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- 저자 : Long Shuang Huang (검색결과 9 건)
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The mechanism of enhanced photocatalytic activity of SnO2 through fullerene modification
Shuang-Shuang Ding,Wei-Qing Huang,Bing-Xin Zhou,Ping Peng,Wangyu Hu,Meng-Qiu Long,Gui-Fang Huang 한국물리학회 2017 Current Applied Physics Vol.17 No.11
Carbon nanomaterials are prominent building blocks in the synthetic van der Waals (vdW) heterostructures with desired properties. Scientific understanding of their interfacial interactions is the premise to design this kind of vdW heterostructures with optimal performance.We here study the mechanism of enhanced photocatalytic activity of SnO2 by fullerene modification at electronic level, to explore the interfacial interaction and its correlation with photocatalytic activity. The results show that the interfacial interaction increases with the number of C atom of fullerene, and leads to some of C atoms be positively/ negatively charged, making the fullerene a highly active co-catalyst in heterostructures. Compared to pristine SnO2, the band gap of the heterostructures is much smaller, leading to their absorption wavelength extending the entire visible region. Interestingly, a staggered type-II band alignment in the C20 (C60)/SnO2 (101) heterostructures results into the robust separation of photoexcited charge carriers between the two constituents, indicating that the fullerene is an effective sensitizer, and thus enhanced photocatalytic activity. These findings can rationalize the available experiment and will be of broad interest in developing the highly efficient semiconductor photocatalysts via fullerene modification.
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Huang, Long Shuang,Kim, Mee Ree,Sok, Dai-Eun WILEY-VCH Verlag 2009 European journal of lipid science and technology Vol.111 No.6
<P>Some lipid peroxides are known to be converted to their corresponding alcohols in cells containing glutathione peroxidase (GPx). In this respect, we examined the enzymatic conversion of lysophosphatidylcholine (lysoPC) hydroperoxides to hydroxyl derivatives using RBL-2H3 cells and erythrocyte GPx-1. First, the incubation of RBL-2H3 cells with arachidonoyl lysoPC led to the formation of a major product, with maximal UV absorbance at 234 nm and m/z [M+H]<SUP>+</SUP> at 560.2, corresponding to monohydroxyeicosatetraenoyl lysoPC. Similarly, linoleoyl lysoPC was also converted to its hydroxyl derivative in RBL-2H3 cells. Separately, lysoPC hydroperoxide, generated from soybean lipoxygenase 1-catalyzed oxygenation of linoleoyl lysoPC, arachidonoyl lysoPC or docosahexaenoyl lysoPC, was converted by GPx-1 to the corresponding hydroxyl derivatives. When the kinetic values were determined, the K<SUB>m</SUB> values (3.1–32.3 µM) of the polyunsaturated lysoPC hydroperoxides increased with decreasing number of double bonds, in contrast to a similar value of V<SUB>m</SUB> among them. Moreover, the catalytic efficiency of docosahexaenoyl lysoPC hydroperoxide was much greater than that of H<SUB>2</SUB>O<SUB>2</SUB> as substrate of GPx-1. In related experiments, where phosphatidylcholine hydroperoxides were incubated with phospholipase A<SUB>2</SUB> and GPx-1, the complete conversion of phosphatidylcholine hydroperoxides to hydroxyl derivatives was confirmed by LC/MS. Taken together, it is proposed that GPx-1-type enzymes may participate in the conversion of polyunsaturated lysoPC hydroperoxides to hydroxyl derivatives in cell systems.</P>
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Biological Actions of Polyunsaturated Fatty Acyl Lysophospholipids
Long Shuang Huang,Sok, Dai-Eun 충남대학교 약학대학 의약품개발연구소 2009 藥學論文集 Vol.24 No.-
Lysophosphatidylcholine (lysoPC) and polyunsaturated fatty acids are known to be generated from the hydrolysis of phosphatidylcholine by enzymes such as secretary phospholipase A₂, lipoprotein-specific phospholipase A₂, lecithin/cholesterol acyl transferase or endothelial lipase. Free polyunsatuarted fatty acids have been known to be oxygenated by lipoxygenases to produce various bioactive compounds, which are known to exert antioxidant and anti-inflammatory actions. Meanwhile, lysoPC and its hydrolysis product, lysophosphatidic acid (lysoPA), are known to express a variety of bioactivities. However, most of the studies on the bioactivities of lysoPC and lysoPA were examined using lysophospholipids with saturated fatty acyl chains. Recently, the activities of unsaturated lysophospholipids have been of increasing interest, since unsaturated lysophospholipids, present to a substantial level in vivo, have been reported to be utilized as substrates for enzymes such as lipoxygenase. In this review, the biological activities of lysophospholipids, saturated or unsaturated, were discussed in an attempt to stress on the peculiar activities of polyunsaturated lysophospholipids such as 1-linoleoyl lysoPC and 1-docosahexaenoyl lysoPC.
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Phytate Determination in Various Cultivars of Korean Rice
Long Shuang Huang,Dai-Eun Sok,Hyoung Chin Kim,Won Kee Yoon,Hwan Mook Kim,Mee Ree Kim 한국식품영양과학회 2006 Preventive Nutrition and Food Science Vol.11 No.1
To determine the amount of phytate in rice grains from various cultivars, two methods were employed and compared in respect of the accuracy and conveniency. Phytate in rice samples was extracted with HCl, and then the extracts were subjected to an anion-exchange column. Finally, the phytate in eluate was quantitated using two methods: one method is based on the complex formation between ferric ion and sulfosalicylic acid in the presence of phytate, and the other is the prior acid digestion of phytate sample, followed by the colorimetric determination of liberated phosphorus. Although two methods showed similar values of phytate in rice samples, the former method is simpler and more precise than the latter. Moreover, the former is more reliable for the samples with lower phytate levels. Especially, the dilution condition of rice sample before anion exchange column separation was important for the recovery of phytate in rice samples. Based on the former method, the amount of phytate in rice of various cultivars was estimated to range from 7.3 ㎎/g to 12.4 ㎎/g rice. This method would be useful for the determination of phytate in crop samples with a lower level of phytate, one of anti-nutrients in some agricultural plants.
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Phytate Determination in Various Cultivars of Korean Rice
Huang, Long Shuang,Sok, Dai-Eun,Kim, Hyoung-Chin,Yoon, Won-Kee,Kim, Hwan-Mook,Kim, Mee-Ree The Korean Society of Food Science and Nutrition 2006 Preventive Nutrition and Food Science Vol.11 No.1
To determine the amount of phytate in rice grains from various cultivars, two methods were employed and compared in respect of the accuracy and conveniency. Phytate in rice samples was extracted with HCl, and then the extracts were subjected to an anion-exchange column. Finally, the phytate in eluate was quantitated using two methods: one method is based on the complex formation between ferric ion and sulfosalicylic acid in the presence of phytate, and the other is the prior acid digestion of phytate sample, followed by the colorimetric determination of liberated phosphorus. Although two methods showed similar values of phytate in rice samples, the former method is simpler and more precise than the latter. Moreover, the former is more reliable for the samples with lower phytate levels. Especially, the dilution condition of rice sample before anion exchange column separation was important for the recovery of phytate in rice samples. Based on the former method, the amount of phytate in rice of various cultivars was estimated to range from 7.3 mg/g to 12.4 mg/g rice. This method would be useful for the determination of phytate in crop samples with a lower level of phytate, one of anti-nutrients in some agricultural plants.
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Phytate Determination in Various Cultivars of Korean Rice
Mee Ree Kim,Long Shuang Huang,석대은,Hyoung Chin Kim,Won Kee Yoon,Hwan Mook Kim 한국식품영양과학회 2006 Preventive Nutrition and Food Science Vol.11 No.2
To determine the amount of phytate in rice grains from various cultivars, two methods were employed and compared in respect of the accuracy and conveniency. Phytate in rice samples was extracted with HCl, and then the extracts were subjected to an anion-exchange column. Finally, the phytate in eluate was quantitated using two methods: one method is based on the complex formation between ferric ion and sulfosalicylic acid in the presence of phytate, and the other is the prior acid digestion of phytate sample, followed by the colorimetric determination of liberated phosphorus. Although two methods showed similar values of phytate in rice samples, the former method is simpler and more precise than the latter. Moreover, the former is more reliable for the samples with lower phytate levels. Especially, the dilution condition of rice sample before anion exchange column separation was important for the recovery of phytate in rice samples. Based on the former method, the amount of phytate in rice of various cultivars was estimated to range from 7.3 mg/g to 12.4 mg/g rice. This method would be useful for the determination of phytate in crop samples with a lower level of phytate, one of anti-nutrients in some agricultural plants. .
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Man Zhang,Su‑Su Li,Qiao‑Mei Xie,Jian‑Hua Xu,Xiu‑Xiu Sun,Fa‑Ming Pan,Sheng‑Qian Xu,Sheng‑Xiu Liu,Jin‑Hui Tao,Shuang Liu,Jing Cai,Pei‑Ling Chen,Long Qian,Chun‑Huai Wang,Chun‑Mei Liang,Hai‑Liang Huang,Ha 한국유전학회 2018 Genes & Genomics Vol.40 No.10
Although the current glucocorticoids (GCs) treatment for systemic lupus erythematosus (SLE) is effective to a certain extent, the difference in therapeutic effect between patients is still a widespread problem. Some patients can have repeated attacks that greatly diminish their quality of life. This study was conducted to investigate the relationship between HSP90AA2 polymorphisms and disease susceptibility, GCs efficacy and health-related quality of life (HRQoL) in Chinese SLE patients. A case–control study was performed in 470 SLE patients and 470 normal controls. Then, 444 patients in the case group were followed up for 12 weeks to observe efficacy of GCs and improvement of HRQoL. Two single nucleotide polymorphisms (SNPs) of HSP90AA2 were selected for genotyping: rs1826330 and rs6484340. HRQoL was assessed using the SF-36 questionnaire. The minor T allele of rs1826330 and the TT haplotype formed by rs1826330 and rs6484340 showed associations with decreased SLE risk (T allele: PBH = 0.022; TT haplotype: PBH = 0.033). A significant association between rs6484340 and improvement of HRQoL was revealed in the follow-up study. Five subscales of SF-36 were appeared to be influenced by rs6484340: total score of SF-36 (additive model: PBH = 0.026), physical function (additive model: PBH = 0.026), rolephysical (recessive model: PBH = 0.041), mental health (dominant model: PBH = 0.047), and physical component summary (additive model: PBH = 0.026). No statistical significance was found between HSP90AA2 gene polymorphisms and GCs efficacy. These results revealed a genetic association between HSP90AA2 and SLE. Remarkably, HSP90AA2 has an impact on the improvement of HRQoL in Chinese population with SLE.
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