A rapid, sensitive, and selective precolumn derivatization method for the simultaneous determination of eight thiophenols using 3-(2-bromoacetamido)-<i>N</i>-(9-ethyl-9<i>H</i>)-carbazol as a labeling reagent by high-performance liquid chromatography with fluorescence detection has been developed. The labeling reagent reacted with thiophenols at 50°C for 50 min in aqueous acetonitrile in the presence of borate buffer (0.10 mol/L, pH 11.2) to give high yields of thiophenol derivatives. The derivatives were identified by online postcolumn mass spectrometry. The collision-induced dissociation spectra for thiophenol derivatives gave the corresponding specific fragment ions at <i>m/z</i> 251.3, 223.3, 210.9, 195.8, and 181.9. At the same time, derivatives exhibited intense fluorescence with an excitation maximum at λ<sub>ex</sub> = 276 nm and an emission maximum at λ<sub>em</sub> = 385 nm. Excellent linear responses were observed for all analytes over the range of 0.033-6.66 μmol/L with correlation coefficients of more than 0.9997. Detection limits were in the range of 0.94-5.77 μg/L with relative standard deviations of less than 4.54%. The feasibility of derivatization allowed the development of a rapid and highly sensitive method for the quantitative analysis of trace levels of thiophenols from some rubber products. The average recoveries (<i>n</i> = 3) were in the range of 87.21-101.12%.
Three new flavonol 3-O-glycosides, rhamnetin 3-O-[(S)-3-hydroxy-3-methyl-glutaroyl(1→6)]-β-D-glucopyranoside (1), rhamnocitrin 3-O-[(S)-3-hydroxy-3-methylglutaroyl(1→6)]-β-D-glucopyranoside (2), and isorhamnetin 3-O-[(S)-3-hydroxy-3-methylglutaroyl(1→6)]-α-L-rhamnopyranosyl(1→2)-β-D-glucopyranoside (3), along with 13 known compounds, were isolated from Oxytropis racemosa TURCZ. Their structures were deduced by means of spectroscopic methods and chemical evidence. 2 and 6 showed cytotoxic activities against HCT-8 (IC₅₀ 6.38 µM) and A549 (IC₅₀ 5.20 µM), respectively.
An accurate and sensitive liquid chromatography-tandem mass spectrometry method was developed for the analysis of amino acids (isoleucine, leucine, valine, tyrosine, phenylalanine and tryptophan) in serum samples using a stable isotope labeling strategy. Amino acid samples and standards were, respectively, derivatized by 10-methyl-acridone-2-sulfonyl chloride (d0-MASC) and its deuterated counterpart d3-MASC to form isotopic pairs which co-eluted and were detected by an MS detector at the same time. Accurate internal standard-based quantification was thereby achieved without the use of any internal standard analogy. The labeling reaction of MASC with amino acids is fast, simple and robust. Besides, derivatization increased the molecular weight of amino acids, and therefore they were shifted out of the background noise which was often observed in low mass region. The instrument LODs were in the range of 1.0-2.5 nmol/L. Linearities calculated by comparing theoretical peak area ratios of d0-/d3-MASC derivatives with the experimental peak area ratios were excellent with correlation coefficients of >0.995. The proposed method was successfully applied to the analysis of amino acids in serum samples with high sensitivity and accuracy.
Homopolymer PAN and triblock copolymer PAN-<b>b</b>-PMMA-<b>b</b>-PAN synthesized by RAFT polymerization were used to fabricate activated hierarchical porous carbon membranes by combining phase inversion, carbonization, and HNO3 activation method; during the preparation process, a lot of micro- and meso-pores generated because of phase separation of PAN and microphase separation of PAN-<b>b</b>-PMMA-<b>b</b>-PAN. The hierarchical porous structure shortened ions transport paths and facilitated the rapid migration of electrolyte ions. When the polymer membrane was prepared by the casting solution with 5 wt% of PAN-<b>b</b>-PMMA-<b>b</b>-PAN and the electrochemical performance was tested at the current densities from 0.5 to 5 A g−1, a high-end specific capacitance of 297.0 F g−1 and a capacitance retention of 75% were obtained in three-electrode configuration; this specific capacitance remained above 90% of initial value after 2000 cycles at 2 A g−1 in 6 M KOH aqueous solution. Moreover, symmetric supercapacitors assembled with the prepared materials achieved high energy density (15.8 Wh Kg−1) and power density (4000 W Kg−1) in 1 M Na2SO4 solution. The unique features and structures endowed the electrode membrane with good capacitive performance in both three-electrode and two-electrode configuration, which can be used as electrode membranes for high-performance energy storage devices and other applications.<br><br>Display Omitted<br>• An electrode membrane of activated hierarchical porous carbon was fabricated • Micro- and meso-pores generated due to the phase and microphase separation. • Effects of copolymer concentration on structure and performance were studied • High electrochemical performance for supercapacitor was obtained.
Meconopsis horridula is one of alpine plants belonging to family Papaveraceae, mainly distributed in Himalaya Range area. M. horridula is a rare alpine flower, and is a kind of traditional Tibetan medicine, which has been included in more than 40 compound formulae, having efficacies of clearing away heat and alleviating pain, activating blood circulation to remove stasis, traditionally used for the treatment of fractures, injuries, and chest and back pains. Modern research shows that the whole plant of M. horridula contains alkaloids, flavonoids, and terpenes, and its pharmacological activities including antitumor, antivirus and myocardial protection etc. However, due to various factors, the current research of M.horridula still faces many challenges. This paper summaries herein a progress of MH on its ecological resources, traditional uses, and studies on chemical constituents and pharmacological effects, hopefully to provide a useful reference for the ecological protection and applications.
Species identification and quality control of Tibetan medicines are an important part of its modernization studies, and they have important significance for ensuring the safety and effectiveness of Tibetan medicines in clinical application. In order to provide a reference for the modernization research of Tibetan medicines, this paper summarized the research progress of species identification, quality standards and quality evaluation of Tibetan medicines in the past 10 years. It also introduces the application examples of some new technologies and methods, such as DNA barcoding, infrared spectroscopy and 1H NMR-based metabolomics.; Copyright© by the Chinese Pharmaceutical Association.
Aim: To reinvestigate the chemical constituents of the ethanolic extract of Meconopsis quintuplinervia Regel which is a traditional Tibetan medicine used for treatments of hepatitis, tuberculosis etc..; Methods: The compounds were enriched by column chromatography techniques over silica gel, macro porous resin and Sephadex LH-20 absorbents, and finally purified by reverse phase preparative HPLC methods with isocratic mobile phase systems of methanol-H2O-acetic acid (500:500:1) and acetonitrile-H2O-acetic acid (200:800:1). Structural determination of the pure compounds were based on extensive analyses of modern spectroscopic methods including IR, MS, HRMS, 1D- and 2D-NMR spectra.; Results: Three alkaloids were obtained and their structures were elucidated as norsanguinarine (I), O-methylflavinantine (II) and 6-methoxy-17-methyl-2, 3-[methylenebis (oxy)]-morphin-5-en-7-one (III).; Conclusion: Norsanguinarine (I) was isolated from genus Meconopsis for the first time, and 6-methoxy-17-methyl-2,3-[methylenebis(oxy)]-morphin-5-en-7-one (III) is a new alkaloid named as meconoquintupline.;
This study using traditional Chinese medicine inheritance support software(TCMISS) to analyze the prescription rules of Tibetan medicine containing Terminalia chebula in the Encyclopedia of Chinese Medicine-Tibetan Medicine, Tibetan Medicine Composition Preparation of Modern Research and Clinical Application and Common Interpretation of Tibetan Medicine and so on. TCMISS(V2.5) was used to build a prescription database of Tibetan medicine containing T. chebula.The software statistical statement module, association rules and improved mutual information method and other data mining technologies were adopted to analyze the common herbs, combination rules and core combination of prescriptions containing T. chebula.Total 502 prescriptions containing T. chebula were analyzed and 14 common herbal combinations were summarized, whose ingredients mostly had the functions of clearing heat and detoxicating, promoting blood circulation and stopping pain, warming the middle-jiao and promoting the circulation of Qi. Prescriptions containing T. chebula were commonly used to treat 640 kinds of diseases, there are 22 kinds with high frequency(≥12) in which the representative "Tripa" disease, antiquated febrile symptoms, food poisoning had the highest frequency.T. chebula had different therapeutic effects through different compatibility.The complex composing and medication regularities of Tibetan medicine containing T. chebula have been clarified by TCMISS. That will provide reference for the clinical application of T. chebula and the new development.
To explore the medication regularity of Tibetan medicine in the treatment of spleen and stomach diseases, analyze the potential drug targets and interactions of the prescriptions, and reveal the mechanism of Tibetan medicine in the treatment of spleen and stomach diseases. The prescriptions in Tibetan medicine for treatment of spleen and stomach diseases were collected, and Traditional Chinese Medicine Inheritance Support System (TCMISS) was used to analyze the association rules between the herbs and discover the core herbs and new prescriptions. The integrated pharmacology platform V1.0 software was used to construct "herb-compound-target" network and investigate the interactions between various herbs and related pathways of Tibetan medicine Wuwei Shiliu powder in the treatment of spleen and stomach diseases. Among the 216 prescriptions of Tibetan medicine in the treatment of spleen and stomach diseases, pomegranate seed was used at a highest frequency (118 times), followed by white cardamom (107 times) and comatose (107 times). 12 new prescriptions were evolved by using the association rules (support>=34%, confidence>=0.85). 5 242 related drug targets and 20 related pathways were obtained from classic formula Wuwei Shiliu Powder (FDR<0.01). It was proposed that Tibetan medicine treatment for spleen and stomach diseases was mainly based on proliferation of "stomach fire" and the main drugs were for regulating Qi-flowing for strengthening spleen. The mechanism may be associated with regulation of digestive juice secretion, proton pump, mitochondria, regulation of intestinal digestion and immunity, the body's immunity to microorganisms function and other multiple targets and pathways to achieve the joint intervention.
In this paper, the varieties and origin of Primulaceae plants that used in Tibetan medicine were analyzed. The results showed that there were 3 genera and 44 species (including the varieties) of Primulaceae plants were recorded in the relevant literatures. Among them, 17 varieties were recorded in Tibetan names, 24 varieties were recorded in Chinese names and 1 variety was used in both of them. In current quality criteria of standards at all levels in China country, 6 varieties were recorded in Tibetan names and 6 original plants were involved, which were 35% and 14% of them respectively. Seventeen varieties were recorded in Chinese name and 7 original plants were involved, which were 30% and 16% of them respectively. In Tibetan medicine standards and literatures, there were big differences between Tibetan names and Chinese names which were translated from Tibetan names and its original plants. There were only regulations of morphological identification and microscopic authentication, so the standards were very inadequate. Therefore, through literatures research, resources and current situation investigations, combining the research and specification of the name and original of Tibetan medicine, the level of normalization and standardization could be enhanced, the stable and controllable safety and utility in clinical medication could be ensured to promote advancement of industry technology Tibetan medicine.
Graphical abstract Highlights • Five anthocyanidins are identified in Lycium ruthenicum Murray by UPLC-Q-Orbitrap MS. • Five anthocyanins are identified in Lycium ruthenicum Murray by UPLC-Q-Orbitrap MS. • Anthocyanin extracts hanve the activity of anti-gout. • Petunidin-3-glu has the activity of anti-gout. Abstract Lycium ruthenicum Murray (LR) represents an agricultural cash crop found in Northwest China and has been used in traditional folk medicine for a long time. However, detailed qualitative and quantitative analyses of LR anthocyanins, as well as their pharmacological research, remain scarce. In this work, we established a rapid method for the simultaneous identification and quantification of six anthocyanidins and six anthocyanins from LR via UPLC-quadrupole-Orbitrap mass spectrometry (UPLC-Q-Orbitrap MS) analysis. Finally, five anthocyanidins and five anthocyanins were qualitatively and quantitatively analyzed. Among these, 10 constituents (delphinidin-3-glu, cyanidin-3-glu, petunidin-3-glu, peonidin-3-glu, malvidin-3-glu, delphinidin, cyanidin, petunidin, pelargonidin and malvidin) were detected and petunidin-3-glu proved to be the predominant species in LR. Furthermore, the anti-inflammatory effects of anthocyanin extracts and petunidin-3-glu were investigated using a rat model involving gouty arthritis induced by monosodium urate. The levels of tumor necrosis factor-α (TNF-α), interleukin-1β (IL-1β), interleukin-18 (IL-18), prostaglandin E2 (PE2), cyclooxygenase-1 (COX-1) enzymes in serum, the paw COX-1 mRNA expression and paw volume could be determined to be significantly increased in rats suffering from gouty arthritis induced by monosodium urate. However, these indicators were found to be significantly reduced after treatment with anthocyanin extracts (200 mg/kg b.wt, p.o.) and petunidin-3-glu (40 mg/kg b.wt, p.o.). Taken in concert, our study shows that anthocyanin extracts and petunidin-3-glu may significantly reduce monosodium urate crystal-induced inflammation. Use and administration of these compounds may be potentially valuable for the further development and clinical applicability of the active compounds in this plant.
Lycium ruthenicum Murr. (LR) is a perennial shrub commonly used as a nutritional food and medicine. Herein, we identified 12 anthocyanins from LR, with petunidin derivatives constituting approximately 97% of the total anthocyanin content. Furthermore, the potential mechanism of anthocyanins exerting neuroprotective effects in d-galactose (d-gal)-treated rats was explored. Behavioral results showed that anthocyanins relieved d-gal-induced memory disorder. Additionally, anthocyanins reduced receptor for advanced glycation end products (RAGE) and suppressed oxidative stress caused by d-gal. Anthocyanins suppressed microgliosis and astrocytosis and reduced the overexpression of nuclear factor kappa B (NF-κB), interleukin-1-β (IL-1β), cyclooxygenase-2 (COX-2), and tumor necrosis factor-α (TNF-α). Moreover, anthocyanins lowered C-jun N-terminal kinase ( p-JNK), caspase-3 levels, and the B-cell lymphoma 2-associated X protein/B-cell lymphoma 2 (Bax/Bcl-2) ratio. Thus, anthocyanins from LR attenuated memory disfunction, neuroinflammation, and neurodegeneration caused by d-gal, possibly through the RAGE/NF-κB/JNK pathway, representing a promising, safe candidate for prevention and therapy of neurodegenerative diseases.
The aim of this study was to investigate the antidiabetic effects of a Tibetan medicine, Tang-Kang-Fu-San (TKFS), on experimental type 2 diabetes mellitus (T2DM) rats and to explore its underlying mechanisms. Firstly two major chemical compositions of TKFS, gallic acid and curcumin, were characterized by HPLC fingerprint analysis. Next T2DM in rats was induced by high-fat diet and a low-dose streptozotocin (STZ 35 mg/kg). Then oral gavage administration of three different doses of TKFS (0.3 g/kg, 0.6 g/kg, and 1.2 g/kg) was given to T2DM rats. Experimental results showed that TKFS dramatically reduced the levels of fasting blood glucose, fasting blood insulin, triglyceride, total cholesterol, LDL cholesterol, and HDL cholesterol, even though it did not alter the animal body weight. The downregulation of phosphorylation-AKT (p-AKT) and glucose transporter-4 (GLUT4) in skeletal muscle of T2DM rats was restored and abnormal pathological changes in pancreas tissues were also improved. Our work showed that TKFS could alleviate diabetic syndromes, maintain the glucose homeostasis, and protect against insulin resistance in T2DM rats, and the improvement of AKT phosphorylation and GLUT4 translocation in skeletal muscle would be one of its possible underlying mechanisms.
Dihuang powder (DHP) has been used in the traditional Chinese medicine for the treatment of diarrhea in some regions of China. But up to now, the anti-diarrheal activity of DHP haven't been performed with modern pharmacological technology. This study aims to investigate the quality control, the potential toxicity and anti-diarrheal activity of Dihuang powder in mice. High performance liquid chromatography (HPLC) and thin layer chromatography (TLC) were used to detect five active compounds in DHP for quality control, and the acute toxicity and sub-acute toxicity for 28-day oral administration of DHP were then evaluated. The anti-diarrheal activity was investigated using mouse model. Results showed that the levels of quercetin and berberine in DHP were 0.054 and 0.632 mg/g, respectively, and atractylodin, matrine, and patehouli aleohal were also detected in DHP. At the given doses, DHP was safe in terms of acute and sub-acute toxicity. Meanwhile, DHP exhibited strong anti-diarrheal effects as well as decreased gastrointestinal motility and the secretions induced by Sennae and castor oil in a dose-dependent manner. It could decrease the content of IL-1β, IL-6, and TNF-α in the small intestine, and improve the histopathological changes of small intestine and large intestine induced by Sennae. The antinociceptive and anti-inflammatory activities in vivo also were presented. Based on all of the results, we thought that DHP has anti-diarrheal activity, and could be used to treat diarrhea as well as alleviate the pain and inflammation induced by diarrhea. This study provides a theoretical basis for the clinical use of DHP and may assist in the development of new drugs for the treatment of diarrhea. The mechanism of the anti-diarrheal activity should be investigated in the future.
ETHNOPHARMACOLOGICAL RELEVANCE: Erigeron multiradiatus (Lindl.) Benth., an herb that grows in the alpine and subalpine meadow of Qinghai-Tibet plateau, has been widely used as a folk remedy by the native people for treatment of various inflammatory ailments.AIM OF THE STUDY: In order to isolate and identify the active components of Erigeron multiradiatus for anti-inflammatory activity, a preliminary phytochemical study and a bioassay-guided fractionation and purification process was performed. MATERIAL AND METHODS: The dry whole plant Erigeron multiradiatus was extracted with 50% ethanol and then separated into CHCl(3), n-BuOH, and aqueous fractions. The anti-inflammatory activities of each fraction were investigated using two in vivo inflammation models. RESULTS: These results exhibited varying degrees of anti-inflammatory activities and the n-BuOH fraction showed the strongest anti-inflammatory activities. The n-BuOH fraction was then subjected to separation and purification using macroporous resins column chromatography and Sephadex LH-20 leading to two flavonoids glucuronides identified as scutellarein-7-O-beta-glucuronide and apigenin-7-O-beta-glucuronide. Furthermore, LC-MS/MS identification and quantification of isolated compounds were also performed. CONCLUSION: Scutellarein-7-O-beta-glucuronide and apigenin-7-O-beta-glucuronide were considered as major components and principally responsible for the anti-inflammatory activity of Erigeron multiradiatus. Thus the results of our study provide a scientific basis for the utilization of Erigeron multiradiatus in traditional Tibetan medicine.
Background: Hypecoum leptocarpum Hook. f. et Thoms., which is used in traditional Tibetan medicine as an antipyretic, antitussive, analgesic, and anti-inflammatory agent, contains a variety of alkaloids that could be responsible for its analgesic and anti-inflammatory properties. Objective: The present study was designed to investigate the anti-inflammatory activity of the total alkaloids from H. leptocarpum (AHL) in vitro and to elucidate the chemical structure of the anti-inflammatory components in AHL. Materials and Methods: Chemical characterization was performed using liquid chromatography/quadrupole-time-of-flight mass and diode-array detector-high performance liquid chromatography. The anti-inflammatory effects of AHL were investigated by measuring the production of inflammatory cytokines using enzyme-linked immunosorbent assay and mRNA expression by real-time polymerase chain reaction in lipopolysaccharide-induced RAW 264.7 macrophages. Results: Chemical analysis of AHL revealed the presence of seven alkaloids, protopine (13.3%), cryptopine (1.5%), leptopidinine, leptocarpine, corydamine, dihydroleptopine, and oxohydrastinine. AHL significantly suppressed the production of nitric oxide (NO), interleukin-1 beta (IL-1 β), IL-6, and tumor necrosis factor-alpha (TNF-α) in LPS-induced RAW 264.7 cells. The maximum levels of suppression of NO, IL-1 β, IL-6, and TNF-α were 86.8% ± 2.2%, 70.1% ± 1.5%, 100.1% ± 2.5%, and 50.8% ± 3.6%, respectively. IC50values of suppression of cytokine production by AHL were 7.47 ± 2.81 μg/mL (NO), 0.12 ± 0.28 μg/mL (IL-1 β), 0.56 ± 0.37 μg/mL (IL-6), and 18.95 ± 5.23 μg/mL (TNF-α). AHL was also shown to downregulate mRNA expression of inducible NO synthase, IL-1 β, IL-6, and TNF-α in vitro. Conclusion: The study provides convincing evidence that AHL has strong anti-inflammatory activity. The potent activity is likely a result of synergy between the different alkaloids. Abbreviations used: The total alkaloids from H. leptocarpum: AHL; Nitric oxide: NO; Interleukin-1 beta IL-1β; Interleukin-6: IL-6; Tumor necrosis factor-alpha: TNF-α; Prostaglandin E2: PGE2; Inducible nitric oxide synthase: iNOS; Nonsteroidal anti-inflammatory drugs: NSAIDs; lipopolysaccharide: LPS; The total ion chromatograms: TIC; The liquid chromatography/quadrupole-time of flight: LC/Q-TOF; Nuclear factor-kappa B: NF-κB; Janus kinase-signal transducers and activators of transcription: JAK-STAT. [ABSTRACT FROM AUTHOR]
The seeds of Herpetospermum pedunculosun (Ser.) C.B.Clarke. (HPD), Mormodica cochinchinensis (Lour.) Spreng. (MCC) and Mormodica charantia L. (MCR) share the same common name ("Bolengguazi") in the Tibetan medicine. The anti-inflammatory activities of the three "Bolengguazi" were evaluated using egg album-induced paw edema and cotton-pellet granuloma tests. Among them, HPD is the most active one in both models. Results showed that oral administration of ethanol extract of HPD seed (200 and 400mg/kg) significantly suppressed the development of egg albumin-induced paw edema (P<0.01). In the chronic test, the ethanol extract of HPD seed (200 and 400mg/kg) showed significant reduction in granuloma weight of rats (P<0.05). The anti-inflammatory effect of the ethanol HPD seed was similar to that of indomethacin (10mg/kg). Moreover, the free radical scavenging activities of "Bolengguazi" were investigated using the DPPH test. Only the ethanol extract of HPD seed showed a moderate free radical scavenging effect on DPPH (IC50, 198.69 microg/ml) when compared with the positive control, V(E), (IC50, 44.91 microg/ml). The HPD seeds showed more significant anti-inflammatory activities in additional to higher free radical scavenging activities than that of the MCC and MCR seeds. The results of the present study provide a scientific basis to explain, in part, the popular use of HPD seed in Tibetan folk medicine as "Bolengguazi". The present study also supports the claims by the traditional Tibetan medicine practitioners about the use of HPD seeds in inflammatory diseases, such as "Chiba".
The seeds of <ce:italic>Herpetospermum pedunculosun</ce:italic> (Ser.) C.B.Clarke. (HPD), <ce:italic>Mormodica cochinchinensis</ce:italic> (Lour.) Spreng. (MCC) and <ce:italic>Mormodica charantia</ce:italic> L. (MCR) share the same common name (“Bolengguazi”) in the Tibetan medicine. The anti-inflammatory activities of the three “Bolengguazi” were evaluated using egg album-induced paw edema and cotton-pellet granuloma tests. Among them, HPD is the most active one in both models. Results showed that oral administration of ethanol extract of HPD seed (200 and 400 <ce:hsp sp="0.25"/>mg/kg) significantly suppressed the development of egg albumin-induced paw edema ( <ce:italic>P</ce:italic>
Dahuang Lidan Pian contains Rheum palmatum, Gymnadenia conopsea and Phyllanthus emblica, which has a significant effect in the treatment of alcoholic fatty liver, cholestasis and cholecystitis. The efficacy of the formula in traditional Chinese medicine was clearing heat and promoting diuresis, removing dampness, detoxifying and relieving jaundice. These three herbs are widely used in the traditional Chinese medicine, Mongolian medicine and Tibetan medicine. Therefore, the formula was a representative subject in the researches for ethno-drugs. In this research, computer aided drug design methods were used to predict the action targets of the formula. Protein interaction network (PIN) was then constructed, and molecular complex detection (MCODE) clustering algorithm was used to obtain the modules of the formula, so as to analyze the potential action mechanism. The results showed that Rh. palmatum and P. emblica may have a synergistic protective effect on liver function by acting on analogous targets and pathways. G. conopsea regulated metabolic balance of nutrients to strengthen physical fitness. The research explained the liver-protecting mechanism of Dahuang Lidan Pian based on the PIN analysis on molecular network, which provides an reference for the further study of Dahuang Lidan Pian.
• <b>Saxifraga tangutica</b> Engl. is a promising source of antioxidants against DPPH and FRAP. • The 50% ethanol extract of S. <b>tangutica</b> showed strong antioxidative activity against DPPH and FRAP. • Eight phenols were isolated from S. <b>tangutica</b>; all of the compounds are reported for the first time from this plant. • The antioxidative S. <b>tangutica</b> extracts and isolated phenols supports the antioxidant of this plant.<br><b>Saxifraga tangutica</b> Engl., is a medicinal herb that grows on the Qinghai-Tibet Plateau. Extracts and phenols from the Qinghai population have been subjected to antioxidative assays against DPPH radical-scavenging and reducing power (FRAP). The 50% ethanol extract showed strong antioxidative activity against DPPH and FRAP, with IC50 ± SEM [μg/mL] values of 9.38 ± 0.46 and 15.46 ± 0.52, respectively. The antioxidative activity-guided fractionations were performed according to the DPPH and FRAP screening results. Fourteen fractions from the 50% ethanol extract showed dissimilar antioxidative activity against DPPH and FRAP of 8.16 ± 0.76 ∼ 38.42 ± 0.58 μg/mL and 13.22 ± 0.68 ∼ 61.47 ± 0.49 μg/mL. The chemical assay-guided separation of the active fractions (fractions 3, 6, 7 and 8) led to eight phenols: protocatechuic aldehyde (<b>1</b>), ethyl gallate (<b>2</b>), rhododendrin (<b>3</b>), <b>p</b>-hydroxyacetophenone (<b>4</b>), rhododendrol (<b>5</b>), protocatechuic acid ethyl ester (<b>6</b>), frambinone (<b>7</b>) and ethylparaben (<b>8</b>). All phenols are reported here for the first time from <b>S. tangutica</b> Engl. Protocatechuic aldehyde (<b>1</b>), ethyl gallate (<b>2</b>), rhododendrin (<b>3</b>) and protocatechuic acid ethyl ester (<b>6</b>) showed strong antioxidative activities (IC50 ± SEM [mM] between 8.79 ± 0.15 and 4.25 ± 0.47 and between 6.15 ± 0.48 and 2.83 ± 0.49) against DPPH and FRAP.
The actinomycetes strain, lut0910, was isolated from polluted soil and identified as the Rhodococcus species with 99% similarity based on the sequence analysis of 16S recombinant DNA. The extract of this strain demonstrated in vivo and in vitro antitumor activity. The treatment of two human cancer cell lines, hepatocellular carcinoma HepG2 and cervical carcinoma Hela cells, with the lut0910 extract caused the delay in cell propagation in a dose-dependent manner with an IC50 of 73.39 and 33.09 µg/mL, respectively. Also, the oral administration of lut0910 extract to the mice with a solid tumor resulted in the inhibition of tumor growth in comparison with a placebo group. The thymus and spleen indexes were significantly increased in mice groups treated with the lut0910 extract. The histopathological changes of the tumor tissues showed that there were massive necrotic areas in the tumor tissues after treatment with different doses of the lut0910 extract. Our result would provide a new way and potent source for development of new anticancer agent from the polluted environment.