Mechanism of essential oil from Schizonepeta tenuifolia in treatment of depression based on network pharmacology and experimental verification / 中国中药杂志

This paper aimed to explore the antidepressant effect of the essential oil from Schizonepeta tenuifolia Briq.(EOST) on the treatment of depression and its mechanism by using a combination of network pharmacology and the mouse model of lipopolysaccharide(LPS)-induced depression. The chemical components in EOST were identified using gas chromatography-mass spectrometer(GC-MS), and 12 active components were selected as the study objects. The targets related to EOST were obtained by Traditional Chinese Medicines Systems Pharmacology(TCMSP) and SwissTargetPrediction database. The targets related to depression were screened out through GeneCards, Therapeutic Target Database(TTD), and Online Mendelian Inheritance in Man(OMIM) database. The Venny 2.1 was applied to screen out the common targets of EOST and depression. The targets were imported into Cytoscape 3.7.2 to generate "drug-active component-diease-target" network diagram. The protein-protein interaction(PPI) network was constructed using STRING 11.5 database and Cytoscape 3.7.2, and the core targets were screened out. DAVID 6.8 database was used for Gene Ontology(GO) func-tional enrichment analysis and Kyoto Encyclopedia of Genes and Genomes(KEGG) pathway enrichment analysis, and subsequently the enrichment results were visualized through the bioinformatics platform. The mouse model of depression was induced by intraperitoneally injecting with LPS in mice. Before modeling, mice were administrated orally with EOST. The antidepressant effect of EOST was evalua-ted by tail suspension test(TST), forced swimming test(FST), and novelty suppressed feeding test(NSFT) after modeling. The content of interleukin(IL)-1β was determined by enzyme-linked immunosorbent assay(ELISA), and the protein expression levels of IL-1β and pro IL-1β in the hippocampus were determined by Western blot. There were 12 main components and 179 targets in EOAT, of which, 116 targets were related to depression, mainly involved in neuroactive ligand-receptor interaction, calcium signaling pathway, and cyclic adenosine monophosphate(cAMP) signaling pathway. Biological processes such as synaptic signal transduction, G-protein coupled receptor signaling pathway, and chemical synaptic transmission were involved. Molecular functions such as neurotransmitter receptor activity, RNA polymerase Ⅱ transcription factor activity, and heme binding were involved. In mice experiments, the results showed that EOST at 100 mg·kg~(-1) and 50 mg·kg~(-1) significantly shortened the immobility time in TST and FST as well as the feeding latency in NSFT compared with the model group, decreased the levels of serum IL-1β and NO, and reduced the protein expression levels of IL-1β and pro IL-1β in the hippocampus. In conclusion, EOST shows a good antidepressant effect in a multi-component, multi-target, and multi-pathway manner. The mechanism may be attributed to the fact that EOST can down-regulate the protein expression levels of IL-1β and pro IL-1β, decrease the release of inflammatory factors, and reduce neuroinflammation response.

Identification and analysis of terpene synthase (TPS) gene family in Schizonepeta tenuifolia / 中国中药杂志

Terpenoids are important secondary metabolites of plants that possess both pharmacological activity and economic value. Terpene synthases(TPSs) are key enzymes in the synthesis process of terpenoids. In order to investigate the TPS gene family members and their potential functions in Schizonepeta tenuifolia, this study conducted a systematic analysis of the TPS gene family of S. tenuifolia based on the whole genome data of S. tenuifolia using bioinformatics methods. The results revealed 57 StTPS members identified from the genome database of S. tenuifolia. The StTPS family members encoded 285-819 amino acids, with protein molecular weights ranging from 32.75 to 94.11 kDa, all of which were hydrophilic proteins. The StTPS family members were mainly distributed in the cytoplasm and chloroplasts, exhibiting a random and uneven physical localization pattern. Phylogenetic analysis showed that the StTPS genes family were divided into six subgroups, mainly belonging to the TPS-a and TPS-b subfamilies. Promoter analysis predicted that the TPS gene family members could respond to various stressors such as light, abscisic acid, and methyl jasmonate(MeJA). Transcriptome data analysis revealed that most of the TPS genes were expressed in the roots of S. tenuifolia, and qRT-PCR analysis was conducted on genes with high expression in leaves and low expression in roots. Through the analysis of the TPS gene family of S. tenuifolia, this study identified StTPS5, StTPS18, StTPS32, and StTPS45 as potential genes involved in sesquiterpene synthesis of S. tenuifolia. StTPS45 was cloned for the construction of an prokaryotic expression vector, providing a reference for further investigation of the function and role of the TPS gene family in sesquiterpene synthesis.

Evaluation of spike quality of Schizonepeta tenuifolia based on fingerprint and chemometrics / 药学学报

The quality control and evaluation methods of Schizonepeta tenuifolia were established by HPLC fingerprint, multi index component content determination and chemical pattern recognition to provide basis for the quality control of medicinal materials. The chemical components of 25 batches of Schizonepeta tenuifolia panicle medicinal materials and decoction pieces collected were analyzed by high performance liquid chromatography, and the common pattern of fingerprint was established. A total of 22 common chromatographic peaks were calibrated, and their similarity was more than 0.9. The samples were divided into three categories according to different producing areas by cluster analysis. The results of principal component analysis and cluster analysis were consistent. Finally, five differential markers of different batches of Schizonepeta tenuifolia were selected by orthogonal partial least squares discriminant analysis. Through the identification of the reference substance, it was determined that peak 9 was hesperidin, peak 10 was rosmarinic acid, peak 13 was tilianin, peak 14 was quercetin, and peak 20 was pulegone. The quality evaluation method established in this study is stable and reliable, and is suitable for the quality control of Schizonepeta tenuifolia.

Gene Cloning and Bioinformatics Analysis of Limonene-3-hydroxylase from Schizonepeta tenuifolia / 中国实验方剂学杂志

Objective:This paper aims to clone the cDNA sequence of<italic> limonene</italic>-3-<italic>hydroxylase</italic>（<italic>StL</italic>3<italic>OH</italic>） in <italic>Schizonepeta tenuifolia</italic> and analyze its sequence by bioinformatics. Method:Specific primers were designed based on sequences of<italic> StL</italic>3<italic>OH </italic>gene screened from transcriptome sequencing data of <italic>S. tenuifolia</italic> and the cDNA sequence of <italic>StL</italic>3<italic>OH </italic>gene was cloned by reverse transcription polymerase chain reaction （RT-PCR） and analyzed for its bioinformatics. Result:The <italic>StL3OH</italic> gene cDNA sequence length was 1 598 bp，containing a 1 497 bp long complete open reading frame which encoded 498 amino acids. StL3OH protein had a theoretical relative molecular mass of 56.40 kDa，with a hydrophilic and unstable nature. Bioinformatics analysis showed that StL3OH protein had no signal peptide but had a transmembrane domain which might be located in endoplasmic reticulum. Multiple sequence alignment and cluster analysis showed that the amino acid sequence of MsL3OH protein had a high similarity with StL3OH protein，both of which contained cytochrome P450 heme binding region，belonging to the D subfamily of cytochrome CYP71 family. Codon bias analysis showed that <italic>StL</italic>3<italic>OH</italic> gene preferred guanine/cytosine（G/C） ending codon，with 27 skewed codons， and Nicotiana benthamiana was proven to be the most suitable host for exogenous expression of <italic>StL</italic>3<italic>OH</italic> gene. Conclusion:The cDNA sequence of<italic> StL3OH</italic> gene was cloned from <italic>S. tenuifolia</italic> for the first time，which will provide a basis for further study on the structure and function of StL3OH protein and the regulation mechanism of <italic>StL3OH </italic>gene in the accumulation and biosynthesis of monoterpenes in<italic> S. tenuifolia</italic>.

Study on Correlation of Chromaticity Value with Multiple Indicators in Schizonepeta tenui folia Charcoal of Different Processing Time / 中国药房

OBJECTIVE：To study the co rrelation of the chro maticity value of Schizonepeta tenuifolia charcoal of different processing time（0-40 min，similarly herein after）with multiple indicators ，and to reveal the quality change law of S. tenuifolia charcoal during processing and confirm the terminal time. METHODS ：The contents of ethanol-soluble extracts from S. tenuifolia charcoal decoction pieces of different processing time were determined. UPLC fingerprint of S. tenuifolia decoction pieces and S. tenuifolia charcoal decoction pieces of different processing time were established ，and the similarity evaluation was also conducted. The chromatographic peaks were confirmed by comparison with substance control. The same UPLC conditions were used to determine the contents of index components （hesperidin，rosmarinic acid ，menthone）in S. tenuifolia charcoal decoction pieces of different processing time. The colorimetric method was used to measure the chromaticity value of S. tenuifolia charcoal decoction pieces of different processing time. Meanwhile ，sample of processing 0 min was used as a control to calculate the total color value （E）and the total color difference value （ΔE）. Pearson correlation analysis ，cluster analysis and orthogonal partial least squares discriminant analysis （OPLS-DA）were performed on the ethanol-soluble extracts ，index component contents ，chromatographic peak area and chromaticity value. The terminal time of processing S. tenuifolia charcoal was conf irmed，and validation test was also conducted. RESULTS ：With the extension of processing time ， the content of ethanol-soluble extract in S. tenuifolia charcoal qq.com decoction pieces gradually decreased. A total of 17 chromato- graphic peaks were identified in 12 batches of S. tenuifolia decoction piece ，and its si milarity with the control fingerprint was greater than 0.9. 21 chromatographic peaks were identified in S. tenuifolia charcoal decoction pieces of different processing time，and its similarity with the chromatogram of sample of processing 0 min decreased with the processing time ，and the similarity after 18 min was lower than 0.9. The chromatographic peak 9 was hesperidin ，peak 10 was rosmarinic acid and peak 17 was menthone. The determination of content and chromaticity value showed that with the extension of processing time ，the contents of hesperidin ，rosmarinic acid and menthone decreased gradually ；the color L，b and E values of S. tenuifolia charcoal decoction piece powder decreased gradually ，and the a and ΔE values increased gradually. Pearson correlation analysis showed that the contents of ethanol-soluble extract ，hesperidin，rosmarinic acid and menthone ，the peak areas of 15 chromatographic peaks （peak 2，7-15，17-21）were significantly positively correlated with E value（P＜0.01）；the peak areas of 5 chromatographic peaks （peak 1，3-6）were significantly negatively correlated with E value（P＜0.01），but peak area of peak 16 was not related to E value（P＞ 0.05）. Results of cluster analysis showed that S. tenuifolia charcoal decoction pieces of different processing time were divided into 2 categories；the first category was processed for 0-16 min，and the second category was processed for 18-40 min. The results of OPLS-DA showed that the VIP values of peak 6 area（2.800 75），L value（2.327 54），peak 3 area（1.793 39），b value（1.735 78） and peak 5 area（1.244 04）were greater than 1. The final processing time of S. tenuifolia charcoal was 18 min. The results of validation experiment showed that the L，a and b values of S. tenuifolia charcoal decoction piece were 20.22-22.00，4.44-7.67， 9.78-13.00，and ΔE were 13.50-14.12，respectively. CONCLUSIONS ：The chromaticity value of S. tenuifolia charcoal decoction pieces of different processing time is closely related to the contents of ethanol-soluble extract ，hesperidin，rosmarinic acid ， menthone and the area of 20 chromatographic peaks. It is suggested that the terminal time of processing S. tenuifolia is 18 min.

Anti-inflammatory mechanism of main constituents in essential oil from schizonepeta tenuifolia briq. based on network pharmacology / 中国药理学通报

Aim To explore the main components and anti-inflammatory mechanisms of essential oil from Schizonepeta tenuifolia Briq. based on network pharmacology. Methods TCMSP and SwissTargetPrediction were utilized to obtain the corresponding targets of molecules, and the active components were screened. The molecular-target network was constructed. Then, protein-protein interaction analysis, GO analysis, and KEGG pathway analysis were performed. Finally, mo-lecular docking by SystemsDock was combined with previous literature. Results According to the results of network analysis, 13 main components corresponding to 45 targets were screened out. IL6, TNF, ILip, IL10, PTGS2, PTGS1, CHRMi, and CHRNA7 were important inflammatory targets through NF-kB and IL-17 signaling pathway. Biological processes such as response to drug, 7-aminobutyric acid pathway, and molecular functions such as extracellular ligand-gated ion channel activity, GABA-A receptor activity play a role in inflammation related to alcohol consumption, type 2 diabetes, psychiatric disorders, enteropathy, lung diseases, etc. 8,9-dehydrothymol, benzaldehyde, caryo-phyllene, a-humulene, D-germacrene, and pulegone were important anti-inflammatory components, exerting significant effects on CHRNA7, PTGS2 and PTGS1. Conclusion This method initially reveals the effective components and potential targets of essential oil from Schizonepeta tenuifolia Briq.

Optimization of the Extraction Technology of Volatile Oil from Schizonepeta tenuifolia and Forsythia suspensa / 中国药房

OBJECTIVE： To establish the method for content determination of volatile oil of Schizonepeta tenuifolia and Forsythia suspensa， and to optimize the extraction technology of the volatile oil. METHODS： The contents of β-pinene and pulegone were determined by GC method. The determination was performed on Hp-5 capillary column. The detector was hydrogen flame ion detector with programmed temperature. The sample size was 0.5 μL， the split ratio was 70 ∶ 1， the carrier gas was nitrogen， the inlet temperature was 250 ℃， the detector temperature was 280 ℃， the air flow rate was 390 mL/min， the hydrogen flow rate was 36 mL/min， the tail flow rate was 15 mL/min， and the nitrogen flow rate was 1 mL/min. Based on single factor test， orthogonal test combined with information entropy method were used to optimize the extraction technology of S. tenuifolia and F. suspensa using soaking time， extraction time， material-liquid ratio and forsythia grain size as factors， with the extraction amount of volatile oil， the content of β-pinene and pulegone and their comprehensive score as indexes.  RESULTS： The linear range of β-pinene and pulegone 1.575-7.875（r＝0.999 9） and 1.892-9.46 μg（r＝0.999 7）， respectively. The limits of quantitation were 0.10 and 0.25 μg； the limits of detection were 0.03 and 0.08 μg； RSDs of precision， stability and reproducibility tests were less than 2％ （n＝6）； the recoveries were 97.77％-100.01％ （RSD＝0.93％，n＝9） and 96.47％-99.00％（RSD＝0.89％， n＝9）. The optimal extraction technology was soaking 2 h， extracting for 6 h， 10-fold water （mL/g）， half a clove of granularity. Under this condition， the extraction amount of volatile oil， the contents of β-pinene and pulegone were 3.6 mL， 1 450.4 mg， 127.6 mg， respectively. RSD were 1.62％， 0.20％， 1.42％. CONCLUSIONS： Established method is simple， accurate and reproducible， and the optimal extraction technology is stable and feasible.

Study on mechanism of essential oils of schizonepeta tenuifolia briq. In endotoxin poisoning mice via NLRP3 inflammasome pathway / 中国药理学通报

Aim: To explore the mechanism of the antiinflammatory effect of essential oils of Schizonepeta tenuifolia Briq. (EOST) by investigating the regulatory effect on NLRP3 inflammasome pathway. Methods: EOST (0. 226, 0. 452 g · kg-1) were continuously administered for five days. Thirty minutes after the last administration, the mice were intraperitoneally injected with LPS (0.015 g · kg-1, 10 mL · kg-1) to construct endotoxin poisoning, and relevant indicators for sample determination were taken 12 h after modeling. Determination of NO level in lung tissues by Griess method was performed. The expressions of NLRP3, ASC, caspase-1, IL-1β, iNOS and p65 mRNA in lung tissues were detected by qPCR. The expressions of P2X7R and Cathepsin B protein in lung tissues were assessed using immunohistochemistry. The NLRP3, caspase-1(p20), Pro-caspase-1, COP-1 protein ex pressions were detected by Western blot. Results: 0.226 g · kg-1 EOST could down-regulate the expressions of Cathepsin B and NLRP3 proteins in lung tissues of mice; 0.452 g · kg-1 EOST significantly reduced NO level, the expressions of NLRP3, iNOS, p65, IL-1β mRNA and P2X7R protein in lung tissues of mice; EOST (0.226, 0.452 g · kg-1) markedly reduced the. caspase-1 (p20) protein level and significantly increased COP1 protein level. Conclusions: The protective effect of EOST on endotoxin poisoning mice is closely related to its anti-inflammatory effects, which involves the inhibition of activation of NLRP3 inflammasome.

Effects of drought stress on glandular trichomes,stomatal density and volatile exudates of Schizonepeta tenuifolia / 中国中药杂志

In this research,we explored the effect of three groups of water treatments,including severe drought(the corresponding water content of cultivated substrate 5%-10%),moderate drought(45%-50%) and control(85%-90%),and different drought stress time(15,30,45 d) on the glandular trichome density(TD),stomatal density(SD) and volatile exudates of Schizonepeta tenuifolia.The results showed that there were two kinds of glandular trichomes on the surface of S. tenuifolia leaves: peltate and capitate glandular trichomes. The density of capitate glandular trichomes(CTD) was higher than that of peltate glandular trichomes(PTD). Both CTD and PTD on the abaxial surface of leaf were higher than those on the adaxial surface. Under severe drought stress,the CTD and SD were higher than the other two treatments. Under the same stress time,the biomass and leaf surface area of S. tenuifolia decreased with the deepening of stress degree. As the stress time prolonged,the surface area of leaves and biomass gradually increased,and the TD and SD decreased. The most abundant compound in volatile exudates of S. tenuifolia was pulegone. Under drought stress,the relative content of pulegone decreased,and the relative content of other monoterpenoids such as D-limonene and menthone increased. The n-hexadeconic acid and 2-methyl-1-hexadecanol were detected only at the stress of 15 d,while menthone was detected at the stress of 30 d and45 d. Drought stress affected the leaf growth and secondary metabolism of S. tenuifolia.

Changes of ion absorption, distribution and essential oil components of flowering Schizonepeta tenuifolia under salt stress / 中国中药杂志

In this paper, a pot experiment using quartz sands was conducted to study the effects of different concentrations of NaCl (0, 25, 50, 75, 100 mmol·L⁻¹) on the ion absorption, distribution and essential oil components of flowering Schizonepeta tenuifolia. The results showed that as NaCl concentration increased, Na⁺ content of root, stem, leaf and flower increased significantly, and that of the aerial parts was in a higher level than in the root. Regarding the K⁺ content, it decreased in the root but increased in stem, leaf and flower. Some changes were detected in the Ca²⁺ content, but not significant on the whole. The value of K⁺/Na⁺ and Ca²⁺/Na⁺ reduced as a result of increasing NaCl concentrations. The content of essential oil increased under medium salt treatment (50 mmol·L⁻¹ NaCl). However, the synthesis and accumulation of essential oil was inhibited by the serious salt treatment (100 mmol·L⁻¹ NaCl). Over 98% of the essential oil components were terpenes, in which pulegone and menthone were the most two abundant compounds. Varieties of essential oil components did not change significantly under salt stress but their relative proportions did. The transformation of pulegone to menthone was enhanced and the value of pulegone/menthone based on their relative contents decreased with NaCl concentration increasing. Consequently, menthone ranked the most abundant compound by replacing pulegone. Relative content of D-limonene increased under medium and serious salt stress, and that of β-caryophyllene only increased under mild treatments. So our research could provide references for the standard cultivation on saline soil of S. tenuifolia.

Cluster Analysis of Karyotype and Resemblance-Near Coefficients of Schizonepeta tenuifolia Briq. from Different Producing Origins / 中国药学杂志

OBJECTIVE: To explore the karyotype features and genetic relationship among Schizonepeta tenuifolia Briq. from different producing origins. METHODS: The chromosome features of Schizonepeta tenuifolia Briq. from 11 different producing origins were analyzed by using root-tip squashing method and clustered by the karyotype resemblance-near coefficients. RESULTS: The Schizonepeta tenuifolia Briq. from 11 different producing origins all had 12 chromosomes. There were four types of karyotype formula: 2n=2x=12=4m+8sm, 2n=2x=12=8m+4sm, 2n=2x=12=6m+6sm and 2n=2x=12=4m+6sm+2st. The karyotypes of Yutianchun and Shanxi Schizonepeta tenuifolia Briq. were 2B type, and those of the other Schizonepeta tenuifolia Briq. were 2A type. The asymmetrical karyotype coefficients were not distinctively different, which ranged from 61% to 67%, and the karyotype of Sichuan Schizonepeta tenuifolia Briq. was the most primitive among all the samples, and the highest degree of evolution belonged to Anguoxia Schizonepeta tenuifolia Briq. The karyotype clustering analysis showed that Jiangsu and Sichuan Schizonepeta tenuifolia Briq had the highest karyotype resemblance-near coefficient (0.989) and the smallest evolutionary distance (0.011). The farthest genetic relationship existed between Zhejiang and Yutianchun Schizonepeta tenuifolia Briq., as shown by the minimum karyotype resemblance-near coefficient (0.792 5) and the maximum evolution distance (0.232 6). CONCLUSION: Karyotype is an important parameter for identification of medicinal plants. The genetic distances between 11 species of Schizonepeta tenuifolia Briq. are obtained by karyotype clustering analysis of karyotype resemblance-near coefficient. The results provide cytological information for the study of germplasms identification, genetic relationship and system evolution of Schizonepeta tenuifolia Briq.

Study of cancer cell apoptosis induced by Schizonepeta tenuifolia with microfluidic chip technology / 药学学报

This study was designed to elucidate the chemical composition and anti-cancer effects of Schizonepeta tenuifolia's ethanol extracts. Microfluidic technology was used in the study of Schizonepeta tenuifolia from 9 different geographic regions. The ethanol extracts were examined with HPLC to establish their Fingerprints in order to analyze the relationship between the spectrum and efficacy index through Grey Correlation software, and a rapid HPLC-Q-TOF/MS method was established. The result shows that chromatographic peaks of the 19, 6, 11, 16, 18th are the representative diosmetin, luteoloside, hesperidin, luteolin, and apigenin. The 10, 12, 20th peaks may be naringenin-7-O-glucuronide or quercitrin, rosmarinate or acetylcorynoline, and 5,7-dihydroxy-6,4-dimethoxy flavone. The major chemical composition of Schizonepeta tenuifolia was found to have the anti-lung-tumor effects. A new method was established for the quality control of traditional Chinese medicine.

Study on relationship between efficacy against lung cancer and different parts of Schizonepeta tenuifolia based on microfluidic chip technology / 中国中药杂志

In order to further clarify the rational use of different medicinal parts of Schizonepeta, microfluidic technology was used in this study to investigate the differences in drug efficacy against lung cancer in vitro. The ethanol extracts were examined with HPLC to establish their fingerprints in order to analyze the relationship between the spectrum and efficacy index through Grey Correlation software, and a rapid HPLC-Q-TOF/MS method was established. The result in vitro shows that the effect and components of different medicinal parts had a certain differences, and apoptosis and necrosis rate from big to small in turn is leaf, flower, root, stem. The chromatographic peaks of the 26, 12, 2, 6 and 15th are the luteolin, icynaroside, rosmarinic, caffeic acid, and hesperidin, while the 20 and 10th may be dan phenolic acid L and benzoic acid. On the one hand, preliminary study reflects that the root of Schizonepeta tenuifolia may be developed into the medicinal parts in future. On the other hand, the major chemical composition of S. tenuifolia was found to have the anti-lung-tumor effects. This new method was established for the quality control and the rational use of different parts of traditional Chinese medicine.

Determination of cafferic acid and rosmarinic acid in Perilla frutescens leaves and Schizonepeta tenuifolia by HPLC / 中草药

Objective: To establish an HPLC method for the simultaneous determination of cafferic acid and rosmarinic acid in Perilla frutescens leaves and Schizonepeta tenuifolia. Methods: The anaiysis was carried out on an Agilent C18 column (250 mm × 4.6 mm, 5 μm), and the mobile phase was composed of actonitrile and 0.1% phosphoric acid aqueous with gradient elution. The detection wavelength was 327 nm. The flow rate 1.0 mL/min at column temperature of 30 ℃. Results: Under the chromatographic condition, cafferic acid and rosmarinic acid were completely separated and other components had no effect on their determination. It showed a good linearity in the range of 0.69-22.12 and 3.65 -116.92 μg/mL. The average recoveries of P. frutescens leaves were 102.9% and 105.6%, and the RSD values were 1.8% and 1.9%. The average recoveries of S. tenuifolia were 101.2% and 101.0% and the RSD values were 2.4% and 1.9%. Conclusion: The established method is rapid, sensitive, accurate, and the test component peak separation degree is good, and could be used for the simultaneous determination of cafferic acid and rosmarinic acid in P. frutescens leaves and S. tenuifolia, which provides a scientific basis for the quality evaluation of P. frutescens leaves and S. tenuifolia.

GC Fingerprints of Essential Oil from Schizonepeta Tenuifolia Briq / 中国药师

Objective: To establish the GC fingerprints of essential oil for Schizonepeta tenuifolia Briq. to control the quality. Methods:The temperature of the feed inlet and detector was both 250℃, the carrier gas was nitrogen, and the flow rate was 2 ml· min-1 . The essential oil from ten batches of Schizonepeta tenuifolia Briq. was analyzed by GC-MS to determine the characteristic peaks and the similarity was studied as well. Results:The GC fingerprints of essential oil from Schizonepeta tenuifolia Briq. was established, and totally 13 characteristic peaks were calibrated with high similarity. Conclusion: The method is simple, precise and reliable. The established fingerprints can be used as one of the quality control index for essential oil from Schizonepeta tenuifolia Briq. .

Stem Blight Control of Schizonepeta tenuifolia Caused by Phytophthora nicotianae Using Trichoderma spp / 中草药·英文版

Objective To control stem blight disease of Schizonepeta tenuifolia caused by Phytophthora nicotianae.Methods The antagonist effect of 13 Trichoderma strains(including T.viride and T.hamianum)was evaluated upon mycelia growth of P.nicotianae.Trichoderma strains with high antagonistic activities against the pathogen were used to control stem blight of S.tenuifolia in the field.Results Of 13 Trichoderma strains tested,T.viride strain M3 showed maximum mycelia growth inhibition(83.2%)to the pathogen,followed by T.viride strain Tv04-2(78.2%)and then T.harziamum strain ThB(65.0%),in vitro.Fungal cell wall degrading enzymes,protease,and β-1,3-glueanase were analyzed qualitatively and quantitatively in further study.T.viride strains M3,Tv04-2,and T.harzianum strain ThB efficiently against P.nicotianae were used to control stem blight of S.tenuifolia in the field,and T.viride strain M3 showed the best biocontrol potential.Conclusion Trichoderma spp.can be used as alternatives of pesticides to control stem blight,one of the serious soilhome diseases of S.tenuifolia caused by P.nicotianae.However,though T.viride strains Tv04-2 aad T.harzianum strain ThB are also highly against P.nicotianae in vitro,the controlling efficacy of them on stem blight disease is not as excellent as T.viride strains M3 in the field.

Monoterpenoids from Schizonepeta tenuifolia / 中草药

Object To study the chemical constituents of Schizonepeta tenuifolia (Benth.) Briq.. Methods The monoterpenoid constituents of S. tenuifolia were separated on silica gel column and their structures were elucidated by spectral. Results Two new compounds and three known compounds were obtained. Conclusion The new compounds were identified as 3-hydroxy-4(8)-ene-p-menthane-3(9)-lactone and 1, 2-dihydroxy-8(9)-ene-p-menthane.