Fiber screen bag and method for rapidly determining coarse fiber

A rapid measurement and screen bag technology, applied in the direction of weighing by removing certain components, can solve the problems of slow operation process, low efficiency, long time, etc., achieve high precision and accuracy, and accurate analysis results , Analyze the effect of cost reduction

Inactive Publication Date: 2012-07-04
SHANDONG AGRICULTURAL UNIVERSITY
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the determination of crude fiber content in China is widely used in feed, grain, oil, food and other fields. So far, the country has promulgated national standards for the determination of crude fiber content in feed (filtration method GB / T6434-2006 / ISO6865:2000); Standard Grain and Oil Inspection of Crude Fiber Content in Grain Media Filtration Method (GB / T5515-2008 / ISO6865:2000); National Standard Determination of Crude Fiber in Plant Foods (GB / T5009.10-2003); National Standard Dietary Fiber in Food Determination of Determination of Neutral Detergent Fiber (NDF) in National Standard Feed (GB / T5009.88-2008); Determination of Neutral Detergent Fiber (NDF) Content in National Standard Feed (GB / T20806-2006) Mainly use the filtration method, after 2 times of filtration or suction filtration, the operation process is slow, the time is long, time-consuming and laborious, the determination of crude fiber takes 8-10 hours for each sample; if the firepower is controlled during the boiling process of acid, alkali, detergent, etc. Improper, it is easy to overflow or stick to the beaker wall, resulting in residue loss or incomplete treatment; low efficiency, only one sample is made for each beaker, and one person can only do one when filtering or rinsing, which is not suitable for the analysis of large batches of samples ; The cost is high, and a large number of instruments and reagents are needed, such as expensive fiber analyzers, filter pans and suction filtration devices, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Reagents, instruments and equipment:

[0029] (1) Sulfuric acid solution: c(H 2 SO 4 )=0.13mol / L. Each 1000ml contains 12.5g (about 7.10ml) of sulfuric acid.

[0030] (2) Potassium hydroxide solution: c(KOH)=0.23mol / L. Each 1000ml contains 12.5g of potassium hydroxide.

[0031] (3) Acetone.

[0032] (4) Special fiber screen bag (the screen aperture is 25um).

[0033] (5) Crushing equipment: it can crush the sample so that it can completely pass through a sieve with a sieve hole of 1mm.

[0034] (6) Analytical balance: Sensitivity 0.1mg.

[0035] (7) Beaker: capacity 2000ml or with a suitable cooling device, such as a condenser or a pan.

[0036] (8) Drying box: It is heated by electricity, can be ventilated, and can maintain temperature.

[0037] (9) Desiccator: filled with blue silica gel desiccant, inside a porous plate with a thickness of 2mm, preferably made of aluminum or stainless ste...

Embodiment 2

[0058] Choose 8 empty fiber screen bags to process according to the method and steps of the present invention, and measure the weight loss of the screen bags after acid, alkali and acetone treatment of the empty bags and drying in a 105°C oven for 1h. The results are shown in Table 2 , the average weight loss is 0.0005g, basically zero, which meets the experimental requirements. Another 4 empty fiber screen bags were selected and burned at 500°C for 30 minutes to measure the ash weight. The results are shown in Table 3. The average ash weight of each bag was -0.0004g, basically zero, which met the experimental requirements.

[0059]

[0060] Table 2 The drying quality change results of fiber mesh bags treated with acid, alkali and acetone

[0061] empty bag number Empty screen bag weight (g) Drying bag weight (g) weight loss(g) 1 0.2252 0.2249 0.0003 2 0.2376 0.2375 0.0001 3 0.2302 0.2296 0.0006 4 0.2168 0.2166 0.0002 5 0.226...

Embodiment 3

[0065] Select 6 samples of powder, wheat bran, feed, rabbit compound feed, soybean meal, and grass powder, and each sample is made into 5 parallel samples, and the crude fiber content is measured according to the method and steps of the present invention. The results of the measured samples are shown in Table 4, It can be seen that the results of parallel samples are relatively close, and the relative standard deviation (RSD) is basically within 5%. The precision calculation results are shown in Table 5, and the precision is relatively high.

[0066] Table 4 Results of sample precision determination by fiber mesh bags Unit: %

[0067] Parallel number Second powder Wheat bran feed soybean meal rabbit feed grass powder 1 5.54 10.64 11.66 4.17 12.23 32.94 2 5.61 10.81 11.70 4.36 12.24 33.06 3 5.67 11.12 12.07 4.79 12.82 34.78 4 5.86 11.14 12.17 4.92 13.33 34.90 5 5.99 11.16 12.51 5.05 13.43 36.53 RSD (...

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PUM

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Abstract

The invention relates to a fiber screen bag and a method for rapidly determining coarse fibers. After special fibers are used for making a screen with pore diameter being 25.0mum, a sample is put into a screen bag with certain size and is respectively boiled in acid and alkaline for 40min, then the sample is washed clean, dried and weighed and the content of the coarse fibers can be calculated by subtracting the weight of ash. The fiber screen bag and the method can be used by scientific research institutions, analysis and detection institutions, feed plants and the like to rapidly determine the content of the coarse fibers of feed, grains, oil and food on a large scale, and can also be used for rapidly determining neutral detergent fibers (NDF), acid detergent fibers (ADF), celluloses, hemicelluloses, dietary insoluble fibers, lignin and the like on a large scale. Compared with the traditional national standard method, the method has the advantages that the method is suitable for large-scale rapid determination, the efficiency is high, the time is short, the precision and the accuracy are high, the cost is low, and equipment such as any fiber determination instrument, filter and suction filtration devices and the like are not required. The fiber screen bag has the advantages that the bag is not floated, the weight is not lost, the moisture is not absorbed, the bag is not broken, the ash does not exist and the like when solvents such as acid, alkaline, acetone and the like are used for treatment.

Description

[0001] Technical field: [0002] The invention relates to a fiber screen bag and a method for rapidly measuring crude fiber, belonging to [0003] The field of new materials and the field of agricultural food. Background technique: [0004] At present, the determination of crude fiber content in China is widely used in feed, grain, oil, food and other fields. So far, the country has promulgated national standards for the determination of crude fiber content in feed (filtration method GB / T6434-2006 / ISO6865:2000); Standard Grain and Oil Inspection of Crude Fiber Content in Grain Media Filtration Method (GB / T5515-2008 / ISO6865:2000); National Standard Determination of Crude Fiber in Plant Foods (GB / T5009.10-2003); National Standard Dietary Fiber in Food Determination of Determination of Neutral Detergent Fiber (NDF) in National Standard Feed (GB / T5009.88-2008); Determination of Neutral Detergent Fiber (NDF) Content in National Standard Feed (GB / T20806-2006) Mainly use the filt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/04
Inventor 张崇玉曲绪仙杨在宾杨维仁张桂国尹朋辉
Owner SHANDONG AGRICULTURAL UNIVERSITY
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