Manufacturing method of modified starch with stable viscosity expression and high resistant starch content

• Main Authors: PARK KYOUNG OK, KIM SE WOOK, SEO TAE RANG, KIM HAK JUN
• Format: Patent
• Language: English; Korean
• Published: 07.06.2023
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; DERIVATIVES THEREOF; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; POLYSACCHARIDES; THEIR PREPARATION OR CHEMICAL WORKING-UP

The present invention provides a preparation method of modified starch, which comprises the steps of: adding an organic acid to starch slurry to achieve a concentration of 0.05 to 0.5 M, performing a reaction at 15 to 55 ℃ for 0.5 to 24 hrs, and adding a basic solution to adjust pH of the starch slurry to 5 to 7, thereby obtaining neutralized starch slurry; filtering, washing, and drying the neutralized starch slurry to obtain organic acid-treated starch with moisture content of 5 to 15% (w/w); and putting the organic acid-treated starch into a sealed container and performing moist heat treatment at 100 to 150 ℃ for 2 to 20 hrs to obtain final modified starch. The modified starch prepared according to the present invention has resistant starch content of at least 35% and a viscosity that is stably developed during gelatinization, so that the modified starch can be used in various fields such as an excipient, a thickener, and the like that require a certain level of viscosity. 본 발명은 전분 슬러리에 유기산을 0.05M 내지 0.5M의 농도가 되게 첨가하고 15~55℃에서 0.5~24 hr 동안 반응을 진행시킨 후, 염기성 용액을 첨가하고 전분 슬러리의 pH를 5~7로 조정하여 중화된 전분 슬러리를 수득하는는 단계; 상기 중화된 전분 슬러리를 여과, 수세 및 건조하여 수분 함량이 5~15%(w/w)인 유기산 처리 전분을 수득하는 단계; 및 상기 유기산 처리 전분을 밀폐된 용기에 넣고 100~150℃에서 2~20 hr 동안 습열처리하여 최종 변성전분을 수득하는 단계를 포함하는 변성전분방법을 제공한다. 본 발명의 방법으로 제조된 변성전분은 저항전분 함량이 적어도 35% 이상이면서, 호화시 점도가 안정적으로 발현되기 때문에 부형제, 증점제 등 일정 수준의 점도가 요구되는 다양한 분야에서 사용될 수 있다.