Waxy corn starch

Waxy com starch, also known as waxy maize starch, consists of only amylopec-tin molecules, giving this starch different and useful properties (see Chapter 3). This genetic variety of com was discovered in China in the early 1900s, when com plants were transferred from the Americas. The starch stains red with iodine, not blue as ordinary starches do. When the com kernel is cut, the endosperm appears shiny and waxlike, and the com was termed waxy com or waxy maize. However, it contains no wax. 

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In a current rheological study [296], the galactoxyloglucan from Hymenia courbaril was mixed with starch containing 66% amylose and with waxy corn starch (amylopectin). The gel mixtures showed, under static rheological conditions, an increase in paste viscosity compared to those of the polysaccharides alone. Dynamic rheometry indicated that the interactions resulted in increased thermal stability of the gel formed in comparison to that of the starch alone. 

SW- waxy corn starch, SWNPs- starch nanopartides. Cel- microcrystaUine cellulose, CelNPs- cellulose nanopartides, CB- carbon black, SWAcNPs- waxy starch acetate nanopartides, CelAcNPs cellulose acetate nanopartides. 

Xie, X., Liu, Q., Cui, S. W. (2006). Studies on the granular structure of resistant starches (type 4) from normal, high amylose and waxy corn starch citrates. Food Research International, 39, 332-341. 

Reddy, L, Seib, P. A. (2000). Modified waxy wheat starch compared to modified waxy corn starch. J. Cereal Sci., 37,25-39. 

Many pyrazines were isolated and identified in cooked foods, especially in cooked meats (27). Pyrazines comprised over 40% of the volatile compounds found in cooked pork liver (28). Two pyrazines, 2-methyl-3(or 6)-pentylpyrazine and 2,5-dimethyl-3-pentylpyrazine were among 52 volatiles identified as lipid-protein-carbohydrate interaction products in a zein regular or waxy corn starch-corn oil model system (7). 

Control Preparations Transfer 50.0-g portions of unmodified (underivatized) waxy corn starch into five separate pressure bottles, and add 125 mL of 2 N sulfuric acid to each bottle. Add 0.0, 0.5, 1.0, 2.0, and 5.0 mL of the Standard Preparation to the bottles, respectively, giving propylene chlorohydrin concentrations, on the starch basis, of 0, 0.5, 1, 2, and 5 mg/kg, respectively. Calculate the exact concentration in each bottle from the weight of Propylene Chlorohydrins used in making the Standard Preparation. Clamp the tops in place, swirl until the contents of each bottle are completely dissolved, and proceed with the hydrolysis, neutralization, filtration, extraction, extract concentration, and final dilution as directed under Sample Preparation. 

Figure 8-38 Viscoamylograph Viscosity Curves of Substituted Waxy Corn Starch. A = cross-bonded waxy corn, B = nonionic substituted cross-bonded waxy corn, and C = anionic substituted cross-bonded waxy corn. Source Reprinted from L.H. Kruger and R. Murray, Starch Texture, in Rheology and Texture in Food Quality, J.M. deMan, P.W. Voisey, V.F. Raspar, and D.W. Stanley, eds., 1976, Aspen Publishers, Inc.

Acetylated(60FL)-Industrial grade-Waxy corn starch... 

Acetylated acid thinned waxy corn starch (28.35 gr. Scott = 40-50 sec.)... 

As a rule, the viscosity of potato starch triacetate solution appears to be higher than the viscosity of other starch acetates while the viscosity of waxy corn starch triacetate is lower than the viscosity of other starch acetates in keeping with the relative molecular weights of these starches. 

Kou, Y., Dickinson, L.C., and Chinachoti, P. Mobility characterization of waxy corn starch using wide-line H-1 nuclear magnetic resonance, /. Agric. Food Chem., 48, 5489, 2000. 

Mobility of freezable and unfreezable water in waxy corn starch 1998 (46)... 

Hnang, J.J. and White, P.J. 1993. Waxy corn starch monoglyceride interaction in a model system. Cereal Chem., 70(1), 42. 

G1 -CD was discovered in 1965 and proved at the end of 1966. However, the yield of Gl-CD was very low, i.e. 2% (amylopectin as substrate), and difficult to separate. Later on, based on the study of CGTase from Bacillus macerans, it was established that waxy corn starch could be used as the starting material to produce Gl-CD. This method was improved in 1984 when the Gl-CD crystalline was obtained and the structure and properties of Gl-CD were characterized. 

Chem. Descrip. Vise, modified waxy corn starch CAS 9005-25-8 EINECS/ELINCS 232-679-6 Uses Film-former providing wafer holding for papermaking size press, pigmented size press, and paper coatings Features Provides machine cleanliness and runnability CMCDaicel [DaicelUSA]... 

Figure 2.3 DSC thermograms of retrograded waxy corn starch with intermediate water content after initial heating to 120°C and immediate quenching and storage at 5 °Cfor 0, 1, 2, 3, 4, 5, 10, 18 h, 1, 3, 5, 10, 15 and 20 days, respectively (from bottom). (Reprinted with permission from reference 134], Copyright 2013, John Wiley Sons, Ltd.)...

A Naegeli-type amylodextrin of DP 21 and containing one branch-point in each molecule has been prepared from waxy corn starch. The adsorption of monobasic fatty acids from n-hexane on to dry amylose has been found to follow Langmuir s adsorption isotherm. Changes in the physical properties of a potato starch with a high content of phosphate in the presence of cations have been described. Alkali-metal cations produced an increase in the viscosity of solutions of this potato starch, whereas alkaline-earth-metal cations initiated a two-step swelling process and lowered the viscosity. 

Structural collapse during baking of high-ratio cake batter formulated with unchlorinated wheat flour or with reconstituted flour containing waxy corn starch in place of wheat starch (due to lack of development of leached-amylose network Tg) > Tg ... 

The relative content of amylose and amylopectin varies between species, and between different cultivars of the same species. For example, high-amylose pea starch comprises about 75% amylose whilst waxy corn starch contains more than 99% amylopectin. 

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