixed Species Flay)... 

Garrido A, Sanchez MX, Cano G, Perez D, Lopez C (2001) Prediction of neutral and acid detergent fiber content of green asparagus stored under refrigeration and modified atmosphere conditions by near-infrared reflectance spectroscopy. J Food Quality 24 539-550... 

EE ether extract, CP crude protein ADE Acid Detergent Fiber. 

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