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CNF/산화전분 표면처리가 종이 물성 및 인쇄적성에 미치는 영향
황임정(Im Jeong Hwang),이용규(Yong Kyu Lee),원종명(Jong Myoung Won) 한국펄프·종이공학회 2017 펄프.종이技術 Vol.49 No.6
This study was carried out to investigate the effect of the surface treatment with CNF alone and/or CNF-oxidized starch mixtures on the physical properties and printability of paper. CNF has better fluidity than the oxidized starch during coating process, and its coverage was excellent even though the small amount was applied to paper surface. The surface roughness was somewhat reduced by the formation of thin film. The bulk of the paper showed no significant change when applied in small amounts of CNF and/or oxidized starch mixtures, but decreased as the application amount exceeded 5 g/㎡. The air resistance of paper was 853 seconds when it was applied with CNF only 2.35 g/㎡, and it was impossible to measure the air permeability regardless of the application amount when the mixtures of oxidized starch were applied on the paper surface. The tensile strength, tear strength, bending strength and folding endurance, as well as elongation, were improved by surface treatment with CNF and/or the mixtures of CNF and oxidized starch. The dry pick strength of the surface treated paper showed the lowest value in the CNF treatment, and it was improved with the increase of oxidized starch content. The wet pick strength was poor enough to be unmeasurable until CNF was applied by 2 times, and excellent results were obtained as the amount of oxidized starch added increased.
황임정(Im Jeong Hwang ),이용규(Young Kyu Lee),원종명(Jong Myoung Won) 한국펄프·종이공학회 2019 펄프.종이技術 Vol.51 No.1
In order to evaluate the possibility of producing aerogels using waste paper, white ledger and KOCC (Korea old corrugated container) were fibrillated to produce aerogels and their characteristics were compared with those of hardwood bleached kraft pulp. Grinding was performed at 5, 10, 15 and 20 times, and the concentration of fibrillated fiber was adjusted to 0.5, 1.0 and 1.5% in order to investigate the effect of fibrillation degree and the fibrillated fiber concentration. As the grinding progressed, the average fiber length decreased. In the case of white ledger, the increase of low shear viscosity was delayed. In the case of KOCC, little change was observed, which is closely related to the fibrillation characteristics of the fiber. The degree of polymerization of hardwood bleached kraft pulp and white ledger decreased as the number of grinding times increased. However, KOCC showed no significant change. As the grinding number and fibrillated fiber concentration increased, the specific surface area of the aerogels increased, but the average pore size decreased. These properties were closely related to the fibrillation characteristics of the fibers. As the pore size of the aerogels decreased, the absorption of water and oil decreased. The absorption of water by hydrophobic treatment of aerogels was significantly decreased, but the absorption of oil was improved for white ledger and KOCC.
White Ledger CNF를 이용한 종이 물성 개선
황임정(Im-Jeong Hwang),김진모(Jin-Mo Kim),이용규(Yong-Kyu Lee),원종명(Jong Myoung Won) 한국펄프·종이공학회 2018 펄프.종이技術 Vol.50 No.4
The effects of white ledger CNF addition on the drainage characteristics and paper properties were investigated in order to evaluate the possibility of white ledger CNF as a papermaking additive for improving paper properties. The white ledger CNF addition showed a tendency to delay the dewatering on the paper machine wire and did not show any difference from the HwBKP CNF. As a result of FAP (Final Air Permeability) measurement to predict the dewatering characteristic at the press part, the FAP value tended to be slightly increased by the addition of CNF, but the difference was not so large enough that the dewatering at press part would not be significantly deteriorated. The bulk was slightly decreased as white ledger CNF was added, but there was no difference according to the kind of raw materials used for CNF production. The air resistance was increased with the increase of white ledger CNF addition. The opacity of handsheet did not show a significant change even though white ledger CNF was added up to 2%. Tensile index, tear index and Taber stiffness of handsheet were all improved by white ledger CNF addition. Especially, tensile index was improved significantly by the addition of white ledger CNF addition. It was also confirmed that alkaline pretreatment of white ledger before grinding is not necessary when it is used as a papermaking additive.
알칼리 전처리가 white ledger를 이용한 NFC 제조 특성에 미치는 영향
황임정(Im Jeong Hwang),김진모(Jin Mo Kim),이용규(Yong Kyu Lee),원종명(Jong Myoung Won) 한국펄프·종이공학회 2017 펄프.종이技術 Vol.49 No.5
To evaluate the feasibility of NFC production using white ledger as a raw material, deinking and ash removal were carried out and fibrillation was performed with a grinder. In order to compare the fibrillation characteristics of white ledger, the fibrillation of HwBKP and SwBKP was performed in the same manner. Especially, white ledger is expected to be difficult to fibrillate by hornification phenomenon, so it is pretreated with 0.5, 1, 3 and 5% alkali solutions and then fibrillated. White ledger was found to be harder to fibrillate than HwBKP and SwBKP, and when pretreated with a low concentration alkali solution of up to 5%, fibrillation was remarkably improved. FTIR analysis showed no change in absorption band due to fibrillation and alkali pretreatment, and no apparent change in crystallinity and hydrogen bond index was observed. The CED polymerization degree of NFCs decreased with the progress of fibrillation, but the effect of alkali pretreatment was not clear. The average fiber length of NFC was decreased by fibrillation. In the case of HwBKP and SwBKP, the alkaline pretreatment effect on the average fiber length change was not clear. However, in the case of white ledger, the average fiber length was significantly decreased in the early stage of fibrillation and the difference from the untreated case was decreased as the fibrillation progressed. The relative specific energy consumptions in producing NFC at The relative specific energy consumptions in producing NFC at the same fibrillation level were 17.8 Wh/g for HwBKP, 25.1 Wh/g for SwBKP, and 37.4 Wh/g for white ledger, respectively. The specific energy consumption of the white ledger was reduced to 18.1 Wh/g when it is pretreated with 3-5% alkali solution.
생강(Zingiber officinale Roscoe) 뿌리, 줄기, 잎의 라디칼 소거 활성을 통한 산화스트레스 억제 효과
임푸름(Pu Reum Im),황혜정(Hye-Jeong Hwang),임정연(Jeong Yeon Im),황유진(Yu-Jin Hwang),남동건(Dong-Geon Nam),최정숙(Jeong-Sook Choe),황경아(Kyung-A Hwang) 한국식품영양과학회 2021 한국식품영양과학회지 Vol.50 No.2
본 연구에서는 신규 식품 원료로 등록된 생강 잎과 생강 줄기의 항산화 효과를 생강 뿌리와 비교 분석하였다. DPPH와 ABTS 라디칼 소거능에 의한 항산화력을 측정한 결과 모든 시료 추출물에서 농도 의존적으로 항산화력이 증가하는 경향이 나타났으며, 특히 100 μg/mL 농도에서 생강 뿌리(58%)와 생강 잎(35%)에서 우수한 항산화 효능을 확인하였다. NO 생성 억제 효과는 모든 시료에서 나타났으며, 특히 생강잎은 25~31%의 저해율을 보여 생강 뿌리(22~37%)와 유사하게 NO 생성 억제 효과가 나타나 우수한 효능을 확인하였다. 생강 줄기는 24~26%의 저해율을 보였으나 농도 의존성은 없었다. 세포 내 활성산소종 생성은 생강 뿌리(21~46%), 생강 잎(15~30%), 생강 줄기(2~11%) 순서로 억제 효과가 높게 나타났다. 항산화 기전을 확인하기 위해 항산화효소의 유전자 발현을 평가한 결과 생강 잎은 Cu/Zn-SOD와 Mn-SOD 유전자 발현을 높은 수준으로 증가시켰으며, GPx와 catalase는 생강 뿌리, 생강 잎, 생강 줄기 순서로 발현을 증가시키는 것으로 나타났다. 본 연구 결과를 통해 그동안 버려지던 생강 잎과 생강 줄기의 항산화 효과를 확인하였고 생강 잎에서 우수한 항산화 활성을 확인하여 향후 건강기능식품 소재로서 개발이 가능할 것으로 판단된다. 그러나 생강 잎에 관한 연구는 미비한 실정으로 향후 생강 잎추출물의 체내 생리활성 메커니즘 구명을 위한 동물실험 등의 추가적인 연구가 필요할 것으로 판단된다. In this study, the antioxidant effects of Zingiber officinale Roscoe leaves and stems which have been registered as new food ingredients were comparatively analyzed with Z. officinale Rosc. roots. The increase in antioxidant activity was concentration-dependent in all extracts, and excellent antioxidant activity was confirmed in the roots (58%) and leaves (35%) at 100 μg/mL. The inhibitory effect of nitric oxide production was found in all samples. In particular, the leaves showed an inhibitory rate of 25∼31%, an effect similar to that of the roots (22∼37%), confirming their excellent efficacy. The stems showed a 24∼26% inhibition rate, but the inhibition was not concentration- dependent. The inhibitory effect of the roots, stems and leaves of Z. officinale Rosc. on the reactive oxygen species production was highest in the roots (21∼46%), followed by leaves (15∼30%) and stems (2∼11%). Cu/Zn-superoxide dismutase (SOD) and Mn-SOD mRNA expressions were increased to high levels by the leaves. Glutathione peroxidase and catalase levels were in the increased in the roots, leaves, and stems, in that order. Through the results of this study, the antioxidant effects of Z. officinale Rosc. leaves and stems were confirmed, and excellent antioxidant activity was confirmed in the leaves. Z. officinale Rosc. leaves can therefore be considered for use as an antioxidant functional health food material in the future. However, since studies on the leaves are insufficient, additional studies in animals are needed to investigate the mechanism of the physiological activity of Z. officinale Rosc. leaves in the body.