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Jiunnfwu Lee - One of the best experts on this subject based on the ideXlab platform.
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fourier transform infrared spectroscopic analysis of fruit peels before and after the adsorption of heavy metal ions from aqueous solution
Journal of Chemical & Engineering Data, 2011Co-Authors: Munusamy Thirumavalavan, Yiling Lai, Jiunnfwu LeeAbstract:For orange peel (OP), lemon peel (LP), and banana peel (BP) as adsorbents for removal of heavy metal ions such as Cu2+, Ni2+, Cd2+, Pb2+, and Zn2+ from aqueous solution, a simple FT-IR technique was used and discussed to study the variation in functional groups upon modification. Metal−carbon bond formation was witnessed by FT-IR during metal ion adsorption. All of these adsorbents were characterized by FT-IR, BET, and SEM. The presence of carboxylic and hydroxyl groups was confirmed by FT-IR. The FT-IR spectrum of lemon peel cellulose (LPC) showed well resolved peaks for carboxylic acid and hydroxyl groups compared to LP indicating the appreciable contents of carboxylic acid and hydroxyl groups in LPC. The widely used Langmuir adsorption isotherms were used to describe the adsorption equilibrium process. The adsorption capacity of the metal ions such as Cu2+ and Ni2+ was found to be more than those of other metal ions. Upon comparison of the adsorbents, surface modified LPC (LPCACS) was found to show enh...
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effective adsorption of heavy metal ions cu2 pb2 zn2 from aqueous solution by immobilization of adsorbents on ca alginate beads
Toxicological & Environmental Chemistry, 2010Co-Authors: Yiling Lai, Munusamy Thirumavalavan, Jiunnfwu LeeAbstract:The performance of adsorbent system consisting of orange peel cellulose (OPC), banana peel cellulose (BPC), orange peel cellulose immobilized Ca-alginate beads (OPCCA) and banana peel cellulose immobilized Ca-alginate beads (BPCCA) for the removal of Cu2+, Pb2+, and Zn2+ from an aqueous solution was tested. The widely used Langmuir isotherm model was utilized to describe the adsorption equilibrium process. OPC and BPC were characterized by SEM and Fourier transform infrared spectroscopy (FT–IR) techniques. The concentration of metal ions was varied in order to obtain optimum concentration level. The effect of pH was studied at different pH values. The role of cellulose in the case of OPC and BPC and the role of alginate in OPCCA and BPCCA were well understood leading to two different mechanisms in native and immobilized cellulose. OPC was found to be a better adsorbent among OPC and BPC, and Cu2+ was considered to be adsorbed more effectively than Pb2+ and Zn2+. The extent of enhancement of adsorption cap...
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cellulose based native and surface modified fruit peels for the adsorption of heavy metal ions from aqueous solution langmuir adsorption isotherms
Journal of Chemical & Engineering Data, 2010Co-Authors: Munusamy Thirumavalavan, Yiling Lai, Lingchu Lin, Jiunnfwu LeeAbstract:A viable and cost-effective technology was explored in this present task for removal of heavy metal ions such as Cu2+, Ni2+, Zn2+, Cd2+, and Pb2+ from aqueous solution using three fruit peels such as orange peel (OP), lemon peel (LP), and banana peel (BP). The surface of the LP and lemon peel cellulose (LPC) was chemically modified. All these adsorbents were characterized by FT-IR, BET, and SEM. The widely used Langmuir adsorption isotherms were used to describe the adsorption equilibrium process. The adsorption capacity of metal ions such as Cu2+ and Ni2+ was found to be more than that of other metal ions. Upon comparison of the adsorbents, surface modified LPC (LPCACS) was found to show enhanced adsorption activity. A comparative study of adsorption was carried out with activated carbon (AC) also from which it was inferred that the order of the adsorption capacity is as follows: LPCACS > LPC > AC > LP.
I S Park - One of the best experts on this subject based on the ideXlab platform.
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analyses of the practical adhesion strengths of the metal polymer interfaces in electronic packaging
Journal of Electronic Materials, 2002Co-Authors: J.y. Song, I S ParkAbstract:There is a plethora of techniques to measure the adhesion strength of metal/polymer interfaces. However, the practical adhesion strength, which is the work done in separating the film from the substrate (or one film from another), is very sensitive to the test methods and the mechanical effects, such as the residual stress, thickness and mechanical properties of the layers, strain rate, and phase angle. Deriving intrinsic-adhesion properties of the interfaces, which are independent of such parameters, from the practical adhesion-strength measurements is a formidable task. In the present work, data from the three commonly used adhesion tests; pull-out, 90°-peel, and T-peel tests are compared with the intrinsic-adhesion properties of the interface, such as the interface-fracture toughness or the interface-fracture energy, and their implications are discussed. Material systems analyzed were Cu-based lead frame/epoxy-molding compound (EMC) and Cu/Cr/polyimide.
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cohesive failure of the cu polyimide system
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2000Co-Authors: I S Park, Hoyoung LeeAbstract:Abstract The cohesive failure which occurs in the inside of the polymer near the metal/polymer interface was studied in the Cu/Cr/polyimide and Cu/CuCr/polyimide systems. The interface energy was varied by pretreating the polyimide surface by varying rf plasma power density, or by varying the Cr content in the CuCr alloy layer, respectively, and peel tests were conducted. Then, peeled metal strips were analyzed by AES and XPS, and correlations were made among the peel strength, the amount of carbide-like Cr–C bonds near the interface, and the polyimide thickness on peeled metal films inferred from the AES depth profiling. Results indicate that the peel strength increased with the rf power density at a constant metal thickness and that the thickness of polyimide adhering to peeled metal films increased with the peel strength, which was related to the amount of carbide-like CrC bond near the interface affecting the interface energy. In the case of specimens with the same plasma treatment but various metal layer thickness, the thickness of polyimide on peeled metal films remained constant even though the peel strength increased with the metal layer thickness.
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an x ray study on the mechanical effects of the peel test in a cu cr polyimide system
Acta Materialia, 1998Co-Authors: I S ParkAbstract:Abstract In order to understand the effects of plastic deformation and the interfacial fracture energy on the peel strength, thickness of the metal layer and the pretreatment conditions of polyimide were varied in the Cu/Cr polyimide system. The work expenditure during the peel test was estimated using the stress–strain curves of metal films, X-ray measurements of the plastic strain in peeled films, and the elastoplastic beam analysis. Results indicate that the peel strength is strongly affected by the film thickness and the pretreatment condition in a synergistic way, and that the peel strength shows a maximum at an intermediate thickness level. The estimated work expenditure was close to measured peel strength for most of the cases, which indicates that the measured peel strength is more a measure of the plastic deformation during the peel test than a measure of the true interfacial fracture energy.
Natalia Desy Putriningtyas - One of the best experts on this subject based on the ideXlab platform.
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Antibacterial potential of red dragon fruit peel yogurt (hylocereus spp.) against bacillus subtilis bacteria in hypercholesterolemic wistar rats
'Institute of Research and Community Services Diponegoro University (LPPM UNDIP)', 2021Co-Authors: Natalia Desy Putriningtyas, Mardiana Mardiana, Widya Hary CahyatiAbstract:Background: Fruit peel is a part of red dragon fruit that weighed 30-35% of the fruit weight and has not been used optimally. Red dragon fruit peel contains fiber, vitamin, flavonoid, tannin, alkaloids and has the potential as an antibacterial. Red dragon fruit peel can be processed into yogurt. Objectives: This research examined the antibacterial potential of red dragon fruit peel yogurt against Bacillus subtilis in hypercholesterolemic Wistar rats. Materials and Methods: Materials tested in this study were negative control, positive control, and caecum of hypercholesterolemic Wistar. This study used chloramphenicol as the positive control (K+) and DMSO 10% as the negative control (K-). The K1; K2; K3 were orally administered with 1.8 mL; 2.7 mL; 3.6 mL of red dragon fruit peel yogurt, respectively. Red dragon fruit peel yogurt was administered daily for 28 days. Caecum was collected and tested for antibacterial activity using disk diffusion (Kirby Bauer). The Bacillus subtilis was obtained from the Microbiology Laboratory of Center for Food and Nutrition Studies Universitas Gadjah Mada. Results: The average inhibition zone in K-; K+; K1; K2; K3 were 0.00±0.00 mm; 11.5±1.41 mm; 11.5±0.96 mm; 10.13±0.66 mm; 10.38±1.12 mm, respectively. The experimental animal groups, which received 2.7 mL and 1.8 mL of red dragon fruit peel yogurts, showed a significant difference compared to the positive control group (p= 0.026 and p=0.021, respectively). When the dose was increased to 3.6 mL, it showed no statistical difference in results (p=1.000). Conclusions: Red dragon fruit peel yogurt has an antibacterial potential against Bacillus subtilis
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red dragon fruit hylocereus spp peel marmalade effectively improve blood glucose and lipid profile of hypercholesterolemic wistar rats
Jurnal Gizi Indonesia (The Indonesian Journal of Nutrition), 2020Co-Authors: Natalia Desy Putriningtyas, Intan Permatasari, Dita Oktaviani, Anastasia Servia Raha, Siti WahyuningsihAbstract:Background: Polyphenols, antioxidants, dietary fiber, and vitamin contained in the red dragon fruit peel. Red dragon fruit peel can be processed into marmalade. Red dragon fruit peel marmalade has the potential to be a functional food. Functional food is food that has a physiological function based on scientific studies. Objectives: The objective of this study is to analyze the effect of red dragon fruit peel marmalade on fasting blood glucose levels, HDL, LDL, and triglycerides levels of hypercholesterolemic Wistar rats. Methods : This study used a pre-p K+; K1 (0.94 g/kg b.wt/day); K2 (1.41 g/kg b.wt/day); K3 (1.88 g/kg b.wt/day). The intervention was carried out for 28 days. GDP level was measured using the GOD-PAP. HDL, LDL, and triglyceride were analyzed with spectrophotometry. GDP, HDL, LDL, and triglyceride levels were measured twice before fasting. A paired t-test and one-way ANOVA were used to analyze the data. Results : The result showed that K-; K1; K2; K3 had a significant difference between groups before and after the intervention (p<0.05). Red dragon fruit peel Marmalade was able to reduce the levels of GDP, LDL, triglycerides, and increase HDL (p <0.05). Conclusion : Red dragon fruit peel marmalade reduced fasting blood glucose levels, LDL, triglyceride levels, and increased HDL levels of hypercholesterolemic Wistar rats.
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Red dragon fruit (Hylocereus spp.) peel marmalade effectively improve blood glucose and lipid profile of hypercholesterolemic wistar rats
'Institute of Research and Community Services Diponegoro University (LPPM UNDIP)', 2020Co-Authors: Natalia Desy Putriningtyas, Intan Permatasari, Dita Oktaviani, Anastasia Servia Raha, Siti WahyuningsihAbstract:Background: Polyphenols, antioxidants, dietary fiber, and vitamin contained in the red dragon fruit peel. Red dragon fruit peel can be processed into marmalade. Red dragon fruit peel marmalade has the potential to be a functional food. Functional food is food that has a physiological function based on scientific studies. Objectives: The objective of this study is to analyze the effect of red dragon fruit peel marmalade on fasting blood glucose levels, HDL, LDL, and triglycerides levels of hypercholesterolemic Wistar rats. Methods: This study used a pre-&post-test control group design. Hypercholesterolemic male Wistar rats were randomly assigned into five groups. Hypercholesterolemia was induced by 1% cholesterol powder and 0.5% cholic acid for two weeks. All groups received standard chow. Samples were grouped into five groups: K-; K+; K1 (0.94 g/kg b.wt/day); K2 (1.41 g/kg b.wt/day); K3 (1.88 g/kg b.wt/day). The intervention was carried out for 28 days. GDP level was measured using the GOD-PAP. HDL, LDL, and triglyceride were analyzed with spectrophotometry. GDP, HDL, LDL, and triglyceride levels were measured twice before fasting. A paired t-test and one-way ANOVA were used to analyze the data. Results: The result showed that K-; K1; K2; K3 had a significant difference between groups before and after the intervention (p
Siti Wahyuningsih - One of the best experts on this subject based on the ideXlab platform.
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red dragon fruit hylocereus spp peel marmalade effectively improve blood glucose and lipid profile of hypercholesterolemic wistar rats
Jurnal Gizi Indonesia (The Indonesian Journal of Nutrition), 2020Co-Authors: Natalia Desy Putriningtyas, Intan Permatasari, Dita Oktaviani, Anastasia Servia Raha, Siti WahyuningsihAbstract:Background: Polyphenols, antioxidants, dietary fiber, and vitamin contained in the red dragon fruit peel. Red dragon fruit peel can be processed into marmalade. Red dragon fruit peel marmalade has the potential to be a functional food. Functional food is food that has a physiological function based on scientific studies. Objectives: The objective of this study is to analyze the effect of red dragon fruit peel marmalade on fasting blood glucose levels, HDL, LDL, and triglycerides levels of hypercholesterolemic Wistar rats. Methods : This study used a pre-p K+; K1 (0.94 g/kg b.wt/day); K2 (1.41 g/kg b.wt/day); K3 (1.88 g/kg b.wt/day). The intervention was carried out for 28 days. GDP level was measured using the GOD-PAP. HDL, LDL, and triglyceride were analyzed with spectrophotometry. GDP, HDL, LDL, and triglyceride levels were measured twice before fasting. A paired t-test and one-way ANOVA were used to analyze the data. Results : The result showed that K-; K1; K2; K3 had a significant difference between groups before and after the intervention (p<0.05). Red dragon fruit peel Marmalade was able to reduce the levels of GDP, LDL, triglycerides, and increase HDL (p <0.05). Conclusion : Red dragon fruit peel marmalade reduced fasting blood glucose levels, LDL, triglyceride levels, and increased HDL levels of hypercholesterolemic Wistar rats.
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Red dragon fruit (Hylocereus spp.) peel marmalade effectively improve blood glucose and lipid profile of hypercholesterolemic wistar rats
'Institute of Research and Community Services Diponegoro University (LPPM UNDIP)', 2020Co-Authors: Natalia Desy Putriningtyas, Intan Permatasari, Dita Oktaviani, Anastasia Servia Raha, Siti WahyuningsihAbstract:Background: Polyphenols, antioxidants, dietary fiber, and vitamin contained in the red dragon fruit peel. Red dragon fruit peel can be processed into marmalade. Red dragon fruit peel marmalade has the potential to be a functional food. Functional food is food that has a physiological function based on scientific studies. Objectives: The objective of this study is to analyze the effect of red dragon fruit peel marmalade on fasting blood glucose levels, HDL, LDL, and triglycerides levels of hypercholesterolemic Wistar rats. Methods: This study used a pre-&post-test control group design. Hypercholesterolemic male Wistar rats were randomly assigned into five groups. Hypercholesterolemia was induced by 1% cholesterol powder and 0.5% cholic acid for two weeks. All groups received standard chow. Samples were grouped into five groups: K-; K+; K1 (0.94 g/kg b.wt/day); K2 (1.41 g/kg b.wt/day); K3 (1.88 g/kg b.wt/day). The intervention was carried out for 28 days. GDP level was measured using the GOD-PAP. HDL, LDL, and triglyceride were analyzed with spectrophotometry. GDP, HDL, LDL, and triglyceride levels were measured twice before fasting. A paired t-test and one-way ANOVA were used to analyze the data. Results: The result showed that K-; K1; K2; K3 had a significant difference between groups before and after the intervention (p
Munusamy Thirumavalavan - One of the best experts on this subject based on the ideXlab platform.
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fourier transform infrared spectroscopic analysis of fruit peels before and after the adsorption of heavy metal ions from aqueous solution
Journal of Chemical & Engineering Data, 2011Co-Authors: Munusamy Thirumavalavan, Yiling Lai, Jiunnfwu LeeAbstract:For orange peel (OP), lemon peel (LP), and banana peel (BP) as adsorbents for removal of heavy metal ions such as Cu2+, Ni2+, Cd2+, Pb2+, and Zn2+ from aqueous solution, a simple FT-IR technique was used and discussed to study the variation in functional groups upon modification. Metal−carbon bond formation was witnessed by FT-IR during metal ion adsorption. All of these adsorbents were characterized by FT-IR, BET, and SEM. The presence of carboxylic and hydroxyl groups was confirmed by FT-IR. The FT-IR spectrum of lemon peel cellulose (LPC) showed well resolved peaks for carboxylic acid and hydroxyl groups compared to LP indicating the appreciable contents of carboxylic acid and hydroxyl groups in LPC. The widely used Langmuir adsorption isotherms were used to describe the adsorption equilibrium process. The adsorption capacity of the metal ions such as Cu2+ and Ni2+ was found to be more than those of other metal ions. Upon comparison of the adsorbents, surface modified LPC (LPCACS) was found to show enh...
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effective adsorption of heavy metal ions cu2 pb2 zn2 from aqueous solution by immobilization of adsorbents on ca alginate beads
Toxicological & Environmental Chemistry, 2010Co-Authors: Yiling Lai, Munusamy Thirumavalavan, Jiunnfwu LeeAbstract:The performance of adsorbent system consisting of orange peel cellulose (OPC), banana peel cellulose (BPC), orange peel cellulose immobilized Ca-alginate beads (OPCCA) and banana peel cellulose immobilized Ca-alginate beads (BPCCA) for the removal of Cu2+, Pb2+, and Zn2+ from an aqueous solution was tested. The widely used Langmuir isotherm model was utilized to describe the adsorption equilibrium process. OPC and BPC were characterized by SEM and Fourier transform infrared spectroscopy (FT–IR) techniques. The concentration of metal ions was varied in order to obtain optimum concentration level. The effect of pH was studied at different pH values. The role of cellulose in the case of OPC and BPC and the role of alginate in OPCCA and BPCCA were well understood leading to two different mechanisms in native and immobilized cellulose. OPC was found to be a better adsorbent among OPC and BPC, and Cu2+ was considered to be adsorbed more effectively than Pb2+ and Zn2+. The extent of enhancement of adsorption cap...
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cellulose based native and surface modified fruit peels for the adsorption of heavy metal ions from aqueous solution langmuir adsorption isotherms
Journal of Chemical & Engineering Data, 2010Co-Authors: Munusamy Thirumavalavan, Yiling Lai, Lingchu Lin, Jiunnfwu LeeAbstract:A viable and cost-effective technology was explored in this present task for removal of heavy metal ions such as Cu2+, Ni2+, Zn2+, Cd2+, and Pb2+ from aqueous solution using three fruit peels such as orange peel (OP), lemon peel (LP), and banana peel (BP). The surface of the LP and lemon peel cellulose (LPC) was chemically modified. All these adsorbents were characterized by FT-IR, BET, and SEM. The widely used Langmuir adsorption isotherms were used to describe the adsorption equilibrium process. The adsorption capacity of metal ions such as Cu2+ and Ni2+ was found to be more than that of other metal ions. Upon comparison of the adsorbents, surface modified LPC (LPCACS) was found to show enhanced adsorption activity. A comparative study of adsorption was carried out with activated carbon (AC) also from which it was inferred that the order of the adsorption capacity is as follows: LPCACS > LPC > AC > LP.
