ABSTRACT
Based on computer-aided drug design (CADD), the active groups of the known active small molecule compounds that can bind to EGFR target protein were analyzed through the molecular docking method. Then, 12 novel asiatic acid derivatives were synthesized by introducing active groups at ring A and C-28 positions of asiatic acid. The structures of these novel compounds were determined by NMR and MS. Furthermore, the anti-tumor activities of these derivatives on human lung cancer cells (A549) and human breast cancer cells (MCF-7) were evaluated by MTT assay. In conclusion, compounds I4 and II3 have stronger anti-cancer activity than parent compounds, the activities were stronger than gefitinib and comparable to afatinib, which may be potential candidate compounds for tumor therapy.
Subject(s)
Antineoplastic Agents , Pentacyclic Triterpenes , Humans , Antineoplastic Agents/chemistry , Structure-Activity Relationship , Cell Line, Tumor , Molecular Docking Simulation , Cell Proliferation , Drug Design , Molecular Structure , Drug Screening Assays, AntitumorABSTRACT
Based on the simulated docking of Epidermal growth factor receptor inhibitors with known active small molecule compounds, computer-aided drug design technology was used to analyze key amino acid fragments and determine the active groups binding with key sites. Then, twelve novel analogues of oleanolic acid (OA) were synthesized by introducing active groups at the C-3 and C-28 positions of OA. The structures of these novel analogues were confirmed by NMR and MS. Furthermore, the antitumor activities of these novel analogues were evaluated by MTT assay. As a result, compounds I3 and II3 showed stronger cytotoxicity on tumor cells than positive controls. In conclusion, our study synthesized twelve novel analogues of OA and determined compounds I3 and II3 had better antitumor effect, which may be potential candidate compounds for tumor therapy.
Subject(s)
Antineoplastic Agents , Oleanolic Acid , ErbB Receptors/pharmacology , Antineoplastic Agents/chemistry , Cell Proliferation , Structure-Activity Relationship , Drug Screening Assays, AntitumorABSTRACT
To discovery novel VEGFR inhibitors, 12 novel asiatic acid derivatives were designed by computer-aided drug design (CADD) technology. Then, these novel asiatic acid derivatives were synthesized by introducing active groups at ring A and C-28 positions of asiatic acid. The structures of these novel analogues were confirmed by NMR and MS. Moreover, the anti-tumor activities of these novel asiatic acid derivatives on human hepatoma cells HepG2 and human gastric cancer cells SGC7901 were evaluated by MTT assay. As a result, compounds I2 and II4 showed stronger cytotoxicity on tumor cells than asiatic acid and positive control drugs such as gefitinib and paclitaxel. In conclusion, our study synthesized twelve novel asiatic acid derivatives and determined compounds I2 and II4 had better anti-tumor effect which may be potential candidate compounds for tumor therapy.
Subject(s)
Antineoplastic Agents , Humans , Antineoplastic Agents/chemistry , Molecular Structure , Structure-Activity Relationship , Cell Line, Tumor , Cell Proliferation , Drug Screening Assays, Antitumor , Molecular Docking SimulationABSTRACT
Liuweiwuling Tablet (LWWL) is a licensed Chinese patent medicine (approval number: Z20060238) included in the national health insurance for anti-inflammation of chronic HBV infection, whereas its anti-HBV effect remains clarification. The study aimed to clarify its antiviral effect and related mechanisms. HepG2.2.15 cells (wild-type HBV-replicating cells) and HepG2. A64 cells (entecavir-resistant HBV-replicating cells) were used for in vitro test. Hydrodynamic injection-mediated HBV-replicating mouse model was used for in vivo test. Active compounds and related mechanisms for antiviral effect of LWWL were analyzed using network pharmacology and transcriptomics. The inhibition rates of LWWL (0.8 mg/ml) on HBV DNA, HBsAg, and pgRNA were 57.06, 38.55, and 62.49% in HepG2.2.15 cells, and 51.57, 17.57, and 53.88% in HepG2. A64 cells, respectively. LWWL (2 g kg-1 d-1 for 4 weeks)-treated mice had 1.16 log10 IU/mL decrease of serum HBV DNA, and more than 50% decrease of serum HBsAg/HBeAg and hepatic HBsAg/HBcAg. Compared to tenofovir control, LWWL was less effective in suppressing HBV DNA but more effective in suppressing HBV antigens. Thirteen differentially-expressed genes were found in relation to HBV-host interaction and some of them were enriched in interferon (IFN)-ß pathway in LWWL-treated HepG2.2.15 cells. CD3+CD4+ T-cell frequency and serum IFN-γ were significantly increased in LWWL-treated mice compared to LWWL-untreated mice. Among 26 compounds with potential anti-HBV effects that were predicted by network pharmacology, four compounds (quercetin, luteolin, wogonin, and kaempferol) were experimentally confirmed to have antiviral potency. In conclusion, LWWL had potent inhibitory effect on both wild-type and entecavir-resistant HBV, which might be associated with increasing IFN-ß and IFN-γ production.
ABSTRACT
BACKGROUND: It is unclear whether immune escape-associated mutations in the major hydrophilic region of hepatitis B virus surface antigen (HBsAg) are associated with nucleoside/nucleotide analog resistance. AIM: To evaluate the association between immune escape-associated mutations and nucleoside/nucleotide analog resistance mutations. METHODS: In total, 19440 patients with chronic hepatitis B virus infection, who underwent resistance testing at the Fifth Medical Center of Chinese PLA General Hospital between July 2007 and December 2017, were enrolled. As determined by sequence analysis, 6982 patients harbored a virus with resistance mutations and 12458 harbored a virus lacking resistance mutations. Phenotypic analyses were performed to evaluate HBsAg production, replication capacity, and drug-induced viral inhibition of patient-derived drug-resistant mutants with or without the coexistence of sA159V. RESULTS: The rate of immune escape-associated mutation was significantly higher in 9 of the 39 analyzed mutation sites in patients with resistance mutations than in patients without resistance mutations. In particular, these mutations were sQ101H/K/R, sS114A/L/T, sT118A/K/M/R/S/V, sP120A/L/Q/S/T, sT/I126A/N/P/S, sM133I/L/T, sC137W/Y, sG145A/R, and sA159G/V. Among these, sA159V was detected in 1.95% (136/6982) of patients with resistance mutations and 1.08% (134/12,458) of patients lacking resistance mutations (P < 0.05). The coexistence of sA159V with lamivudine (LAM) and entecavir (ETV)-resistance mutations in the same viral genome was identified during follow-up in some patients with drug resistance. HBsAg production was significantly lower and the replication capacity was significantly higher, without a significant difference in LAM/ETV susceptibility, in sA159V-containing LAM/ETV-resistant mutants than in their sA159V-lacking counterparts. CONCLUSION: In summary, we observed a close link between the increase in certain immune escape-associated mutations and the development of resistance mutations. sA159V might increase the fitness of LAM/ETV-resistant mutants under environmental pressure in some cases.
Subject(s)
Antiviral Agents , Hepatitis B, Chronic , Antiviral Agents/therapeutic use , DNA, Viral/genetics , Drug Resistance, Viral/genetics , Hepatitis B virus/genetics , Hepatitis B, Chronic/diagnosis , Hepatitis B, Chronic/drug therapy , Humans , Lamivudine/therapeutic use , MutationABSTRACT
BACKGROUND: Non-invasive evaluation for liver fibrosis is clinically important, especially in patients with undetectable hepatitis B virus (HBV) DNA treated with nucleoside analogs. AIM: To clarify the monitoring power of hepatitis B core-related antigen (HBcrAg) for hepatic histologic changes in patients with chronic hepatitis B (CHB) treated with entecavir. METHODS: This prospective multicenter study used multiple ordinal and multivariate logistics regression analysis to assess variables associated with Ishak fibrosis score and regression for fibrosis regression, respectively, in 403 CHB patients, including 374 with entecavir for 72 weeks (291 underwent paired liver biopsy) and 29 as controls. RESULTS: Level of HBcrAg correlated negatively with liver fibrosis staging (γ = -0.357, P < 0.001) in hepatitis B e antigen (HBeAg)-positive patients, and positively with liver fibrosis staging in HBeAg-negative patients. Higher HBcrAg concentration was associated with younger age, HBeAg positive status, high HBV DNA loads, high level of hepatitis B surface antigen (HBsAg) and higher necroinflammation, but not with HBV genotype. Serum concentration of HBcrAg, basal core promoter/precore (BCP/PC) mutant, quantitation of HBsAg (qHBsAg) and platelet counts were independently associated with Ishak fibrosis score on multiple ordinal regression. HBV DNA was undetectable in 88.37% of patients treated with entecavir at week 72, while their level of HBcrAg was still detectable. A greater reduction in post-treatment HBcrAg concentration was associated with the regression of hepatic fibrosis and histological improvement. HBcrAg concentration > 6.33 log IU/mL at baseline and logarithmic reduction > 1.03 log IU/mL at week 72 were associated with a higher chance of regression of liver fibrosis and histological improvement, respectively. CONCLUSION: HBcrAg level is associated with liver fibrosis progression. HBcrAg is an excellent monitor of hepatic histological changes, especially in CHB patients treated with nucleoside analogs.
Subject(s)
Antiviral Agents/therapeutic use , Hepatitis B Core Antigens/blood , Hepatitis B virus/isolation & purification , Hepatitis B, Chronic/drug therapy , Liver Cirrhosis/diagnosis , Adult , Biomarkers/blood , DNA, Viral/blood , DNA, Viral/isolation & purification , Disease Progression , Female , Guanine/analogs & derivatives , Guanine/therapeutic use , Hepatitis B Core Antigens/immunology , Hepatitis B Core Antigens/isolation & purification , Hepatitis B virus/immunology , Hepatitis B, Chronic/blood , Hepatitis B, Chronic/pathology , Humans , Liver/pathology , Liver/virology , Liver Cirrhosis/blood , Liver Cirrhosis/pathology , Male , Middle Aged , Prospective Studies , Treatment OutcomeABSTRACT
The seed coat of red sword bean (Canavalia gladiata (Jacq.) DC.) is rich in antioxidant polyphenols. It is often discarded as a byproduct with the consumption of red sword bean, since it is very thick and not consumed by people. The aim of this study was to develop an ultrasound-assisted extraction method to extract natural antioxidants from the seed coats. The extraction process was optimized by using response surface methodology. After the single-factor experiments, three key factors, including ethanol concentration, liquid/solid ratio, and extraction time, were selected and their interactions were studied using a central composite design. The optimal extraction condition was 60.2% hydroethanol, a liquid/solid ratio of 29.3 mL/g, an extraction time of 18.4 min, an extraction temperature of 50 °C, and ultrasound power of 400 W. Under the optimal conditions, antioxidant activity of the extract was 755.98 ± 10.23 µmol Trolox/g dry weight (DW), much higher than that from maceration (558.77 ± 14.42 µmol Trolox/g DW) or Soxhlet extraction (479.81 ± 12.75 µmol Trolox/g DW). In addition, the main antioxidant compounds in the extract were identified and quantified by high-performance liquid chromatography-diode array detection-tandem mass spectrometry (HPLC-DAD-MS/MS). The concentrations of digalloyl hexoside, methyl gallate, gallic acid, trigalloyl hexoside, and digallic acid were 15.30 ± 0.98, 8.85 ± 0.51, 8.76 ± 0.36, 4.27 ± 0.21, and 2.89 ± 0.13 mg/g DW. This study provides an efficient and green extraction method for the extraction of natural antioxidants from the bean coat of red sword bean. The extract of antioxidants might be added into functional foods or nutraceuticals with potential beneficial functions.
ABSTRACT
The only Food and Drug Administration-approved treatment for acute ischemic stroke is tissue plasminogen activator, and the discovery of novel therapeutic targets is critical. Here, we found orosomucoid (ORM), an acute-phase protein mainly produced by the liver, might act as a treatment candidate for an ischemic stroke. The results showed that ORM2 is the dominant subtype in mice normal brain tissue. After middle cerebral artery occlusion (MCAO), the level of ORM2 is significantly increased in the ischemic penumbra compared with the contralateral normal brain tissue, whereas ORM1 knockout did not affect the infarct size. Exogenous ORM could significantly decrease infarct size and neurological deficit score. Inspiringly, the best administration time point was at 4.5 and 6 hr after MCAO. ORM could markedly decrease the Evans blue extravasation, and improve blood-brain barrier-associated proteins expression in the ischemic penumbra of MACO mice and oxygen-glucose deprivation (OGD)-treated bEnd3 cells. Meanwhile, ORM could significantly alleviate inflammation by inhibiting the production of interleukin 1ß (IL-1ß), IL-6, and tumor necrosis factor α (TNF-α), reduce oxidative stress by improving the balance of malondialdehyde (MDA) and superoxide dismutase (SOD), inhibit apoptosis by decreasing caspase-3 activity in ischemic penumbra of MCAO mice and OGD-treated bEnd.3 cells. Because of its protective role at multiple levels, ORM might be a promising therapeutic target for ischemic stroke.
Subject(s)
Brain Ischemia/metabolism , Orosomucoid/metabolism , Stroke/metabolism , Animals , Blood-Brain Barrier , Cell Line , Endothelial Cells , Glucose/administration & dosage , Infarction, Middle Cerebral Artery , Male , Mice , Mice, Inbred C57BL , Mice, Knockout , Orosomucoid/genetics , Oxidative Stress , Oxygen/administration & dosage , PermeabilityABSTRACT
The purpose of the present work was designed to explore protective cerebrovascular effects of hydroxysafflor yellow A (HSYA), and provide preclinical efficacy and mechanism data for its possible application in patients with cerebral ischemia. The protective effect of HSYA on ischemic stroke was evaluated by infarct sizes and neurological scores in Sprague-Dawley (SD) rats with middle cerebral artery occlusion (MCAO). Cerebrovascular permeability was detected by Evans blue dye leakage in MCAO rats. Cerebral blood flow, as well as blood pressure and heart rate were monitored using flow probes in Beagle dogs. Basilar artery tension isolated from Beagle dogs was evaluated with an MPA 2000 data-acquisition system. Coagulation-related function was also judged, including rabbit platelet aggregation by adenosine diphosphate (ADP) and platelet-aggregating factor (PAF), rabbit blood viscosity by a blood viscometer, and thrombus formation by rat arterial-venous shunts. Results showed that HSYA treatment significantly decreased the infarct sizes, neurological scores and cerebrovascular permeability in rats with MCAO. However, cerebral blood flow, blood pressure and heart rate were not affected by HSYA. In vitro, HSYA had a strong effect on cerebrovascular vasodilatation, and significantly decreased platelet aggregation, blood viscosity, and thrombogenesis. Besides well-known anti-coagulation effects, HSYA protects against ischemic stroke by dilating cerebral vessels and improving cerebrovascular permeability.
Subject(s)
Brain Ischemia/complications , Brain/blood supply , Chalcone/analogs & derivatives , Quinones/pharmacology , Stroke/prevention & control , Stroke/physiopathology , Animals , Basilar Artery/drug effects , Basilar Artery/physiopathology , Blood Pressure/drug effects , Blood Viscosity/drug effects , Brain/drug effects , Cerebrovascular Circulation/drug effects , Chalcone/pharmacology , Coronary Vessels/drug effects , Coronary Vessels/physiopathology , Dogs , Heart Rate/drug effects , Permeability/drug effects , Platelet Aggregation/drug effects , Rabbits , Rats , Stroke/complications , Stroke/metabolism , Thrombosis/prevention & control , Vasodilation/drug effectsABSTRACT
Chronic excessive alcohol consumption (more than 40-80 g/day for males and more than 20-40 g/day for females) could induce serious liver injury. In this study, effects of lemon juice on chronic alcohol-induced liver injury in mice were evaluated. The serum biochemical profiles and hepatic lipid peroxidation levels, triacylglycerol (TG) contents, antioxidant enzyme activities, and histopathological changes were examined for evaluating the hepatoprotective effects of lemon juice in mice. In addition, the in vitro antioxidant capacities of lemon juice were determined. The results showed that lemon juice significantly inhibited alcohol-induced increase of alanine transaminase (ALT), aspartate transaminase (AST), hepatic TG, and lipid peroxidation levels in a dose-dependent manner. Histopathological changes induced by alcohol were also remarkably improved by lemon juice treatment. These findings suggest that lemon juice has protective effects on alcohol-induced liver injury in mice. The protective effects might be related to the antioxidant capacity of lemon juice because lemon juice showed in vitro antioxidant capacity.
Subject(s)
Citrus , Fruit and Vegetable Juices , Liver Diseases, Alcoholic/diet therapy , Liver/metabolism , Alanine Transaminase/blood , Animals , Aspartate Aminotransferases/blood , Lipid Peroxidation/drug effects , Liver/injuries , Liver/pathology , Liver Diseases, Alcoholic/blood , Liver Diseases, Alcoholic/pathology , Male , Mice , Triglycerides/metabolismABSTRACT
Insomnia is a serious worldwide health threat, affecting nearly one third of the general population. Melatonin has been reported to improve sleep efficiency and it was found that eating melatonin-rich foods could assist sleep. During the last decades, melatonin has been widely identified and qualified in various foods from fungi to animals and plants. Eggs and fish are higher melatonin-containing food groups in animal foods, whereas in plant foods, nuts are with the highest content of melatonin. Some kinds of mushrooms, cereals and germinated legumes or seeds are also good dietary sources of melatonin. It has been proved that the melatonin concentration in human serum could significantly increase after the consumption of melatonin containing food. Furthermore, studies show that melatonin exhibits many bioactivities, such as antioxidant activity, anti-inflammatory characteristics, boosting immunity, anticancer activity, cardiovascular protection, anti-diabetic, anti-obese, neuroprotective and anti-aging activity. This review summaries the dietary sources and bioactivities of melatonin, with special attention paid to the mechanisms of action.
Subject(s)
Diet , Melatonin/blood , Melatonin/physiology , Biological Availability , Circadian Rhythm/physiology , Humans , Melatonin/pharmacokinetics , Nutrition Policy , Randomized Controlled Trials as Topic , Sleep Deprivation/bloodABSTRACT
Mung bean (Vigna radiata) sprout is commonly consumed as a vegetable, while the coat of the germinated mung bean is a waste. In this paper, an ultrasound-assisted extraction method has been developed to extract natural antioxidants from the seed coat of mung bean. Several experimental parameters-which included ethanol concentration, solvent/material ratio, ultrasound extraction time, temperature, and power-were studied in single-factor experiments. The interaction of three key experimental parameters (ethanol concentration, solvent/material ratio, and ultrasonic extraction time) was further investigated by response surface method. Besides, traditional extracting methods, including maceration and Soxhlet extraction methods, were also carried out for comparison. The results suggested that the best extracting condition was 37.6% (v/v) of ethanol concentration, 35.1:1 mL/g of solvent/material ratio and ultrasonic extraction of 46.1 min at 70 °C under 500 W ultrasonic irradiation. The antioxidant capacity (178.28 ± 7.39 µmol Trolox/g DW) was much stronger than those obtained by the maceration extraction process (158.66 ± 4.73 µmol Trolox/g DW) and the Soxhlet extraction process (138.42 ± 3.63 µmol Trolox/g DW). In addition, several antioxidant components in the extract were identified and quantified. This study is helpful for value-added utilization of the waste from germinated mung bean.
Subject(s)
Antioxidants/chemistry , Antioxidants/pharmacology , Chemical Fractionation , Plant Extracts/chemistry , Plant Extracts/pharmacology , Ultrasonic Waves , Vigna/chemistry , Antioxidants/isolation & purification , Chemical Fractionation/methods , Plant Extracts/isolation & purification , Polyphenols/chemistry , Solvents , Temperature , TimeABSTRACT
The epidemiological studies have indicated a possible oncostatic property of melatonin on different types of tumors. Besides, experimental studies have documented that melatonin could exert growth inhibition on some human tumor cells in vitro and in animal models. The underlying mechanisms include antioxidant activity, modulation of melatonin receptors MT1 and MT2, stimulation of apoptosis, regulation of pro-survival signaling and tumor metabolism, inhibition on angiogenesis, metastasis, and induction of epigenetic alteration. Melatonin could also be utilized as adjuvant of cancer therapies, through reinforcing the therapeutic effects and reducing the side effects of chemotherapies or radiation. Melatonin could be an excellent candidate for the prevention and treatment of several cancers, such as breast cancer, prostate cancer, gastric cancer and colorectal cancer. This review summarized the anticancer efficacy of melatonin, based on the results of epidemiological,experimental and clinical studies, and special attention was paid to the mechanisms of action.
Subject(s)
Melatonin/therapeutic use , Neoplasms/prevention & control , Animals , Humans , Neoplasms/metabolism , Receptors, Melatonin/metabolismABSTRACT
Many studies have indicated that consumption of vegetables and fruits are positively related to lower incidence of several chronic noncommunicable diseases. Although composition of fruit and vegetable juices is different from that of the edible portion of fruits and vegetables, they contain polyphenols and vitamins from fruits and vegetables. Drinking vegetable and fruit juices is very popular in many countries, and also an efficient way to improve consumption of fruits and vegetables. The studies showed that fruit and vegetable juices affect cardiovascular risk factors, such as lowering blood pressure and improving blood lipid profiles. The main mechanisms of action included antioxidant effects, improvement of the aspects of the cardiovascular system, inhibition of platelet aggregation, anti-inflammatory effects, and prevention of hyperhomocysteinemia. Drinking juices might be a potential way to improve cardiovascular health, especially mixtures of juices because they contain a variety of polyphenols, vitamins, and minerals from different fruits and vegetables. This review summarizes recent studies on the effects of fruit and vegetable juices on indicators of cardiovascular disease, and special attention is paid to the mechanisms of action.
Subject(s)
Cardiovascular Diseases/epidemiology , Cardiovascular Diseases/etiology , Fruit and Vegetable Juices , Anti-Inflammatory Agents, Non-Steroidal/administration & dosage , Anti-Inflammatory Agents, Non-Steroidal/chemistry , Antioxidants/administration & dosage , Antioxidants/chemistry , Biological Products/administration & dosage , Biological Products/adverse effects , Biomarkers , Blood Pressure/drug effects , Body Weight/drug effects , Cardiovascular Diseases/metabolism , Cardiovascular Diseases/physiopathology , Fruit and Vegetable Juices/analysis , Humans , Incidence , Lipids/blood , Platelet Aggregation/drug effectsABSTRACT
Liver injuries and diseases are serious health problems worldwide. Various factors, such as chemical pollutants, drugs, and alcohol, could induce liver injuries. Liver diseases involve a wide range of liver pathologies, including hepatic steatosis, fatty liver, hepatitis, fibrosis, cirrhosis, and hepatocarcinoma. Despite all the studies performed up to now, therapy choices for liver injuries and diseases are very few. Therefore, the search for a new treatment that could safely and effectively block or reverse liver injuries and diseases remains a priority. Melatonin is a well-known natural antioxidant, and has many bioactivities. There are numerous studies investigating the effects of melatonin on liver injuries and diseases, and melatonin could regulate various molecular pathways, such as inflammation, proliferation, apoptosis, metastasis, and autophagy in different pathophysiological situations. Melatonin could be used for preventing and treating liver injuries and diseases. Herein, we conduct a review summarizing the potential roles of melatonin in liver injuries and diseases, paying special attention to the mechanisms of action.
Subject(s)
Liver Diseases/drug therapy , Melatonin/pharmacology , Animals , Apoptosis , Autophagy , Humans , Liver/drug effects , Liver/metabolism , Liver Diseases/metabolism , Melatonin/therapeutic useABSTRACT
The fruit of Melastoma sanguineum Sims is an edible and sweet wild fruit. In our previous study, the fruit was found to have a strong antioxidant property. In this study, an ultrasound-assisted extraction (UAE) method was developed to extract natural antioxidants from the fruit of Melastoma sanguineum Sims, and a response surface methodology was used to optimize the conditions of UAE to maximize the extraction efficiency. The influence of five independent extraction parameters (ethanol concentration, solvent/material ratio, extracting time, temperature, and ultrasound power) on the extraction efficiency were investigated using a single factor experiment, and then a central composite rotatable design was used to investigate the interaction of three key parameters. The results showed that the optimal extraction conditions were 42.98% ethanol, 28.29 mL/g solvent/material ratio, 34.29 min extracting time, 60 °C temperature, and 600 W ultrasound power. Under these conditions, the Trolox equivalent antioxidant capacity (TEAC) value of the extracts was 1074.61 ± 32.56 µmol Trolox/g dry weight (DW). Compared with conventional maceration (723.27 ± 11.61 µmol Trolox/g DW) and Soxhlet extraction methods (518.37 ± 23.23 µmol Trolox/g DW), the UAE method improved the extraction efficiency, in a shorter period of time. In addition, epicatechin gallate, epicatechin, rutin, epigallocatechin, protocatechuic acid, chlorogenic acid, and quercetin, were identified and quantified in the fruit extracts of Melastoma sanguineum Sims by UPLC-MS/MS.
Subject(s)
Antioxidants/chemistry , Antioxidants/pharmacology , Chemical Fractionation , Fruit/chemistry , Melastomataceae/chemistry , Plant Extracts/chemistry , Plant Extracts/pharmacology , Ultrasonic Waves , Phenols , SolventsABSTRACT
Natural antioxidants are widely distributed in food and medicinal plants. These natural antioxidants, especially polyphenols and carotenoids, exhibit a wide range of biological effects, including anti-inflammatory, anti-aging, anti-atherosclerosis and anticancer. The effective extraction and proper assessment of antioxidants from food and medicinal plants are crucial to explore the potential antioxidant sources and promote the application in functional foods, pharmaceuticals and food additives. The present paper provides comprehensive information on the green extraction technologies of natural antioxidants, assessment of antioxidant activity at chemical and cellular based levels and their main resources from food and medicinal plants.
Subject(s)
Antioxidants/analysis , Antioxidants/isolation & purification , Biological Products/analysis , Biological Products/isolation & purification , Food , Plants, Medicinal/chemistry , Antioxidants/pharmacology , Biological Assay/methods , Biological Products/pharmacology , Carotenoids/analysis , Carotenoids/isolation & purification , Carotenoids/pharmacology , Free Radical Scavengers/analysis , Free Radical Scavengers/isolation & purification , Free Radical Scavengers/pharmacology , Oxidation-Reduction/drug effects , Polyphenols/analysis , Polyphenols/isolation & purification , Polyphenols/pharmacology , SolventsABSTRACT
Natural antioxidants are widely used as dietary supplements or food additives. An optimized method of ultrasound-assisted extraction (UAE) was proposed for the effective extraction of antioxidants from the flowers of Limonium sinuatum and evaluated by response surface methodology. In this study, ethanol concentration, ratio of solvent to solid, ultrasonication time and temperature were investigated and optimized using a central composite rotatable design. The optimum extraction conditions were as follows: ethanol concentration, 60%; ratio of solvent to solid, 56.9:1mL/g; ultrasonication time, 9.8min; and temperature, 40°C. Under the optimal UAE conditions, the experimental values (483.01±15.39µmolTrolox/gDW) matched with those predicted (494.13µmolTrolox/gDW) within a 95% confidence level. In addition, the antioxidant activities of UAE were compared with those of conventional maceration and Soxhlet extraction methods, and the ultrasound-assisted extraction could give higher yield of antioxidants and markedly reduce the extraction time.
Subject(s)
Antioxidants/analysis , Flowers/chemistry , Plumbaginaceae/chemistry , Ultrasonics , Ethanol/chemistry , Plant Extracts/analysis , Polyphenols/analysis , Reproducibility of Results , SolventsABSTRACT
The Thelephora ganbajun mushroom has been found to be a potential rich source of natural antioxidants. In this study, an ultrasound-assisted extraction (UAE) technique together with GRAS (generally recognized as safe) solvents (ethanol and water) was used to maximize the extraction of antioxidants from Thelephora ganbajun. Five extraction parameters (ethanol concentration, solvent to solid ratio, extraction time, temperature and ultrasound power) were investigated by single-factor experiments, and then a central composite rotatable design was employed to study interaction of three key extraction parameters. The optimum conditions were as follows: 57.38% ethanol, 70.15 mL/g solvent to solid ratio, 10.58 min extraction time, 40 °C extraction temperature and 500 W ultrasound power. Under the optimum conditions, the antioxidant activity obtained was 346.98 ± 12.19 µmol Trolox/g DW, in accordance with the predicted value of 344.67 µmol Trolox/g DW. Comparison of UAE with conventional maceration and Soxhlet extraction, the UAE method showed stronger extract efficiency in a shorter extraction time. These results showed that UAE was an effective technique to extract antioxidants from Thelephora ganbajun. Furthermore, the extracts obtained under the optimized conditions exhibited antiproliferative activities toward human lung (A549), breast (MCF-7), liver (HepG2) and colon (HT-29) cancer cells, especially for liver and lung cancer cells. In addition, rutin, 2-hydrocinnamic acid and epicatechin were identified in the extract, which might contribute to antioxidant and antiproliferative activities.
Subject(s)
Agaricales/isolation & purification , Plant Extracts/isolation & purification , Plant Extracts/pharmacology , Agaricales/chemistry , Agaricales/metabolism , Antioxidants/chemistry , Antioxidants/isolation & purification , Antioxidants/pharmacology , Cell Proliferation/drug effects , Ethanol/chemistry , HT29 Cells , Hep G2 Cells , Humans , MCF-7 Cells , Phenols/chemistry , Phenols/isolation & purification , Phenols/pharmacology , Plant Extracts/chemistry , Solid Phase Extraction , Solvents/chemistry , Sonication , TemperatureABSTRACT
Previous studies have shown that fruits have different effects on alcohol metabolism and alcohol-induced liver injury. The present work selected three fruits and aimed at studying the effects of Syzygium samarangense, Passiflora edulis and Solanum muricatum on alcohol-induced liver injury in mice. The animals were treated daily with alcohol and fruit juices for fifteen days. Chronic treatment with alcohol increased the levels of aspartate transaminase (AST), alanine transaminase (ALT), total bilirubin (TBIL), triglyceride (TG), malondialdehyde (MDA), and decreased total protein (TP). Histopathological evaluation also showed that ethanol induced extensive fat droplets in hepatocyte cytoplasm. Syzygium samarangense and Passiflora edulis normalized various biochemical parameters. Solanum muricatum increased the level of ALT and induced infiltration of inflammatory cells in the liver. These results strongly suggest that treatment with Syzygium samarangense and Passiflora edulis could protect liver from the injury of alcohol, while Solanum muricatum could aggravate the damage.