分析物意义：小肠不能消化的碳水化合物
Megazyme检测试剂盒优点：试剂稳定。成本低。AOAC方法985.29和991.43；AACC方法32-07和32-21
The Total Dietary Fiber test kit is suitable is suitable for the measurement and analysis of Total Dietary Fiber.
For the determination of Total Dietary Fiber in cereal products,
foodstuffs, feeds and other materials
Principle:
(α-amylase + amyloglucosidase)
(1) Starch + H2O → D-glucose
(protease)
(2) Protein + H2O → peptides
(3) Dietary fiber determined gravimetrically following alcohol
precipitation
(4) Ash and residual protein determined on DF residues
and subtracted
Kit size: 100 / 200 assays
Method: Hydrolysis / removal of non-dietary
fibre components
Total assay time: ~ 100 min
Detection limit: 0.5-100% of sample weight
Application examples:
Food ingredients, food products and other materials
Method recognition:
AOAC (Methods 985.29, 991.42, 991.43 and 993.19), AACC
(Methods 32-05.01, 32-06.01, 32-07.01 and 32-21.01) and
CODEX (Type I Method)
Total Dietary Fiber Assay Kit, for the measurement and analysis of total, soluble and insoluble dietary fiber according to AOAC and AACC approved methods. See General Referee Reports: Journal of AOAC INTERNATIONAL, Vol. 81, No. 1, 1998.
Fiber is a mixture of complex organic substances, including hydrophilic compounds, such as soluble and insoluble polysaccharides and non-digestable oligosaccharides, as well as a range of non-swellable, more or less hydrophobic, compounds such as cutins, suberins and lignins. The procedures for the determination and analysis of total dietary fiber as outlined in our booklet are based on the methods of Lee et al.1 and Prosky et al.2,3 (AOAC 991.43, AOAC 985.29, AACC 32-07.01 and AACC 32-05.01). However, the enzymes in the Megazyme Total Dietary Fiber Kit can also be used in other dietary fiber analytical methods such as AACC Method 32-21.01 and AACC Method 32-06.01.
1. Association of Official Analytical Chemists. (1985). Official Methods of Analysis, 14th ed., 1st suppl. Secs. 43, A14-43, A20, p.399.
2. Association of Official Analytical Chemists. (1986). Changes in methods. J. Assoc. Off. Anal. Chem., 69, 370.
3. Association of Official Analytical Chemists. (1987). Changes in methods. J. Assoc. Off. Anal. Chem., 70, 393.
Two separate methods are described in the associated data booklet:
METHOD 1:
DETERMINATION OF TOTAL, SOLUBLE AND INSOLUBLE DIETARY FIBER
Based on AOAC Method 991.43 “Total, Soluble, and Insoluble Dietary Fiber in Foods” (First Action 1991) and AACC Method 32-07.01 “Determination of Soluble, Insoluble, and Total Dietary Fiber in Foods and Food Products” (Final Approval 10-16-91).
METHOD 2:
DETERMINATION OF TOTAL DIETARY FIBER
Based on AACC method 32-05.01 and AOAC Method 985.29.
Advantages
Q1. Should the pH of the sample be adjusted even for samples in acidic media?
The pH of the assay solution after the sample is added should be the same as that of the assay buffer that is supplied with the kit.
Low sample volumes (e.g. 0.1 mL) are not likely to affect the pH of the assay solution and therefore may not require pH adjustment.
Samples above 0.1 mL are more likely to affect the pH of the assay solution and therefore the pH of these samples should be adjusted as described in the data booklet, prior to addition to the assay.
The enzymes are very stable. In fact on storage at room temperature for 10 months, the decrease in activity of thermostable alpha-amylase and amyloglucosidase is less than 10% and the decrease in activity in protease is about 40%. When stored at 4˚C, the enzymes are stable for about 5 years, and at -20˚C they are stable for more than 10 years.
Our kit is applicable to the measurement of Soluble, Insoluble and Total Dietary Fibre as per the AOAC/AACC methods. The main value of our kit is that the Amyloglucosidase is free of Cellulase, i.e. the Beta-Glucan will not be degraded and underestimated.
The main reason for the stated 100˚C is to ensure that the starch is gelatinised and hydrolysed by alpha-amylase. We are sure that a temperature of 95˚C should be fine.
It is necessary to measure the nitrogen in the residue. Most protein is removed by protease action. We think it best to follow the AOAC method as closely as possible.
If you suspect that the Megazyme test kit is not performing as expected such that expected results are not obtained please do the following:
The crucible has the potential to break if heated or cooled too rapidly . The graph below shows the manufacturer's recommended heating and cooling profile for safe use with the crucible.
A volume reduction occurs on mixing water with 95% ethanol (or IMS). 1 L of 78% ethanol is prepared by adding 821 mL 95% ethanol (or IMS) to 207 mL H2O.
If using a 1 L volumetric flask, this is best accomplished by placing 821 mL 95% ethanol (or IMS) into the volumetric flask. Dilute to volume with deionised water. Mix well. Check the level and if necessary add more deionised water to bring it back up to the 1 L mark.
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