Native starch. Determination of starch content. Ewers polarimetric method

1998 ◽  
Keyword(s):  
Starch Content ◽  
Native Starch

Determination of starch content in single kernel using near-infrared hyperspectral images from two sides of corn seeds

2020 ◽  
Vol 110 ◽  
pp. 103462
Author(s):  
Chen Liu ◽  
Wenqian Huang ◽  
Guiyan Yang ◽  
Qingyan Wang ◽  
Jiangbo Li ◽  
...  
Keyword(s):  
Near Infrared ◽  
Starch Content ◽  
Hyperspectral Images ◽  
Two Sides

Determination of starch content in adulterated fresh cheese using hyperspectral imaging

2018 ◽  
Vol 21 ◽  
pp. 14-19 ◽  
Author(s):  
Abel Barreto ◽  
J.P. Cruz-Tirado ◽  
Raúl Siche ◽  
Roberto Quevedo
Keyword(s):  
Hyperspectral Imaging ◽  
Starch Content ◽  
Fresh Cheese

scholarly journals Use of Sieving as a Valuable Technology to Produce Enriched Buckwheat Flours: A Preliminary Study

Antioxidants ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 583 ◽  
Author(s):  
Beatriz Martín-García ◽  
Federica Pasini ◽  
Vito Verardo ◽  
Ana María Gómez-Caravaca ◽  
Emanuele Marconi ◽  
...  
Keyword(s):  
Particle Size ◽  
Phenolic Compounds ◽  
Phenolic Content ◽  
Starch Content ◽  
Salt Content ◽  
Total Phenolic ◽  
Physical Separation ◽  
Preliminary Study ◽  
Total Starch

Fractionation processes based on physical separation are a good strategy to produce enriched cereal flours. Therefore, the aim of this work is to evaluate the suitability of sieving of buckwheat flours to produce protein and phenolic (especially rutin) enriched fractions. Because of that, dehulled whole buckwheat flour (GSTQ) was sieved obtaining fractions with a particle size of 215 µm, 160 µm, 85 µm, and 45 µm (GS215, GS160, GS85, and GS45). For that purpose, the determination of protein, ash, and total starch content and free and bound phenolic compounds was carried out. The highest content of total phenolic compounds was obtained in GS215 (3118.84 mg kg−1 d.w.), followed by GS160 (2499.11 mg kg−1 d.w.), GS85 (989.46 mg kg−1 d.w.), GSTQ (983.15 mg kg−1 d.w.), and GS45 (481.31 mg kg−1 d.w.). Therefore, the phenolic content decreased with the particle size decrease from 215 µm to 45 µm. Besides, there were no significant differences between the total phenolic content in GS85 and GSTQ. The fraction with 215 µm reported the highest protein and mineral salt content and presented rutin amounts four times higher than GSTQ.

POLARIMETRIC DETERMINATION OF STARCH IN CEREAL PRODUCTS: I. RAPID DETERMINATION OF STARCH IN CRUDE GLUTEN

1942 ◽  
Vol 20c (8) ◽  
pp. 403-410 ◽  
Author(s):  
K. A. Clendenning
Keyword(s):  
Present Method ◽  
Chloride Solution ◽  
Rapid Determination ◽  
Starch Content ◽  
Calcium Chloride Solution ◽  
Stannic Chloride ◽  
Constant Ratio ◽  
Cereal Products ◽  
Rapid Procedure

Neither the original Mannich–Lenz procedure nor its recently proposed revisions proved suitable for the polarimetric determination of starch in gluten. The principal defect lay in the means of removing or correcting for proteins dissolved along with the starch and there also was a need for improvements in technique of starch dispersion.In the present method, the starch of the gluten sample is dispersed by 15 min. boiling in a calcium chloride solution having a specific gravity of 1.30 and a pH of approximately 2.5. Frothing is controlled by the addition of one or two drops of n-octyl alcohol, constant volume being maintained during boiling by the addition of water. The proteins dissolved by this treatment are precipitated with 20% stannic chloride prior to filtration and polarization. This rapid procedure underestimates the starch content but the application of a factor to correct for the constant ratio of underestimation allows the real starch content to be determined with an accuracy of ±0.5%.

scholarly journals Ilościowe oznaczanie skrobi w reakcji z jodem [Quantitative determination of starch in the reaction with iodine]

2015 ◽  
Vol 32 (1) ◽  
pp. 39-52
Author(s):  
Henryk Marciniak
Keyword(s):  
Statistical Analysis ◽  
Quantitative Determination ◽  
Quantitative Method ◽  
Starch Content ◽  
Thick Layer ◽  
Photometric Measurement ◽  
Positive Correlation ◽  
Method Of Determination

A quantitative method of determination by photometric measurement in the iodine-starch complex is described. Determinations were made within 0-250 μg range of starch content in 1 ml of solution. Starch was treated with 0.01N J in 1% KJ and extinction was read at wavelength 610 nm in a 1 cm thick layer of solution, with a "Specol" photocolorimeter. Statistical analysis of measurements showed a positive correlation between the starch amount and extinction.

Colorimetric Method for the Determination of Starch in Tobacco

1972 ◽  
Vol 55 (1) ◽  
pp. 209-213
Author(s):  
A J Sensabaugh ◽  
Kenneth L Rush
Keyword(s):  
Acid Treatment ◽  
Quantitative Measurement ◽  
Starch Content ◽  
Colorimetric Method ◽  
Colored Complex ◽  
Iodine Complex ◽  
Mesh Screen ◽  
Colorimetric Data ◽  
Tobacco Sample

Abstract A method is presented for extracting and determining the starch content of tobacco. Dried tobacco is ground to pass a 60 mesh screen, interfering colored materials are removed from the tobacco by a methanol-water extraction, and the starch is extracted from the tobacco by a perchloric acid treatment. Final quantitative measurement of the starch is made on a colored starch–iodine complex. The absorbance of this colored complex at 600 nm is proportional to the concentration of the starch in solution and can be related to the starch content of the original tobacco sample. Also included is a procedure for the isolation of pure tobacco starch. Such material was prepared for use as a calibration standard needed for the calculation of starch content of tobacco samples from the colorimetric data.

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