Oxidative reactions are key part of the stress response in marine organisms, which are exposed to a wide variety of environmental stressors. Lipid peroxidation (LPO) occurs in response to oxidant attack, giving rise t...Oxidative reactions are key part of the stress response in marine organisms, which are exposed to a wide variety of environmental stressors. Lipid peroxidation (LPO) occurs in response to oxidant attack, giving rise to unsaturated aldehydes as malondialdehyde (MDA), the main biomarker for LPO assessment. Levels of MDA are measured in biological samples of different fish matrices to determine the oxidative effect of physical or chemical agents, particularly represented by metals. The most used assay is the spectrophotometric determination of thiobarbituric acid (TBA) as MDA-TBA2 adduct. Selectivity is enhanced by separating the adduct by chromatographic methods such as high-performance liquid chromatography or by using alternative derivatization reagents. Because, in biological organism, MDA is found free or protein bound, the two forms should be measured, and the extraction procedures are a crucial step in the processing of the biological sample. This review focused on MDA determination procedures used to assess the effect of experimental and environmental stress induced in fish.展开更多
The paper was to explore the effect of rice blast resistance induced by Ag-antibiotic 702 on antioxidant enzyme activities and malondialdehyde（ MDA）content. At three-leaf and one-heart stage of Luliangyou 996,15 μg...The paper was to explore the effect of rice blast resistance induced by Ag-antibiotic 702 on antioxidant enzyme activities and malondialdehyde（ MDA）content. At three-leaf and one-heart stage of Luliangyou 996,15 μg/mL Ag-antibiotic 702 was sprayed,while Validamycin and distilled water were sprayed as positive control and negative control,respectively. The antioxidant enzyme（ SOD,POD,PPO,CAT and PAL） activities and malondialdehyde（ MDA） content in rice leaves were determined every 24 h within 168 h post spraying. Compared with CK,the MDA content and activities of the five antioxidant enzymes increased in Agantibiotic 702 treatment,Validamycin treatment and M. grisea inoculation treatment. The MDA content and SOD,CAT and POD activities in Ag-antibiotic 702 treatment were significantly higher than those in M. grisea inoculation treatment in early stage,and the APX and LOX activities increased more remarkably and rapidly. The induction effect of Ag-antibiotic 702 could reach or exceed that of Validamycin treatment. Ag-antibiotic 702 enhanced the resistance to rice blast because MDA content and antioxidant enzymes activities were improved in rice leaves. Therefore,the increase of rice blast resistance induced by Ag-antibiotic 702 in rice was positively correlated with the increase of MDA content and antioxidant enzymes activities in rice leaves.展开更多
Background and objectives: Diabetes is a chronic multifactorial disease which requires a variety of strategies to reduce its epidemic. Type 2 diabetes (T2MD) is the most common form of diabetes which results from inef...Background and objectives: Diabetes is a chronic multifactorial disease which requires a variety of strategies to reduce its epidemic. Type 2 diabetes (T2MD) is the most common form of diabetes which results from inefficiency of insulin secretion or resistance to insulin action, both of which lead to chronic hyperglycemia. Lipid peroxidation is an oxidative stress process that involve in T2DM complications. This study aimed to 1) determine plasma malondialdehyde (MDA) levels as a biomarker for lipid peroxidation in Sudanese patients with T2DM, and 2) assess the associations between MDA and diabetes-related variables. Material and Methods: This case-control study was conducted from November 2022 to June 2023 at the National University, Sudan. It included 100 participants, of whom 50 were T2DM patients and 50 were healthy controls. Data on demographics, clinical characteristics, and biochemical markers (FBS, HbA1c, and MDA) were collected. The NycoCard HbA1c method and the GOD-POD Method were used for HbA1c and glucose measurement, respectively. MDA was determined by the thiobarbituric acid reactive substances method. The data were analyzed using SPSS Version. Results: Significant differences were observed between T2DM patients and healthy controls in FBS (P = 0.000), HbA1c (P = 0.000), and MDA (P = 0.010), with T2DM patients exhibiting higher levels. The study revealed a strong positive correlation between MDA levels and the duration of diabetes (r = 0.69, P = 0.00), while other variables, including age, BMI, and glucose control, did not significantly correlate with MDA levels. Conclusion: Findings revealed elevated MDA levels in Sudanese T2DM patients, with a positive correlation between MDA and diabetes duration. These findings emphasize the importance of oxidative stress in T2DM pathogenesis and call for the need for targeted strategies to mitigate oxidative damage and improve diabetes care.展开更多
目的:探讨氨甲环酸联合超分子水杨酸换肤治疗黄褐斑临床疗效及对血清丙二醛(MDA),雌二醇(E2)水平的影响。方法:将2019年12月-2021年12月合肥市第二人民医院皮肤科经治的116例黄褐斑患者随机分为对照组(58例,口服氨甲环酸片)和观察组(58...目的:探讨氨甲环酸联合超分子水杨酸换肤治疗黄褐斑临床疗效及对血清丙二醛(MDA),雌二醇(E2)水平的影响。方法:将2019年12月-2021年12月合肥市第二人民医院皮肤科经治的116例黄褐斑患者随机分为对照组(58例,口服氨甲环酸片)和观察组(58例,口服氨甲环酸片联合30%超分子水杨酸治疗),两组患者均治疗20周。比较两组患者临床疗效[医生整体评价(Physician's global assessment,PGA)、黄褐斑面积和严重指数(Melasma area and severity index,MASI)、皮损评分、经表皮水分流失及皮肤角质层含水量]、主观指标(满意度、睡眠及精神状态)及血清MDA、E2水平。结果:观察组有效率93.10%高于对照组63.79%(P<0.05);两组治疗后MASI、皮损评分、经表皮水分流失及血清MDA、E2水平均较治疗前下降,且观察组改善优于对照组(P<0.05);两组治疗后角质层含水量均升高,且观察组升高更显著(P<0.05)。观察组PGA评分低于对照组(P<0.05)。观察组治疗后治疗满意度评分、睡眠评分、精神状态评分显著高于对照组(P<0.05)。两组治疗期间均未出现不良反应。结论:氨甲环酸联合超分子水杨酸换肤治疗黄褐斑效果显著,并可改善患者氧化应激反应及雌激素水平。展开更多
文摘Oxidative reactions are key part of the stress response in marine organisms, which are exposed to a wide variety of environmental stressors. Lipid peroxidation (LPO) occurs in response to oxidant attack, giving rise to unsaturated aldehydes as malondialdehyde (MDA), the main biomarker for LPO assessment. Levels of MDA are measured in biological samples of different fish matrices to determine the oxidative effect of physical or chemical agents, particularly represented by metals. The most used assay is the spectrophotometric determination of thiobarbituric acid (TBA) as MDA-TBA2 adduct. Selectivity is enhanced by separating the adduct by chromatographic methods such as high-performance liquid chromatography or by using alternative derivatization reagents. Because, in biological organism, MDA is found free or protein bound, the two forms should be measured, and the extraction procedures are a crucial step in the processing of the biological sample. This review focused on MDA determination procedures used to assess the effect of experimental and environmental stress induced in fish.
基金Supported by National Natural Science Foundation of China(31360450)
文摘The paper was to explore the effect of rice blast resistance induced by Ag-antibiotic 702 on antioxidant enzyme activities and malondialdehyde（ MDA）content. At three-leaf and one-heart stage of Luliangyou 996,15 μg/mL Ag-antibiotic 702 was sprayed,while Validamycin and distilled water were sprayed as positive control and negative control,respectively. The antioxidant enzyme（ SOD,POD,PPO,CAT and PAL） activities and malondialdehyde（ MDA） content in rice leaves were determined every 24 h within 168 h post spraying. Compared with CK,the MDA content and activities of the five antioxidant enzymes increased in Agantibiotic 702 treatment,Validamycin treatment and M. grisea inoculation treatment. The MDA content and SOD,CAT and POD activities in Ag-antibiotic 702 treatment were significantly higher than those in M. grisea inoculation treatment in early stage,and the APX and LOX activities increased more remarkably and rapidly. The induction effect of Ag-antibiotic 702 could reach or exceed that of Validamycin treatment. Ag-antibiotic 702 enhanced the resistance to rice blast because MDA content and antioxidant enzymes activities were improved in rice leaves. Therefore,the increase of rice blast resistance induced by Ag-antibiotic 702 in rice was positively correlated with the increase of MDA content and antioxidant enzymes activities in rice leaves.
文摘Background and objectives: Diabetes is a chronic multifactorial disease which requires a variety of strategies to reduce its epidemic. Type 2 diabetes (T2MD) is the most common form of diabetes which results from inefficiency of insulin secretion or resistance to insulin action, both of which lead to chronic hyperglycemia. Lipid peroxidation is an oxidative stress process that involve in T2DM complications. This study aimed to 1) determine plasma malondialdehyde (MDA) levels as a biomarker for lipid peroxidation in Sudanese patients with T2DM, and 2) assess the associations between MDA and diabetes-related variables. Material and Methods: This case-control study was conducted from November 2022 to June 2023 at the National University, Sudan. It included 100 participants, of whom 50 were T2DM patients and 50 were healthy controls. Data on demographics, clinical characteristics, and biochemical markers (FBS, HbA1c, and MDA) were collected. The NycoCard HbA1c method and the GOD-POD Method were used for HbA1c and glucose measurement, respectively. MDA was determined by the thiobarbituric acid reactive substances method. The data were analyzed using SPSS Version. Results: Significant differences were observed between T2DM patients and healthy controls in FBS (P = 0.000), HbA1c (P = 0.000), and MDA (P = 0.010), with T2DM patients exhibiting higher levels. The study revealed a strong positive correlation between MDA levels and the duration of diabetes (r = 0.69, P = 0.00), while other variables, including age, BMI, and glucose control, did not significantly correlate with MDA levels. Conclusion: Findings revealed elevated MDA levels in Sudanese T2DM patients, with a positive correlation between MDA and diabetes duration. These findings emphasize the importance of oxidative stress in T2DM pathogenesis and call for the need for targeted strategies to mitigate oxidative damage and improve diabetes care.
文摘目的:探讨氨甲环酸联合超分子水杨酸换肤治疗黄褐斑临床疗效及对血清丙二醛(MDA),雌二醇(E2)水平的影响。方法:将2019年12月-2021年12月合肥市第二人民医院皮肤科经治的116例黄褐斑患者随机分为对照组(58例,口服氨甲环酸片)和观察组(58例,口服氨甲环酸片联合30%超分子水杨酸治疗),两组患者均治疗20周。比较两组患者临床疗效[医生整体评价(Physician's global assessment,PGA)、黄褐斑面积和严重指数(Melasma area and severity index,MASI)、皮损评分、经表皮水分流失及皮肤角质层含水量]、主观指标(满意度、睡眠及精神状态)及血清MDA、E2水平。结果:观察组有效率93.10%高于对照组63.79%(P<0.05);两组治疗后MASI、皮损评分、经表皮水分流失及血清MDA、E2水平均较治疗前下降,且观察组改善优于对照组(P<0.05);两组治疗后角质层含水量均升高,且观察组升高更显著(P<0.05)。观察组PGA评分低于对照组(P<0.05)。观察组治疗后治疗满意度评分、睡眠评分、精神状态评分显著高于对照组(P<0.05)。两组治疗期间均未出现不良反应。结论:氨甲环酸联合超分子水杨酸换肤治疗黄褐斑效果显著,并可改善患者氧化应激反应及雌激素水平。
