• 한국식품영양학회지
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• 제23권1호
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• pp.23-29
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• 2010

Pigment concentrates with violet-red color and sweet taste were obtained from purple-fleshed sweet potato(PFSP) using ethyl alcohol and water. Extract from general potato(GP) were used as a control. The relative stability of PFSP pigment concentrate(PFSPPC) in a storage test over 15 days was confirmed in the order of dark > fluorescence > sun-light irradiation. The relative stability of GP pigment concentrate(GPPC) in a storage test over 15 days was confirmed in the order of sun-light > fluorescence > dark storage. The RRP of PFSPPC was higher than that of GPPC, but the color strength of GPPC was 1/2 that of PFSPPC. Treatment of PFSPPC with aluminum potassium sulfate(0.2~0.3%, w/w) best improved its stability. The improved RRPs of PFSPPC were 45.16~47.31% in sun light irradiation, 55.91~60.22% in fluorescence irradiation, and 76.34~75.97% in dark storage conditions. In substituting aluminum potassium sulfate for chitosan, an amount of 0.2~0.3%(w/w) was suitable, giving similar results in improving pigment stability for all concentrates tested. Also, freeze-dried PFSPPC powder was manufactured as a substitute for dextrin, and also as a substitute for chitosan to the extent of 0.25%(w/w). The results of storage stabilite for freeze-dried PFSPPC and GPPC powder over 15 days, irradiation were, PRRs of 74.47~89.36% and 61.54~76.92%, respectively. The stability improving effect of freeze dried PFSPPC powder was confirmed by the results of storage experiments at various conditions. The use of freeze-dried PFSPPC powder was therefore confirmed to be an effective treatment for general foods.

• 한국응용과학기술학회지
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• 제30권2호
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• pp.233-243
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• 2013

무지개 빛을 내는 무기진주광택안료는, 내광성, 내용제성 및 내열성 등이 물리적 화학적 안정성이 우수하여 다양한 분야에서 응용되고 있다. 본 연구는 수열합성방법을 사용하여 마이카 티타니아에 파란색 코팅 안료인 염화코발트를 기본으로 화장품 안료로 사용되는 진주광택안료를 합성하였다. 코발트에 의한 안료의 색상을 보완하고자 코발트와 금속 염의 비를 달리하여 안료를 코팅하고, 이를 통해 금속염의 종류에 따라 다양한 색차값을 구현하는 진주광택 안료를 합성하였다. 코발트와 첨가된 금속 염 전구체의 조성비와, 금속 염의 종류에 따라 코팅 특성과 색상을 조절할 수 있었고, 안료의 다양한 색상변화 특성을 색차계를 통해 확인 하였다. 합성된 안료는 SPM, SEM, XRD, EDS 기기를 통해 특성을 분석하였다.

• 한국산학기술학회논문지
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• 제13권8호
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• pp.3800-3805
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• 2012

본 논문에서는 도심 열섬현상 방지 및 에너지 효율을 높이기 위하여 적외선 반사율이 30%이상인 건물 내 외장재용 흑색 차열안료 및 도료에 대한 연구를 하였다. 안료는 $Fe_2O_3$과 $Cr_2O_3$의 혼합원료를 $900{\sim}1,200^{\circ}C$에서 소성하여 합성하였으며, 도료는 합성한 안료에 아크릴수지와 기타첨가제를 사용하여 제조하였다. 연구결과, Cr과 Fe을 1:0.9 몰비로 혼합하여 $1,000^{\circ}C$에서 소성한 안료의 발색도가 가장 우수하였고, 차열안료 20%에 분산제 1.5%를 첨가하여 제조한 차열도료로 $125{\mu}m$ 두께의 도막을 형성시켰을 때 적외선 반사가 가장 우수하였다. 차열도료와 일반도료의 표면온도 차이는 $36.5^{\circ}C$로 나타났으며 700~2,500nm 파장대의 적외선 반사율(TSR)은 39.3%로 측정되었다. 또한, 500시간의 내후성 평가에서 색상변화는 거의 나타나지 않았다.

• Journal of Photoscience
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• 제9권2호
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• pp.341-343
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• 2002

Bacteriochlorophyll(BChl)-c containing species of green sulfur photosynthetic bacterium Chlorobium (ChI.) vibrioforme, which has BChl-d mainly, was detected. We obtained colonies on agar plates by spreading the liquid culture of ChI. vibrioforme f. sp. thiosulfatophilum strain NCIB 8327 which contained the high ratio of BChl-c/BChl-d, and transferred each colony into a new liquid medium. These cultures after growing were found to be classified into two categories. One possessed BChl-d as a light-harvesting pigment and the other did BChl-c. No colonies examined here contained both BChls-d and c. Therefore, the presence of both BChls-d and c in our cultures of ChI. vibrioforme was ascribed to the coexistence of two different cells which had BChl-d and c as the chlorosomal pigment, respectively. The change of pigment composition observed in our liquid cultures can be thus explained by the difference of growth rates between two kinds of cells.

• 한국재료학회지
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• 제24권1호
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• pp.43-47
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• 2014

NiO-doped hibonite pigments were synthesized by the solid state method to get stabilized blue color pigment in both oxidation and reduction atmospheres. Optimum substitution condition with NiO for hibonite blue pigment was investigated. Experimental results were comparable to those of previous cobalt-minimization studies performed with other phosphate- or oxide-based cobalt-containing ceramic pigments (having olivine ($Co_2SiO_4$), spinel ($CoAl_2O_4$), or with co-doped willemite ($(Co,Zn)_2SiO_4$) structures). Composition was designed varying the NiO molar ratio increasing with $SnO_2$. The optimum substitution content is 0.93 mole NiO with 0.75mole $SnO_2$. The characteristics of the synthesized pigment were analyzed by XRD, Raman spectroscopy, SEM, and UV-vis. Synthesized pigment was applied to a lime-barium glaze with 10 wt% each and fired at an oxidation atmosphere of $1250^{\circ}C/1h$ and a reducing atmosphere $1240^{\circ}C/1h$. Blue color was obtained with $L^*a^*b^*$ values at 43.39, -6.78, -18.20 under a reducing atmosphere and 41.66, -6.36, -14.7 under and oxidation atmosphere, respectively.

• 한국식품저장유통학회지
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• 제11권1호
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• pp.42-46
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• 2004

치자로부터 청색 및 황색색소, 고량으로부터 암갈색 색소를 주정을 이용하여 추출ㆍ농축하여 60$^{\circ}$Brix 농도의 추출물을 회수하였는데, 각각의 수율은 0.68, 1.97, 0.63% (w/w)였다. 이들을 대두유: 물: 유화제: 치자청: 치자황: 고량색소=8: 22: 42: 10: 15: 13 (w/w)의 비율로 혼합하고 균질화하여 유용성 천연 검정색소를 얻었다. 이 색소를 대두유에 용해시킨 결과 대두유의 품온이 30∼4$0^{\circ}C$ 범위에서 가장 높은 용해도를 나타내었다. 대두유에 한 번 용해된 색소물질은 혼합 대두유의 품온을 2$0^{\circ}C$ 이하로 유지하여도 재분리현상이 발생하지 않는 것으로 확인되었다

• 한국세라믹학회지
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• 제56권3호
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• pp.298-301
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• 2019

This paper details the synthesis of α-FeOOH (goethite) rods through the reaction of iron (III) nitrate with KOH as a strong base, and shape control of the particles for use as a yellow inorganic pigment. The crystal phase of the α-FeOOH crystal with OH content according to the addition of KOH and the change in morphology were investigated. The optical properties varied with the aspect ratios, and the yellowness increased with increasing aspect ratio. However, the enhanced chromaticity characteristics reversed beyond a certain critical aspect ratio. Thus, the relative optimal aspect ratio of the α-FeOOH rods as a vivid yellow inorganic pigment was derived. The morphology and coloration of the prepared rods were investigated in detail using X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-vis spectroscopy, and CIE Lab color parameter measurements.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2000년도 추계학술발표대회 및 bio-venture fair
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• pp.321-324
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• 2000

Monascus purpureus ATCC 16365에 의한 5-liter 배양기에서 pH 조절을 통하여 세포외로 이차대사물인 수용성 적색소의 생산 증가 현상 와 황색소 보다 적색소로의 대사과정을 촉진시켜 적색소의 생산성을 향상시킬수 있는지의 가능성에 대하여 실험을 수행하였다. 황색소와 적색소의 분석은 UV-Vis spectrophotometer를 이용하여 각각 385nm 와 495nm에서 측정하였다. 실험결과 곰팡이의 최대균체량과 황${\cdot}$적색소를 포함한 총 색소 생산양은 pH 8보다 pH 4.0-5.5인 산성조건에서 2배 및 4배정도 증가하였다. 적색소 및 황색소의 전구물질인 홍색소는 pH 4.0에서 많이 생성되며 또한 홍색소에서 적색소로의 대사과정도 산성 조건 하에서 촉진된다고 보고되었다. 본 실험에서도 같은 경향을 보였으며 또한, 산성 조건 하에서 특히 수용성 적색소가 곰팡이 세포 외로 유출되는 양이 증가하는 경향을 나타내었다.

• 한국염색가공학회지
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• 제23권2호
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• pp.90-99
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• 2011

The aim of this study is to develope eco-printing method using natural pigments and chitosan as a natural binder. Three chitosans with different molecular weights were employed to find appropriate conditions including chitosan concentration and pigment/binder ratio. Dye uptake, color and fastnesses of the printed fabrics were evaluated to find optimum conditions within the range of experiments carried out in this study. The effectiveness of chitosan as a printing binder was examined in comparison with color, dye uptake, and fastnesses of conventional synthetic binder and guar gum. It was found that chitosans with low or medium molecular weight were appropriate. Using low molecular weight chitosan, optimum concentrations were 1.7% for charcoal, madder and chlorophyll, whereas 2.2% for ocher, yellow soil, indigo and cochineal. Regardless of molecular weight and concentration of chitosan, the color fastnesess of fabrics printed with mineral pigments were superior to those of the fabrics printed with plant and animal pigments. As pigment/chitosan ratio became higher, rubbing fastness was decreased by 1-3 grade. The colorfastness of printed fabric with chitosan binder was similar to that with synthetic binder, which was higher than that with guar gum.

• 생명과학회지
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• 제17권1호
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• pp.137-142
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• 2007

Monascus purpureus KFRI 1134 균주에 대해 UV ($235_{nm}$, 30 second) 조사를 통한 변이주 형성을 유도하여 Monascus sp. MK2-2를 분리하였다. 홍국 천연색소 생산의 최적조건은 rice powder 0.3%와 0.2% yeast extract, 0.3% $NH_4H_2PO_4$의 배지 조성에서 초기 pH 5.0, 배양온도 $30^{\circ}C$ 및 배양기간은 5일이었으며, 홍국 천연색소 생산에 미치는 탄소원의 영향은 wheat flour > rice powder > fructose 순으로 높았다. 질소원은 sodium nitrate > $KNO_3$의 순서로 생성능이 높았으며, C/N ratio가 $17\sim22$일 때 색소의 생성능이 우수하였다. Anti-thrombosis activity 측정결과 Monascus sp. MK2-2 추출물은 aspirin과 유사한 항혈전 기능을 지니고 있음을 알 수 있었다.