• 한국식품영양학회지
• /
• 제13권4호
• /
• pp.383-389
• /
• 2000

한국산 자초 적색소의 안정성을 연구한 결과 적색소의 온도에 대한 영향은 40~8$0^{\circ}C$의 조건에서 1~2 시간 정도의 가열로는 색상의 변화는 거의 없으나 장시간 보관시 55$^{\circ}C$ 이상 에서는 시간의 경과에 따라 색상이 현저하게 변화하였다. 적색소의 햇빛에 대한 영향은 적색 및 녹색 포장에서는 색상이 안정 하였으나 황색 및 청색 포장에서는 심한 색상의 변화를 보였다. 적색소의 pH에 대한 영향은 pH 4~8의 조건에서 색상이 매우 안정하게 나타났으며 pH 10 이상에서는 색상의 변화가 심하게 나타났다. 적색소의 금속이온에 대한 영향은 KCl, NaCl 첨가에서는 색상이 거의 변화하지 않았으나 CaCl$_2$, FeCl$_3$, CoCl$_2$, AlCl$_3$, MnCl$_2$ 첨가시에는 완전히 다른 색상으로 변화하였다. 적색소의 구연산, 초산에 대한 색소 안정성은 양호한 편이며 특히 초산에서는 색상의 변화가 없었다.

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

• 한국미생물·생명공학회지
• /
• 제28권2호
• /
• pp.111-116
• /
• 2000

Cordyceps scarabaeicola KEFC-C252 균사체의 배양으로 생산되는 천연색소의 생산조건 및 색소의 정제방법을 조사하였으며, 분리된 색소의 항돌연변이 효과를 조사하였다. 색소의 생산에 적합한 배지는 1.5% sucrose, 2.5% yeast extract, 초기 pH5.5였다. Cordyceps scarabaeicola KEFC-C252를 $26^{\circ}C$에서 108시간 배양한 후에 색소생산이 최대에 달하였으며, 최적조건에서 Cordyceps scarabaeicola KEFC-C252는 1.2 g/liter의 색소를 생산하였다. 색소는 ethylacetate 추출, 산침전 및 결정화과정을 거치면서 정제하여 황색의 육각기둥 모양의 결정을 얻었다. 분리된 색소는 용액의 pH 변화에 따라 색상이 변하는 특성을 나타내었는데 알칼리성 용액에서 청색, 산성 용액에서 붉은색을 나타내었다. 분리된 색소는 4-NQO로 유도된 돌연변이를 억제하는 항돌연변이원성 물질이었다. 또 분리된 색소는 Salmonella typhimurium TA98과 TA100에서 자발적 돌연변이를 감소시켰다.

• Food Science and Biotechnology
• /
• 제14권2호
• /
• pp.275-279
• /
• 2005

The objective of this study was to investigate the color development and shelf-life effect of low-fat sausages (LFS) during refrigerated storage according to the additions of sodium lactate (SL), chitosan, and lac pigment. The LFS samples had $73{\sim}76%$ moisture, $3{\sim}4%$ fat, and $13{\sim}16%$ protein with a pH range of 6.4-6.6. The addition of chitosan ($MW\;=\;30{\sim}40\;kDa$) to LFS increased most textural properties. Hunter a (redness) values were increased by the addition of 0.05% lac pigment. The microbial growth of Listeria monocytogenes increased with increasing storage time. The addition of 2% SL and 0.3% chitosan with MW higher than $30{\sim}40\;kDa$ effectively inhibited the growth of L. monocytogenes. The microbial growth of L. monocytogenes was further reduced with increasing chitosan MW. These results indicated that the combination of SL with chitosans (MW > 30 kDa, 0.3%) and lac pigment (0.05%) improved shelf-life and color development in LFS during refrigerated storage.

• 한국식품영양과학회지
• /
• 제33권9호
• /
• pp.1544-1551
• /
• 2004

유색 감자(PL-6, PL-28, PL-31과 Jasim)에 함유된 수용성 색소인 anthocyanin의 pH, 당, ascorbic acid, 유기산과 광원에 대한 색소 안정성을 조사하였다. pH는 유색감자의 anthocyanin 색소 안정성에 영향을 주는 것으로 나타났는데, pH가 낮을수록 색도가 높고 안정하였으며 pH가 높아질수록 색소 파괴가 많아지는 경향을 나타내었다. 유색 감자의 anthocyanin 색소에 당 첨가 시 저장 기간동안 점차적으로 색소가 약간 감소하는 것으로 나타났다. Tartaric, citric, succinic acid와 같은 대부분의 유기산은 anthocyanin 색소의 안정성을 개선시킨 반면 malic, malonic acid는 색소의 안정성을 감소시켰다. 유기산 중 하나인 ascorbic acid만을 첨가했을 때 anthocyanin 색소 안정성은 계속 감소하였으나 thiourea를 함께 사용한 경우 anthocyanin 색소의 안정성 유지에 효과가 있었다. 암실, 형광 그리고 햇빛에 대한 유색감자 anthocyanin 색소의 안정성은 점차 감소하며 빛으로부터 색소를 차단함으로서 색소분해를 최소화할 수 있을 것으로 판단된다.

• 펄프종이기술
• /
• 제43권4호
• /
• pp.76-81
• /
• 2011

This study was carried out in order to develop a speciality functional coated paper, which can be recognized under a ultraviolet lamp. The special fluorescent whitening agent (FWA) which absorbs ultraviolet light (397~410 nm) and emits it as yellowish light (570~500nm) was used. The special FWA was applied in a coating color in two ways: (1) direct application to a coating color as a FWA; (2) application on pigment surface, drying it and application it as a fluorescence whitening pigments (colored pigments). The effects of the special FWA on coating color properties were tested and the distribution of colored pigments in coated paper was evaluated under a ultraviolet lamp. The results showed that the colored pigments didn't affect on coating color properties. Experimental results showed the possibility of producing a security coated paper using the special FWA. To produce a speciality functional paper, it was found to be proper to apply the special FWA in the form of colored pigment.

• 공업화학
• /
• 제28권1호
• /
• pp.95-100
• /
• 2017

본 연구에서는 Pigment Red 57:1의 다양한 합성 방법에 따른 입자 거동 및 그의 따른 색상, 점도, 및 분광학적 특성 등을 분석하기 위하여, 합성 시간, pH, 유도체 함량 및 결정화 온도 등의 변수를 이용하여 시료를 합성한 후 그 분산액을 제조하였으며, 그에 따른 특성을 비교 분석하였다. 시료들의 특성은 푸리에 적외선 분광기, UV-Vis 분광기, 입도 분석기, 색차계, X선 회절 분석계 등을 이용하여 비교 분석하였다. 그 결과 합성 조건 조절을 통하여 안료 입자의 크기를 다양하게 조절하는 것이 가능하였다.

• Food Science and Biotechnology
• /
• 제15권6호
• /
• pp.838-843
• /
• 2006

The chemical processes involved in the formation of green pigment in crushed garlic cloves were investigated based on the principle of pink pigmentation in macerated onions. Intact greening and non-greening garlic cloves were either left untreated or heated at $90^{\circ}C$ for 3 min to inactivate enzyme activities. First, a colorless ether soluble compound referred to as color developer reacted with glycine (among all free amino acids) in garlic to form a second compound insoluble in ether. The latter compound then reacted with formaldehyde to yield the green colored pigment. Alliinase activity was necessary for the production of color developer and for the development of green pigment. In greening garlic that had been heat treated, green pigmentation did not proceed due to the heat-inactivation of alliinase, but the addition of alliinase solution into the garlic homogenates restored the pigmentation. However, this phenomenon was not observed in non-greening garlic with or without heat treatment. Finally, the mechanism of green pigment formation in crushed garlicis similar to that of pink pigment formation in macerated onions.

• 한국응용과학기술학회지
• /
• 제28권3호
• /
• pp.335-344
• /
• 2011

The pearlesent pigment has received attention in a diversity of fields like cosmetics, inks, paints and so on. Ferric Ferrocyanide, one of the nano sized pearlescent pigment, is a kind of surface modification pigment that covers a metal oxidized substance or a coloring agent with uniform thickness. Characteristics of pearlescent pigment are various interference color, intense gloss effect and a three-dimensional effect. We synthesised the pearlesent pigment that ferric ferrocyanide can be deposited on the titania/mica surface by hydrothermal synthesis method. The process parameters are concentration of precursor, controlling pH and reaction temperature. The optimun conditions is that amount of iron(III) chloride hexahydrate is 3.1 wt% and amount of potassim ferrocynide trihydrate is 3.6 wt% in the started pH 4.5 at $70^{\circ}C$. The coating rate and coating efficiency of ferric ferrocyanide was about 1.47 % and 96.7 %, respectively. The synthesised pearlesent pigment was characterized by SEM, XRD, FT-IR and EDS.

• 한국염색가공학회지
• /
• 제33권2호
• /
• pp.79-86
• /
• 2021

This study investigated the effect of a pigment (C. I. Pigment Red 122) addition on mechanical properties of the epoxy resin, diglycidyl ether of bisphenol F (DGEBF) and G640 curing agent. The K/S value, thermal properties, tensile properties, and fracture toughness of the prepared epoxy samples were evaluated. When the pigment was added to the DGEBF/G640 epoxy system, the color of the epoxy resin changed to red from transparent and yellowish color, and the K/S value in the red region increased as the pigment content increased. When the pigment content was increased up to 0.1 phr, the tensile strength was improved up to 21.8 %, whereas the pigment content was over 0.1 phr, the tensile strength decreased. The fracture toughness was improves up to 23.1 % until the amount of pigment added was up to 0.2 phr, and then decreased when the amount of the pigment added was more than 0.2 phr. This attributed to the aggregation of the pigments in the epoxy resin when the amount of the pigment added was more than 0.2 phr. Therefore, the coloration of the epoxy resin with an organic pigment must be carried out very carefully because the coloration of epoxy resin affects its mechanical properties.