US 12,258,478 B2
Gardenia blue pigment and method for producing the same
Junya Yamashita, Osaka (JP); Masahiro Nishikawa, Osaka (JP); Kaori Miura, Osaka (JP); and Kenichi Fujimori, Osaka (JP)
Assigned to GLICO NUTRITION CO., LTD., Osaka (JP)
Appl. No. 17/603,621
Filed by GLICO NUTRITION CO., LTD., Osaka (JP)
PCT Filed Apr. 6, 2020, PCT No. PCT/JP2020/015494
§ 371(c)(1), (2) Date Oct. 14, 2021,
PCT Pub. No. WO2020/213448, PCT Pub. Date Oct. 22, 2020.
Claims priority of application No. 2019-078126 (JP), filed on Apr. 16, 2019.
Prior Publication US 2022/0195197 A1, Jun. 23, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C09B 61/00 (2006.01); A23L 5/43 (2016.01); C09B 67/00 (2006.01)
CPC C09B 61/00 (2013.01) [A23L 5/43 (2016.08); C09B 67/0001 (2013.01)] 3 Claims
 
1. A gardenia blue pigment, wherein, when the gardenia blue pigment is subjected to operations as set forth in (1) to (3) below, a color difference ΔE′ab between solution A heat-treated at 90° C. for 15 minutes and solution B not heat-treated is 3.5 or less, and solution A heat treated at 90° C. for 15 minutes has an L* value of 64 or more, an a* value of −14 or less, and a b* value of −31 or more:
wherein the operations comprise:
(1) a preparation step, wherein
the gardenia blue pigment is diluted with 0.1 M citrate buffer at pH 2.5 to prepare solution A with a color value E10%1 cm of 0.1; separately, the gardenia blue pigment is diluted with 0.1 M citrate buffer at pH 6.0 to prepare solution B with a color value E10%1 cm of 0.1;
(2) a heat-treatment of the solutions step, wherein
solution A is heat-treated at 90° C. for 15 minutes; solution B is not heat-treated;
(3) a measurement of color tone step, wherein
for solution A heat treated at 90° C. for 15 minutes and solution B not heat-treated, the L* value, the a* value, and the b* value in the Lab color space are measured.