Method for preparing hydroxyalkyl starch
A technology of hydroxyalkyl starch and starch, applied in the field of preparation of hydroxyalkyl starch, can solve the problems of easy degradation, reduce the stability of gelatinized solution, etc., and achieve improved whiteness, improved color and physical properties, and thermal stability. excellent effect
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Embodiment 1
[0049] In order to measure the viscosity change of hydroxypropyl starch according to acid treatment, hydroxypropyl starch was prepared from starch in which the viscosity was controlled by acid treatment, and then the viscosity change of each sample was measured.
[0050] 3,000 g of waxy corn starch (Samyang Genex Corporation, 12 wt% water content) was treated with hydrochloric acid (35%, Duksan Pure Chemicals Co., Ltd.) several times and in various treatment amounts, and other processes were performed under the same conditions . The reaction temperature of the acid treatment was maintained at 40°C, and the pH of the aqueous starch was adjusted to 9 after each sample was reacted with the acid for a certain period of time. After being treated with 66 g of 20% sodium borohydride (98%, Samchun Chemical) solution for 15 hours, the resultant was neutralized to pH 6.2, washed, dehydrated and dried. 50 g of catalyst (which was prepared by mixing 50% (w / v) sodium hydroxide and propyle...
Embodiment 2
[0055] In order to determine the bleaching effect on acid-treated starch according to the sodium metabisulfite treatment, the whiteness of the starches prepared with varying sodium metabisulfite treatment amount and treatment time was measured.
[0056] The starch was dissolved in water and maintained at 43°C. Then, based on the dry weight of 100 parts by weight of starch, 0.4 parts by weight of hydrochloric acid (35%, Duksan Pure Chemicals Co., Ltd.) was used for 4 hours, and based on the dry weight of 100 parts by weight of starch, 1 part by weight of sodium metabisulfite ( 98%, Samchun Chemical) process the starch. Measure the whiteness of samples collected hourly. The results are listed in Table 2.
[0057] [Table 2]
[0058]
[0059] The starch was dissolved in water and maintained at 43°C. Then, based on the dry weight of 100 parts by weight of starch, use 0.4 parts by weight of hydrochloric acid (35%, Duksan Pure Chemicals Co., Ltd.) for 4 hours, and based on the...
Embodiment 3
[0064] After treatment with sodium metabisulfite, the aldehyde groups at the starch end groups were reduced by treatment with sodium borohydride. Starch stability was tested indirectly by measuring the whiteness at hourly sodium borohydride treatment time.
[0065] All samples were treated with 0.6 parts by weight of hydrochloric acid for 3 hours, based on 100 parts by weight of dry weight starch, and with 1 part by weight of sodium metabisulfite for 4 hours, based on 100 parts by weight of dry weight of starch. Then, samples 15-19 were treated with 0.5 parts by weight of sodium borohydride for 3, 6, 9, 12 and 15 hours, respectively, based on 100 parts by weight of dry weight of starch, and the whiteness of the samples was measured. The results are listed in Table 4.
[0066] [Table 4]
[0067]
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