The purpose of this study was to investigate the possibility of using air potato (Dioscorea bulbifera) powder to make sponge cakes. The sponge cake batter was made by adding 0, 10, 20, 30, and 40% of air potato powder, and the resultant anti-oxidative properties and quality characteristics were analyzed. The study showed that the height, batter yield, and loss rate of sponge cakes decreased as increasing amounts of air potato powder were added, but the weight, viscosity, moisture content, and specific gravity increased. An evaluation of the color showed that the L and b values were highest in the control group but the a value was highest in the 40% group. There was no significant difference between samples in terms of cohesiveness, although the study showed a significant increase in the hardness, chewiness, and gumminess as the quantity of air potato powder in the sponge cakes increased. The total polyphenol content and DPPH radical scavenging activity increased noticeably as more air potato powder was added to the sponge cakes. The results thus showed that the study groups with the addition of air potato powder showed higher antioxidant activity than the control group.

This study compares the characteristics of a compact TiO2 (c-TiO2) powdery film, which is used as the electron transport layer (ETL) of perovskite solar cells, based on the manufacturing method. Additionally, its efficiency is measured by applying it to a carbon electrode solar cell. Spin-coating and spray methods are compared, and spraybased c-TiO2 exhibits superior optical properties. Furthermore, surface analysis by scanning electron microscopy (SEM) and atomic force microscopy (AFM) exhibits the excellent surface properties of spray-based TiO2. The photoelectric conversion efficiency (PCE) is 14.31% when applied to planar perovskite solar cells based on metal electrodes. Finally, carbon nanotube (CNT) film electrode-based solar cells exhibits a 76% PCE compared with that of metal electrodebased solar cells, providing the possibility of commercialization.

An increasing trend embracing the 2030 generation mindset through the new word ‘newtro’, which means reinterpreting the past and selling it in the present, has been gaining traction. The 2030 generation who seek new experiences and desserts is growing. The unique dessert market is expected to continue to grow in the future. Thus, this study devised a pine needle madeleine. Madeleines were made by varying the proportions of pine needle powder added to 0%, 1%, 3%, 5%, and 7%, and specific gravity, moisture, color, physical properties, and antioxidant properties were measured. The L-value decreased significantly (p<0.001) as the amount of pine needle powder added increased, and the a-value increased (p<0.001). The total polyphenol content, DPPH, and ABTS gradually increased significantly (p<0.001). Through this study, it was possible to confirm the quality and characteristics of madeleines using pine needle powder, which has excellent antioxidant properties, and it will become basic data for the development of various desserts using pine needle powder.

본 연구는 발효노니 다당체 추출물(Vitalbos)을 건강기능 식품 소재로 활용하기 위해 DAA, 총당 함량, 단당류 3종 (galacturonic acid, glucose 및 galactose)을 지표성분으로 설정하고, 지표성분에 대한 효과적인 분석법 설정 및 검 증을 위해 수행되었다. 기존에 보고된 분석법 검증 방법 을 수정하여 특이성, 직선성, 정밀성, 정확성, 검출한계 (LOD) 및 정량한계(LOQ)를 고성능 액체크로마토그래피와 페놀-황산법을 이용하여 측정하였다. 그 결과 DAA 및 단 당류 3종의 표준용액과 Vitalbos의 머무름 시간이 일치하 였으며 스펙트럼 또한 동일하여 분석법의 특이성을 확인 하였다. 지표성분의 검량선 상관계수(R2)는 0.9995-0.9998 범위로 0.99 이상의 우수한 직선성을 나타냈다. Intra-day 및 inter-day 정밀도는 0.14-3.01%의 범위로 5% 미만의 우 수한 정밀도를 나타냈고 회수율은 95.13-105.59% 범위에 서 우수한 정확도를 보였다. DAA 분석의 LOD와 LOQ는 각각 0.39 μg/mL 및 1.18 μg/mL이었으며 총당 함량의 LOD 및 LOQ는 각각 0.84 μg/mL 및 2.55 μg/mL로 측정 되었다. 단당류 3종에 대한 LOD는 0.48-0.81 μg/mL의 범 위였으며, LOQ는 1.45-2.44 μg/mL 범위에서 정량분석이 가능한 것으로 나타났다. 분석법 검증 결과, 특이성, 직선 성, 정밀성 및 정확성 모두 우수한 분석법임을 검증하였 으며, LOD와 LOQ 또한 Vitalbos 분석에 적합하였음을 확 인하였다. 검증된 분석법을 이용하여 Vitalbos의 지표 성분 함량을 측정하였을 때, DAA, 총당 함량, galacturonic acid, glucose 및 galactose의 함량은 각각 2.31±0.06 mg/dry weight g, 475.92±5.95 mg/dry weight g, 72.83±1.05 mg/dry weight g, 71.63±2.44 mg/dry weight g 및 67.30±2.31 mg/dry weight g으로 측정되었다. 본 연구에서 검증된 분석법을 사용했을 때 Vitalbos의 지표성분 3종에 대하여 우수한 재현성으로 정 량분석이 가능하였으며, 건강기능식품 소재로의 품질관리에 기여할 수 있을 것으로 판단된다.

This study examined the antioxidant activity and quality of Jeung-pyun prepared with different concentrations of hardy kiwi powder at 0%, 2.5%, 5%, 7.5%, and 10%. When the moisture content of Jeung-pyun was between 49.94-53.33%, the pH measurement showed a significant decrease with the increase of the hardy kiwi powder from 3.95 to 4.82. The L (lightness) values and the (redness) values decreased, whereas the b (yellowness) values increased with increasing amounts of hardy kiwi powder. The study showed a significant decrease in hardness, chewiness, and gumminess as the proportion of hardy kiwi powder in the Jeung-pyun increased. The total polyphenol content and DPPH radical scavenging activity increased noticeably as more hardy kiwi powder was added to the Jeung-pyun. As a result, the study groups with added hardy kiwi powder showed higher antioxidant activity than the control groups. Based on the results, this study recommends hardy kiwi as a good ingredient for enhancing the functionality of Jeung-pyun.

This study investigated the quality characteristics of emulsion-type chicken breast sausages containing black soldier fly larvae (BSFL) powder. The chicken breast and BSFL powder were added at various mixing ratios (C:chicken breast 56% and BSFL powder 0%, 1%:chicken breast 55% and BSFL powder 1%, 2%:chicken breast 54% and BSFL powder 2%, 3%:chicken breast 53% and BSFL powder 3%). The pH, moisture content, and water holding capacity of the sausages increased with the powder amount. In the instrumental color evaluation, the L* and b* values were significantly different among the samples (p<0.05). However, there was no significant difference in a* value (P>0.05) with the amount of powder added. Volatile basic nitrogen and acid value tended to increase with the amount of BSFL powder. The total phenolic content tended to increase, but the value of IC50 according to DPPH radical scavenging decreased as the amount of powder increased. This study concluded that BSFL powder can be used in meat products processing as a substitute for meat protein and may also improve antioxidant activity.

본 연구는 비산소 분쇄 및 포장이 해조류 분말의 색도, 항산화활성 및 미생물 수에 미치는 영향을 조사하였다. 대조구로는 산소 조건하에서 분쇄 및 포장을 진행하였다. 색도는 대조구가 저장기간이 지남에 따라 L값과 b값은 감소하고 a값이 증가하여 갈변현상이 일어나는 것을 확인하였다. 또한, 총 페놀함량 (9.8~8.0mg GAE/100g dw), DPPH (12.57~11.00mg BHAE/100g dw), ABTS (13~8.4mg AAE/100g dw) 및 FRAP (11.2~8.0mg Fe(II)/100g dw)활성이 모두 감소하는 것으로 나타났다. 반면에, 진공-질소치환에 의한 비산소 분쇄 및 포장의 경우 유의적으로 차이가 없는 것으로 나타났다. 미생물수는 대장균군, 일반세균수, 효모 및 곰팡이를 분석하였고 대장균군과 곰팡이는 모든 샘플에서 불검출되었다. 대조구는 0~8주차에서 일반세균수와 효모가 각각 1.52~1.96 log CFU/g, 0~1.77 log CFU/g으로 증가하는 것으로 나타났다. 비산소 분쇄 및 포장 조건은 0~8주차에서 일반세균수와 효모가 각각 1.52~1.53 log CFU/g, 0~1.25 log CFU/g으로 각각 나타나 일반세균수는 유의적으로 차이가 없었으나 효모는 약간 증가한 것으로 나타났다. 따라서, 색도유지, 높은 총 페놀함량 및 항산화 활성 유지, 일반세균 및 효모의 성장 억제를 위해서는 진공-질소치환에 의한 비산소 분쇄 및 포장 조건하에서 품질특성과 미생물수를 유지하는데 효과적일 것으로 판단된다.

국내 음식부산물 발생량은 연간 약 500만톤으로 그 중 70 %가량은 퇴비화 또는 사료화로 자원화되고 있다. 최근 비료공정규격상 음식부산물 건조분말(DFP)이 혼합유기질비료 및 유기복합비료의 원료로 사용할 수 있게 되었지만 아직 적정사용기준에 대한 설정이 미흡한 상태이다. 이에 본 연구는 수집 시기별 음식부산물 건조분말의 화학적 특성을 평가하고 음식부산물 건조분말이 혼합된 혼합유기질비료의 사용량에 따른 작물 및 토양화학성 변화에 대해 평가하고자 하였다. 처리구는 무처리(NF), 무기질비료처리구(NPK, N-P2O5-K2O=32-7.8-19.8 kg 10a-1), 음식부산물 건조분말 단독처리구(DFP), 시판혼합유기질비료(MOF), 음식부산물 건조분말 혼합유기질비료 처리구(DFPMOF)이며 DFPMOF 처리구는 100, 200, 400 및 600%로 구분하여 설정하였다. DFP, MOF 및 DFPMOF 처리구는 질소비료 사용량을 기준으로 하여 비료처리를 하여 작물 재배실험을 진행하였다. 음식부산물의 화학적 특성은 시기별에 따라서 유의적인 차이가 없었으며 중금속 함량 또한 기준에 적합한 수준이었다. 배추 생산량은 DFPMOF 처리구가 6,280 kg 10a-1로 NPK처리구(7,000 g kg-1)와 가장 유사하였으며 질소이용효율 또한 유사한 경향이었다. 토양 pH는 DFPMOF 사용량이 증가함에 따라 감소하는 경향이었으며, EC, OM 및 Ex. K는 DFPMOF 사용량이 증가함에 따라 감소하는 경향이었다. 이를 통해 DFPMOF 는 질소비료사용량 기준으로 처리하였을 때 가장 적합할것으로 판단되나, 적정사용기준을 설정하기 위해서는 장기간 연용시험을 통한 환경영향평가가 필요할 것으로 사료된다.

The purpose of this study was to examine the quality characteristics of cookies made with Angelica gigas Nakai fermented by Lactobacillus paracasei. As the content of Angelica gigas Nakai fermented by L. paracasei (AFL) powder increased, the pH of the cookies decreased from 6.3 to 5.2. There was no significant difference in the moisture content depending on AFL powder content. The content of reducing sugar also increased with increasing AFL powder content. Regarding the surface color of the cookies, the L- and b-values decreased with increasing AFL powder content, whereas the a-value increased. As the AFL powder content increased, the total polyphenol content and ABTS and DPPH radical scavenging activities significantly increased. Cookies with 8% AFL powder (AC8) had the highest levels of 107.16 mg%, 38.69%, and 65.56%, respectively. The texture, adhesiveness, and cohesiveness of the cookies with various AFL powder levels were not significantly different, and hardness, springiness, gumminess, and chewiness showed no tendencies toward changes. Taken together, these results showed that when AFL powder was added to cookies, bioactivities such as antioxidant activity increased, making AFL powder a good material with high potential for use in commercially baked products.

Two kinds of mesocarbon microbeads (MCMBs) with different chemical composition have been synthesized. The MCMBs were molded and heat treated at temperatures above 2000 °C to obtain graphite blocks. The effects of chemical composition of MCMBs on the pore morphology, carbon texture and thermal properties of the derived graphite blocks have been explored. The pore morphology was investigated by small angle X-ray scattering technique and a graphitization-induced morphology transition was observed. When the graphitic crystallite size exceeded a threshold value, the association of crystallites and migration of randomly distributed pores took place extensively. For the graphite blocks made of MCMBs which had light components with higher aromaticity value, the growth of crystallites caused a significant enhancement in thermal conductivity for the specimens. However, for the other kind of MCMBs, their light components tended to form solid porous carbon texture after graphitization, and the thermal conductivity coefficients of their graphite blocks could only increase slightly as crystallites grew. It was suggested that the thermal resistance at the granule’s boundary became noticeable in the latter case and thus the growth of thermal conductivity coefficients was prominently hindered.

The main objective of the research was to deposit thin films of silver on a graphite carbon paste in a phosphate buffer medium using an electrochemical method. To construct a nitrofurazone detection sensor that is highly sensitive. Different manufacturing parameters, such as electrodeposition potential, pH effect, potential scan rate effect, and number of scan cycles, were examined in this section. The parameters were optimized to improve the deposited silver layers various electrocatalytic characteristics. The Nitrofurazone reduction process is diffusion controlled, as seen by the linear variation of Epc with log(v). The constructed Ag-NPs@CPE electrod has excellent electrical characteristics a large active surface area and low background with extremely high electrical conductivity, according to structural and electrochemical characterizations such as Scanning electron microscopy, X-ray diffraction (XRD) and cyclic voltammetry. The constructed sensor has a very remarkable analytical performance for nitrofurazone molecule identification, with a very low detection limit of about 10– 8 M. The detection of nitrofurazone using our Ag-NPs@CPE sensors in real samples contaminated with the antibiotic nitrofurazone, such as tap water and urine. In the selected sample, the electroanalytical findings reveal a very satisfactory recovery rate of more than 94 percent.

To develop quality-improved muffins, the influence of the partial replacement of wheat flour with lemon balm powder (LBP) on their quality characteristics was analyzed. Studies were carried out to examine the supplementation of different percentages of LBP (2%, 4%, 6%, and 8%) on the quality characteristics of LBP muffins. The incorporation of LBP significantly affected the physicochemical parameters of muffins. Such incorporation at different levels significantly decreased pH, moisture content, baking loss, hardness, and color parameters, including L*, a*, and b* values of muffins (p<0.05). No significant effect of LBP substitution was found in height changes (p>0.05). Finally, the consumer acceptance test indicated that the highest levels of LBP incorporation (i.e., 8%) had a considerably adverse effect on consumer preferences in all attributes. In contrast, muffins with moderate levels of LBP (4%) showed a good and satisfactory sensorial acceptance in general. Thus, LBP was successfully employed in muffins, improving quality and broadening its potential applications in other bakery products.

This study was performed to evaluate the quality characteristics and antioxidant activity of Nurungji by varying the purple sweet potato powder addition time (AR: added after rice cooking, BR: added before rice cooking) and powder ratio (0, 2, 4, 6, 8%) on the prepared rice during Nurungji’s manufacturing. In both AR and BR samples, water binding capacity, soluble solid content, reducing sugar, and hardness increased with an increasing proportion of purple sweet potato powder; however, the pH and moisture content decreased. The L value and b value decreased and increased with the influence of anthocyanin in purple sweet potato powder. The total polyphenol, flavonoid, anthocyanin contents, DPPH, and ABTS radical scavenging activity were highest in Nurungji with 8% of purple sweet potato powder. Moreover, AR samples showed higher antioxidant activity than BR samples. Based on the study results above, the preparation of Nurungji with 8% purple sweet potato powder by AR process was more favorable based on the content of antioxidants and antioxidant activity.

Complexation of actinides and lanthanides with carboxylic organic ligands is known to facilitate migration of radionuclides from deep geological disposal systems of spent nuclear fuel. In order to examine the ligand-dependent structures of trivalent actinides and lanthanides, a series of Eu(III)-aliphatic dicarboxylate compounds, Eu2(oxalate)3(H2O)6, Eu2(malonate)3(H2O)6, and Eu2(succinate)3(H2O)2, were synthesized and characterized by using X-ray crystallography and time-resolved laser fluorescence spectroscopy. Powder X-ray diffraction results captured the transition of the coordination modes of aliphatic dicarboxylate ligands from side-on to end-on binding as the carbon chain length increases. This transition is illustrated in malonate bindings involving a combination of side-on and end-on modes. Strongly enhanced luminescence of these solid compounds, especially on the hypersensitive peak, indicates a low site symmetry of these solid compounds. Luminescence lifetimes of the compounds were measured to be increased, which is ascribed to the displacement of water molecules in the innersphere of Eu center upon bindings of the organic ligands. The numbers of remaining bound water molecules estimated from the increased luminescence lifetimes were in good agreement with crystal structures. The excitation-emission matrix spectra of these crystalline polymers suggest that oxalate ligands promote the sensitized luminescence of Eu(III), especially in the UV region. In the case of malonate and succinate ligands, charge transfer occurs in the opposite direction from Eu(III) to the ligands under UV excitation, resulting in weaker luminescence.

Sulfate-rich waste powder containing a radioactive nuclide is generated from chemical decontamination process and radioactive liquid waste treatment using ion exchange resin. The radioactive sulfate-rich waste powder should be stabilized for final disposal. The techniques for immobilization of the radioactive sulfate-rich waste powder such as hydraulic cement, geopolymer, and iron phosphate glass have been applied, however, there are limitation in these techniques. Firstly, the hydraulic cement cannot applied to the wastes containing high concentration of sulfate because the expansion, cracks, and disintegration can be happened in the waste form. Geopolymer has a low density although they can be used as a good binder. The iron phosphate glass can be utilized, however, a considerable amount of SO2 gas is emitted due to the high sintering temperature. In this study, immobilization of radioactive sulfate-rich waste powder was carried out to resolve above problems by applying low temperature sintering method using a low-melting glass. As a result, it was confirmed that the waste form has a high bulk density. The compressive strength of the waste form was over 40 MPa, which is higher than the acceptance criteria (≥ 3.44 MPa). From ANS 16.1 test, it was verified that the waste form met the acceptance criteria of the leachability index (≥ 6). It was also confirmed that the waste form was chemically durable through product consistency test (PCT). In addition, the chemical stabilities of waste forms were compared following the sintering condition and the composition of the waste forms. The difference of the chemical stability was explained by difference in the abundance of chemical form obtained from the sequential extraction test.

The mixing powder of vitrification material and metallic oxide sludge was solidified by hot isostatic press method and was tested to check whether the solidified waste disposal acceptance criteria were met or not. From various contaminated tank in nuclear power plants, and other nuclear energy facilities, radioactive sludge based on metallic oxide can be generated. The most of tank consist of stainless steel can be oxidated by the long-term exposure on oxygen and moisture, and then can be made sludge layer based on metallic oxide on the inner wall of contaminated tank. Radioactive sludge waste should be solidified and disposed. Melting and hardening is the most basic method for solidification. The melting points of metallic oxide of stainless steel as Fe3O4, NiO, Cr2O3 are 1597, 1955, 2435, respectively. Those are very high temperature. To melt these metallic oxides, a furnace capable of raising the temperature to a very high temperature is required, which requires a lot of thermal energy, which may lead to an increase in disposal cost. Therefore, it is necessary to lower the melting point and solidify non-melted metallic oxide powder by adding vitrifying material powder as Na2O, SiO2, B2O3. The more vitrification material is added, the easier it is to solidify the sludge based on metallic powder at a low temperature, but there is a problem in that the total waste volume increases due to the addition of vitrification material. In this study, the mixing ratio and temperature conditions that can fix the sludge while adding a minimum amount of vitrification material will be confirmed. Mixing ratio conditions of the vitrification material and sludge powder are 10:90, 15:85, 20:80, 25:75. To fix the metallic oxide sludge by melting only the vitrification material without completely melting the metallic oxide, compression by external pressure is required. Therefore, the HIP (Hot Isostatic Pressing) method was used to solidify the metallic oxide sludge by simultaneously heating and pressurizing it. Because the softening points of most of vitrification based on Na2O, SiO2, B2O3 are ranged from 800 to 1000, temperature conditions are 800, 900, 1000. Since the compressive strength for disposing of the solidified materials was 3.4 MPa, the maximum pressure condition was set to 5000 psi (about 34 MPa), which is 10 times 3.4 MPa. And optimal mixing ratio, temperature, pressure conditions that meet the solidified waste disposal acceptance criteria will be found.

This study evaluate the antioxidant activity and quality characteristics of muffins prepared with the addition of Cirsium nipponicum powder in the ratio of 0, 2, 4, 6, and 8% and confirm the possibility of using Cirsium nipponicum as a functional food. As the proportion of Cirsium nipponicum powder increased, the specific gravity of the muffins increased while their height, specific volume, moisture content and pH decreased. The baking loss rate of the samples prepared with the addition of Cirsium nipponicum powder was higher than in the control group. The ‘L’ and ‘b’ values decreased with the increase in the Cirsium nipponicum powder content, while the ‘a’ value increased. The evaluation of texture showed that hardness, chewiness, and gumminess increased with an increase in the Cirsium nipponicum powder content. As per the results of the consumer acceptability test, the 4-6% Cirsium nipponicum powder group showed higher scores than the other groups in the characteristics of color, flavor, taste, and texture, and the 4% group secured the highest score for overall acceptance. Also, with the increasing addition of Cirsium nipponicum powder, the antioxidant activity levels increased, as indicated by the total phenolic content, DPPH, and ABTS radical scavenging activities and reducing power. Based on these study results, muffins prepared with the addition of 4% of Cirsium nipponicum powder showed the best functional and sensory qualities.

화석연료의 사용에 따른 지구 온난화 및 기상 이변으로 인하여 온실가스 저감 문제가 대두되고 있으며, 그에 따 라 에너지 소모 없이 셀프 쿨링이 가능한 소재에 대한 연구가 활발히 진행되고 있다. 그 중에서도 실크는 천연 쿨링 소재로 알려져 있으나, 기존의 혼합 공정에서는 실크를 화학적으로 분말화 시키기 때문에 복사 냉각 효과가 사라지는 문제점이 있어, 복사냉각을 위한 필름 또는 코팅제 형태로 제조하는데 어려움을 겪고 있다. 본 연구에서는 실크 피브로인의 고유구조를 훼손 하지 않는 물리적 분쇄 공정을 거친 실크 분말을 사용하여 다양한 형태의 막을 제조하고, 코팅제로서의 적용가능성을 살펴보 고자 연구를 수행하였다. 이를 위해 실크 피브로인 분말이 도입된 전기방사 복합막 및 평막 형태의 복합막을 제조하였으며, 용액의 점도가 막 제조 및 제조된 막의 물성에 큰 영향을 미치는 것을 관찰하였다.

The purpose of this study is to improve the mechanical properties and develop manufacturing technology through self-soluble alloy powder flame spray coating on the surface of a run-out table roller for hot rolling. The roller surface of the run-out table should maintain high hardness at high temperatures and possess high wear, corrosion, and heat resistances. In addition, sufficient bonding strength between the thermal spray coating layer and base material, which would prevent the peel-off of the coating layer, is also an important factor. In this study, the most suitable powder and process for roll manufacturing technology are determined through the initial selection of commercial alloy powder for roll manufacturing, hardness, component analysis, and bond strength analysis of the powder and thermal spray coating layer according to the powder.