Terpenoid Compounds Research Articles

Changes in Metabolite Profiling and Expression Levels of Key Genes Involved in the Terpenoid Biosynthesis Pathway in Garden Sage (Salvia officinalis) under the Effect of Hydrazine Hydrate.

Mutagenesis is a highly efficient tool for establishing genetic variation and is widely used for genetic enhancement in various plants. The key benefit of mutation breeding is the prospect of enhancing one or several characteristics of a variety without altering the genetic background. In this study, we exposed the seeds of Salvia officinalis to four concentrations of hydrazine hydrate (HZ), i.e., (0%, 0.1%, 0.2%, and 0.3%) for 6 h. The contents of terpenoid compounds in the S. officinalis plantlets driven from the HZ-treated seeds were determined by GC-MS, which resulted in the identification of a total of 340 phytochemical compounds; 163 (87.48%), 145 (84.49%), 65 (97.45%), and 62 (98.32%), from the four concentrations of HZ (0%, 0.1%, 0.2%, and 0.3%), respectively. Furthermore, we used the qRT-PCR system to disclose the "transcriptional control" for twelve TPS genes related to terpenoid and terpene biosynthesis, namely, SoGPS, SoMYRS, SoNEOD, SoCINS, SoSABS, SoLINS, SoFPPS, SoHUMS, SoTPS6, SoSQUS, SoGGPS, and SoGA2. Altogether, results are likely to ensure some positive relationship between the concentrations of the chemical mutagen HZ used for treating the seeds, the type and amount of the produced terpenes, and the expression of their corresponding genes.

Cannabis sativa-based oils against aluminum-induced neurotoxicity

The use of terpenoid compounds in different neural-related conditions is becoming useful for several illnesses. Another possible activity of these compounds is the reduction of nervous impairment. Cannabis sativa plants are known for their concentration of two important terpenoids, the delta-9-tetrahydrocannabinol (THC) and cannabidiol (CBD). CBD and THC have central peripheral activities already described and their usage in different brain diseases, such as Alzheimer's and multiple sclerosis. Aluminum (Al) is known as an important neurotoxic compound, the physiological action of Al is not known already, and in high concentrations can lead to intoxication and cause neurotoxicity. Here we evaluated the potential effect of two different doses of CBD- and THC-rich based oils against Al-induced toxicity, in the zebrafish model. We evaluated behavioral biomarkers of the novel tank test (NTT) and social preference test (SPT), and biochemical markers: the activity of the enzyme acetylcholinesterase (AChE) and the antioxidant enzymes—catalase, superoxide dismutase, and glutathione-S-transferase. CBD- and THC-based oils were able to increase the AChE activity helping the cholinergic nervous system actuate against Al toxicity which was reflected by the behavioral biomarkers changes. We concluded that the oils have a protective effect and might be used with proposals for neurological and antioxidant impairment avoidance caused by Al intoxications.

Antidiabetic Effect of Actinodaphne angustifolia and Profiling of Bioactive Metabolites using UPLC-QToF/ESI-MS Method

Diabetes mellitus is a chronic disorder that causes elevated blood glucose levels due to a lack of insulin, either completely or partially. We investigated the antidiabetic property of Actinodaphne angustifolia in a rat model and identified the bioactive phytochemicals by using the UPLC-QTOF/ESI-MS method. The rats’ pancreatic structures, lipid profile and blood glucose were assessed after a one-week intervention. UPLC-QTOF/ESI-MS analysis was conducted to identify flavonoids and terpenoids in the leaf extract. Actinodaphne angustifolia extract markedly increased the high-density lipoprotein (HDL) (p<0.05) while reducing total cholesterol (TC), low-density lipoprotein (LDL) and blood glucose. Furthermore, the tissue architecture of pancreatic islets was also well recovered as compared to the control group. A total of 45 flavonoids and 109 terpenoid compounds were identified using UPLC-QTOF/ESI-MS-based analysis and additional studies should be undertaken to identify the potential antidiabetic agents.

Study of Bioactive Compounds and Resources of Some Species of Wormwood (Artemisia abrotanum L., A. maritima L., A. pauciflora Weber, A. issaevii Rzazade) Distributed in the Flora of Azerbaijan

As a result of analysis of the literature data and our research, for the first-time distribution of the species Artemisia abrotanum L., A. maritima L., A. pauciflora Weber, A. issaevii Rzazade in different regions of Azerbaijan by obtaining bioactive compounds typical for them is confirmed in the article in detail. Distribution, resources, ecological features, as well as useful properties of wormwood (Artemisia L.) species found in the flora of Azerbaijan were studied by us, their possibilities of use in various fields of folk and agriculture were recommended. General distribution areas, biological and ecological features of all species were studied. Essential oil was obtained using the Ginsberg hydrodistillation method and component content was determined by the method of Gas Chromato-Mass Spectroscopy. Gas Chromato-Mass Spectroscopy was performed using Agilent 5977A MS gas chromatography and Agilent 7890 GC inert Mass Selector Detector. A. abrotanum L., which is new for the flora of Azerbaijan, two new substances, steroids (β-sitosterol St-1, stigmasterol St-1) was obtained from A. maritima L. species three substances, α-santonin, artemisin, glabellin was obtained. In the composition of the aerial part of the species A. pauciflora Web., 60 terpenoid compounds were identified, 17 components were detected by mass spectroscopy.

Analisis Kualitatif Metabolit Sekunder dan Aktivitas Antioksidan Jamur Endofit Cangkang Bulu Babi (Diadema setosum)

Endophytic fungi are fungi that live in plant tissues for a certain period and can form colonies in the host's tissues without endangering the host itself. In addition to plants, endophytic fungi are also found in marine biota. Endophytic fungi that live in the internal organs or tissues of marine biota, whether in the form of mold or yeast, can transform the nutrients they obtain from their host animals into metabolite compounds which will then be transferred back to the host organs so that they have the same metabolites as their hosts. This study aimed to analyze and test the antioxidant activity of the secondary metabolites of sea urchins in the Tomini Bay area. The method used from the beginning of the research was endophytic microbial fermentation, production of secondary metabolites, and partitioning of endophytic microbial isolates, namely liquid-liquid; the method used to test antioxidant activity was qualitative using TLC plates, DPPH UV-Vis spectrophotometer method, color reagent, and thin layer chromatography. Two isolates of endophytic fungi were obtained, namely (JBB1, JBB2). The isolate that was active as an antioxidant was JBB2 from sea urchins in the Tomini Bay area with an ICso 50-100 ppm, which was in the strong category. Meanwhile, JBB2 isolate was carried out at a wavelength of 517 nm with a value absorbance of 0,707 A. In accordance with the value of the linear equation, it obtained y = 0,092x+36,95 and an R2 value = 0,945 that the ethyl acetate extract in JBB2 had a moderate ICs of 87.43 µg/mL. Meanwhile, the qualitative test of secondary metabolites using thin layer chromatography with n-hexane eluent: ethyl acetate (8:2) ethyl acetate extract contained alkaloid and terpenoid compounds.

Cocoa volatile compounds affect aroma but not taste

Flavor is one of the most essential indicators for determining the quality of cocoa beans, especially fine flavor cocoa. The volatile compound in the beans affect the mechanism the flavor emergence. Therefore, this study aimed to identify the volatile compound in the aromatic and non-aromatic cocoa groups as one of FFCs indicator. It was conducted at the Indonesian Coffee and Cocoa Research Institute, Jember, East Java, Indonesia. Furthermore, the genetic material used consisted of six aromatic cocoa genotypes, such as DR 2, ICCRI 03, ICCRI 07, ICCRI 09, MCC 02, and TSH 858 as well as four non-aromatic genotypes such as Sulawesi1, Sulawesi 2, KW 516, and KEE 2. A completely randomized block design (RCBD) was used with three repetitions. The fermented bean samples of each genotype were analyzed of volatile compound at the Food and Science Laboratory, Jember Polytechnic, East Java and sensory test was conducted by three certified panelists from ICCRI. Data were analyzed by orthogonal contrast analysis with IRRI's STAR 2.0.1 software. While the Microsoft Excel 2019 and R Studio were used for correlation analysis and heatmaps. The results showed aldehydes, acids, esters, pyrroles, and pyrazines of aromatic cocoa bean group higher than the non-aromatic. The alanine and terpenoid compounds was only found in clones DR 2 and ICCRI 03, while the alcohol and phenol compounds dominated in the non-aromatic group. Genotypes were grouped into six groups, based on flavor and volatile compound. ICCRI 09 characterized by strong acidity with a fresh fruit, spicy and sweet aroma as well as containsed aldehydes. Furthermore, ICCRI 03, MCC 02, and TSH 858 bean had weaker acidity and aroma than ICCRI 09 and contain terpenoids. ICCRI 07 had a nutty and woody aroma and was dominated by furan and pyrazine compounds. While Sulawesi 1 had a putrid aroma and alkaloids. The genotype groups of KW 516, KEE2, and Sulawesi 2 had astringent taste, dirty/dusty and moldy aroma as well as contained alcohol and phenol. Keywords: Aromatic; Flavor; Non-aromatic; Theobroma cacao L; Volatile compounds

Developing TeroENZ and TeroMAP modules for the terpenome research platform TeroKit.

Terpenoids and their derivatives are collectively known as the terpenome and are the largest class of natural products, whose biosynthesis refers to various kinds of enzymes. To date, there is no terpenome-related enzyme database, which is a desire for enzyme mining, metabolic engineering and discovery of new natural products related to terpenoids. In this work, we have constructed a comprehensive database called TeroENZ (http://terokit.qmclab.com/browse_enz.html) containing 13 462 enzymes involved in the terpenoid biosynthetic pathway, covering 2541 species and 4293 reactions reported in the literature and public databases. At the same time, we classify enzymes according to their catalytic reactions into cyclase, oxidoreductase, transferase, and so on, and also make a classification according to species. This meticulous classification is beneficial for users as it can be retrieved and downloaded conveniently. We also provide a computational module for isozyme prediction. Moreover, a module named TeroMAP (http://terokit.qmclab.com/browse_rxn.html) is also constructed to organize all available terpenoid enzymatic reactions into an interactive network by interfacing with the previously established database of terpenoid compounds, TeroMOL. Finally, all these databases and modules are integrated into the web server TeroKit (http://terokit.qmclab.com/) to shed light on the field of terpenoid research. Database URL http://terokit.qmclab.com/.

Identification of Terpenoid Compounds and Toxicity Assays of Essential Oil Microcapsules from Artemisia stechmanniana.

Plant essential oils, as biological pesticides, have been reviewed from several perspectives and play a key role in chemical ecology. However, plant essential oils show rapid degradation and vulnerability during actual usage. In this study, we conducted a detailed analysis of the compounds present in the essential oils of A. stechmanniana using gas chromatography-mass spectrometry (GC-MS). The results showed seventeen terpenoid compounds in the A. stechmanniana oil, with four major terpenoid compounds, i.e., eucalyptol (15.84%), (+)-2-Bornanone (16.92%), 1-(1,2,3-Trimethyl-cyclopent-2-enyl)-ethanone (25.63%), and (-)-Spathulenol (16.38%), in addition to an amount of the other terpenoid compounds (25.26%). Indoor toxicity assays were used to evaluate the insecticidal activity of Artemisia stechmanniana essential oil against Aphis gossypii, Frankliniella occidentalis, and Bactericera gobica in Lycium barbarum. The LC50/LD50 values of A. stechmanniana essential oils against A. gossypii, F. occidentalis, and B. gobica were 5.39 mg/mL, 0.34 mg/L, and 1.40 μg/insect, respectively, all of which were highly efficient compared with azadirachtin essential oil. Interestingly, A. stechmanniana essential oil embedded in β-cyclodextrin (microencapsule) remained for only 21 days, whereas pure essential oils remained for only 5 days. A field efficacy assay with the A. stechmanniana microencapsule (AM) and doses at three concentrations was conducted in Lycium barbarum, revealing that the insecticidal activities of AM showed high efficiency, maintained a significant control efficacy at all concentrations tested, and remained for 21 days. Our study identified terpenoid compounds from untapped Artemisia plants and designed a novel method against pests using a new biopesticide on L. barbarum.

Development of a yeast reporter gene assay to detect ligands of freshwater cladoceran Daphnia magna ultraspiracle, a homolog of vertebrate retinoid X receptors.

Endocrine-disrupting chemicals (EDCs) often affect homeostatic regulation in living organisms by directly acting on nuclear receptors (NRs). Retinoid X receptors (RXRs), the most highly conserved members of the NR superfamily during evolution, function as partners to form heterodimers with other NRs, such as retinoic acid, thyroid hormone, and vitamin D3 receptors. RXRs also homodimerize and induce the expression of target genes upon binding with their natural ligand, 9-cis-retinoic acid (9cRA), and typical EDCs organotin compounds, such as tributyltin and triphenyltin. In the present study, we established a new yeast reporter gene assay (RGA) to detect the ligands of freshwater cladoceran Daphnia magna ultraspiracle (Dapma-USP), a homolog of vertebrate RXRs. D.magna has been used as a representative crustacean species for aquatic EDC assessments in the Organization for Economic Corporation and Development test guidelines. Dapma-USP was expressed along with the Drosophila melanogaster steroid receptor coactivator Taiman in yeast cells carrying the lacZ reporter plasmid. The RGA for detecting agonist activity of organotins and o-butylphenol was improved by use of mutant yeast strains lacking genes encoding cell wall mannoproteins and/or plasma membrane drug efflux pumps as hosts. We also showed that a number of other human RXR ligands, phenol and bisphenol A derivatives, and terpenoid compounds such as 9c-RA exhibited antagonist activity on Dapma-USP. Our newly established yeast-based RGA system is valuable as the first screening tool to detect ligand substances for Dapma-USP and for evaluating the evolutionary divergence of the ligand responses of RXR homologs between humans and D.magna.

A cytosolic bifunctional geranyl/farnesyl diphosphate synthase provides MVA-derived GPP for geraniol biosynthesis in rose flowers

Geraniol derived from essential oils of various plant species is widely used in the cosmetic and perfume industries. It is also an essential trait of the pleasant smell of rose flowers. In contrast to other monoterpenes which are produced in plastids via the methyl erythritol phosphate pathway, geraniol biosynthesis in roses relies on cytosolic NUDX1 hydrolase which dephosphorylates geranyl diphosphate (GPP). However, the metabolic origin of cytosolic GPP remains unknown. By feeding Rosa chinensis "Old Blush" flowers with pathway-specific precursors and inhibitors, combined with metabolic profiling and functional characterization of enzymes invitro and in planta, we show that geraniol is synthesized through the cytosolic mevalonate (MVA) pathway by a bifunctional geranyl/farnesyl diphosphate synthase, RcG/FPPS1, producing both GPP and farnesyl diphosphate (FPP). The downregulation and overexpression of RcG/FPPS1 in rose petals affected not only geraniol and germacrene D emissions but also dihydro-β-ionol, the latter due to metabolic cross talk of RcG/FPPS1-dependent isoprenoid intermediates trafficking from the cytosol to plastids. Phylogenetic analysis together with functional characterization of G/FPPS orthologs revealed that the G/FPPS activity is conserved among Rosaceae species. Site-directed mutagenesis and molecular dynamic simulations enabled to identify two conserved amino acids that evolved from ancestral FPPSs and contribute to GPP/FPP product specificity. Overall, this study elucidates the origin of the cytosolic GPP for NUDX1-dependent geraniol production, provides insights into the emergence of the RcG/FPPS1 GPPS activity from the ancestral FPPSs, and shows that RcG/FPPS1 plays a key role in the biosynthesis of volatile terpenoid compounds in rose flowers.

FORMULATION FOR MAKING HAND SANITIZER BASED ON DURIAN PEEL EXTRACT (DURIO ZIBETHINUS MURR) IN IMPROVING ANTIBACTERIAL ABILITY

Maceration using ethanol solvent was chosen in extracting durian rind which was then evaporated to obtain 50 grams of durian peel extract. The results of the phytochemical screening test showed that the durian rind contains tannin compounds as evidenced by the addition of Iron (III) chloride reagent to produce a black solution. In addition, durian peel also contains terpenoid compounds which have been proven using the Lieberman Burchard reagent so that a blackish brown ring is produced in the extract. The best hand sanitizer product formulation is 75 mL of 96% ethanol, 2 mL of glycerin, 3 mL of 3% hydrogen peroxide, 10 mL of distilled water and 10 mL of a 6% concentration of durian peel extract solution. The hand sanitizer product has a liquid form, has a clear brownish color, has a distinctive durian rind aroma with a pH around 6 indicating that the hand sanitizer is suitable for use. Concentration of 6% Durian fruit peel hand sanitizer has better antibacterial ability than other concentrations with a large inhibition zone of 12.4 mm which is categorized as a strong level as an antibacterial substance.

Research Progress on Cannabinoids in Cannabis (Cannabis sativa L.) in China.

Cannabis (Cannabis sativa L.) is an ancient cultivated plant that contains less than 0.3% tetrahydrocannabinol (THC). It is widely utilized at home and abroad and is an economic crop with great development and utilization value. There are 31 countries legalizing industrial cannabis cultivation. Cannabis fiber has been used for textile production in China for 6000 years. China is the largest producer and exporter of cannabis. China may still play a leading role in the production of cannabis fiber. China has a long history of cannabis cultivation and rich germplasm resources. Yunnan, Heilongjiang, and Jilin are three Chinese provinces where industrial cannabis can be grown legally. Cannabinoids are terpenoid phenolic compounds produced during the growth, and which development of cannabis and are found in the glandular hairs of female flowers at anthesis. They are the active chemical components in the cannabis plant and the main components of cannabis that exert pharmacological activity. At the same time, research in China on the use of cannabis in the food industry has shown that industrial cannabis oil contains 13-20% oleic acid, 40-60% omega-6 linoleic acid, and 15-30% omega-3 α-linolenic acid. At present, more than 100 cannabinoids have been identified and analyzed in China, among which phenolic compounds are the main research objects. For instance, phenolic substances represented by cannabidiol (CBD) have rich pharmacological effects. There are still relatively little research on cannabinoids, and a comprehensive introduction to research progress in this area is needed. This paper reviews domestic and foreign research progress on cannabinoids in cannabis sativa, which is expected to support cannabis-related research and development.

PENGOLAHAN LENGKUAS MENJADI LENGKUAS BUBUK UNTUK MENGOPTIMALKAN PEMANFAATAN LENGKUAS DI DESA PENIMBUNG, KEC. GUNUNG SARI, LOMBOK BARAT

Penimbung Village is one of the galangal producing villages in Gunungsari District. West Lombok Regency. Galangal or galangal is a type of spice that is often used in Indonesian food. The problems faced by galangal farmers in Penimbung Village are the low selling price of galangal, the lack of innovation in galangal processing and the rapid decline in harvest quality caused by pests resulting in blackened and dried (damaged) galangal. Based on the potential and existing problems, new innovations are needed in galangal processing which can increase the price and durability of galangal by processing galangal into powdered galangal which has a long shelf life. The galangal powder produced consists of two variants, namely fine galangal powder and coarse powdered galangal. The resulting galangal is packaged using a standing pouch so that it is easier to store, hygienic and more practical to use. In addition, packaging also serves to increase the economic value of the product. The study results of galangal contain terpenoid compounds such as galanoklaton, 16-dial, 12-labdiene-1510.25 Galanoklaton, 16-dial, 12-labdiene-15 which is classified as a diterpene and 1.8 cineol which is a monoterpene group. These compounds function to give a distinctive aroma to dishes and eliminate fishy odors in several types of dishes. Galangal is a medicinal plant that contains antimicrobial diterpenes and eugenol which can kill fungi and stop their growth. Traditionally, galangal rhizome is used as a medicine for skin diseases caused by fungi, such as ringworm, scabs, boils, and others. This innovation is expected to be a solution to the problems faced by galangal farmers in Penimbung Village.

Formulation of patchouli oil spray gel (Pogostemon cablin Benth) and irritation test in rabbit

Patchouli plant ( Pogostemon cablin Benth) is one of the essential oil-producing plants widely used in perfume, cosmetic, aromatherapy, antiseptic, antibacterial, and antifungal industries. The essential oil derived from patchouli leaves contains terpenoid compounds with antibacterial and antifungal activity. This study aims to determine the optimum formulation of patchouli oil spray gel as a wound antiseptic and to observe the irritation test of the samples. The spray gel formulations of patchouli oil were prepared in various concentrations i.e. 5%, 7.5%, and 10% (v/v), solved in aqua dest with the addition of carbopol 940 as the gelating agent. The spray gels were tested to determine their physical characteristics, including the organoleptic test, homogeneity test, pH, adhesive dispersion test, viscosity test, and spray pattern test. The results showed that the patchouli oil spray gels were yellowish-white and had a distinctive odor and homogeneous texture with a pH 5. They all had adhesive dispersion, and the optimum viscosity of the spray gel was found at a 7.5% (v/v) concentration of patchouli oil. The irritation test was carried out using the patch test method with a score of erythema and edema. The results showed that all three formulas very mild irritation.

OeBAS and CYP716C67 catalyze the biosynthesis of health-beneficial triterpenoids in olive (Olea europaea) fruits.

The bioactive properties of olive (Olea europaea) fruits and olive oil are largely attributed to terpenoid compounds, including diverse triterpenoids such as oleanolic, maslinic and ursolic acids, erythrodiol, and uvaol. They have applications in the agri-food, cosmetics, and pharmaceutical industries. Some key steps involved in the biosynthesis of these compounds are still unknown. Genome mining, biochemical analysis, and trait association studies have been used to identify major gene candidates controlling triterpenoid content of olive fruits. Here, we identify and functionally characterize an oxidosqualene cyclase (OeBAS) required for the production of the major triterpene scaffold β-amyrin, the precursor of erythrodiol, oleanolic and maslinic acids, and a cytochrome P450 (CYP716C67) that mediates 2α oxidation of the oleanane- and ursane-type triterpene scaffolds to produce maslinic and corosolic acids, respectively. To confirm the enzymatic functions of the entire pathway, we have reconstituted the olive biosynthetic pathway for oleanane- and ursane-type triterpenoids in the heterologous host, Nicotiana benthamiana. Finally, we have identified genetic markers associated with oleanolic and maslinic acid fruit content on the chromosomes carrying the OeBAS and CYP716C67 genes. Our results shed light on the biosynthesis of olive triterpenoids and provide new gene targets for germplasm screening and breeding for high triterpenoid content.

Antibacterial Activity Test of Yoghurt Paste Red Fruit (Pandanus conoideus Lam.) Against Escherichia coli

Background: Red fruit (Pandanus conoideus Lam.) contains phenol, terpenoid, alkaloid, tannin, and steroid compounds which function as antibacterial. Yoghurt is a fermented milk product with a manufacturing process by adding two types of lactic acid starter: Lactobacillus bulgaricus and Streptococcus thermophilous. Objective: This study aimed to determine the pH, water content, total solid content, ash content, total lactic acid, and antibacterial activity against Escherichia coli in red fruit (Pandanus conoideus Lam.) paste yoghurt. Method: This study used an experimental approach by making red fruit paste yoghurt in three formulas with different concentrations, namely F1 (10%), F2 (15%), and F3 (20%). An antibacterial activity test was conducted using the disc diffusion method. Results: The results obtained from all tests were the pH in formula 1, 2, and 3, namely 4.7; 4.9, and 4.9; the water content in formula 1, 2, and 3 were 63.33%; 44.66%, and 60.66%; the total solids content of formula 1, 2, and 3 were 36.66%; 55.33%, and 39.33%; the ash content in formula 1, 2, and 3 were 1.40%; 1.66%, and 1.13%; total lactic acid in formula 1, 2, and 3, namely 1.97%; 1.71%, and 2.09%; inhibition zone of antibacterial activity in formula 1, 2, and 3, namely 10.50 mm; 12.47mm, and 13.18mm. Conclusion: In total solids and total lactic acid qualified for Indonesian National Standard (SNI) requirements, while pH, water content, and ash content did not qualify for SNI requirements. Antibacterial activity in red fruit paste yoghurt is a potent category.

Thin Layer Chromatography Bio-autography guided identification of Antibacterial constituents of leaf extract of Stereospermum kunthianum Cham. (Bignoniaceae)

Background: There is an incessant quest for the discovery of novel antibacterial agents. Stereospermum kunthianum Cham.  Bignoniaceae) is used in traditional medicine in Nigeria and other parts of Africa in the treatment of venereal diseases e.g., syphilis,  wounds, refractory cough, malaria, tooth ache leprosy etc. The present work investigates the antimicrobial activity and phytochemical constituents of the ethanolic leaf extract of the plant.  Methods: Ethanolic leaf extract of S.Kunthianum was obtained by macerations method. Agar well diffffusion method was used to carry  out preliminary antimicrobial susceptibility testing. The test was carried out at extract concentration of 100, 200 and 400 mgmL-1 . The  agar dilution method was used to determine the Minimum Inhibitory Concentration (MIC) of the extracts. Phytochemical screening  was conducted using standard procedures. Thin layer chromatography bioautography analysis was carried out using the agar overlay  method. Six micro-organisms including two gram positive- Bacillus subtilis and Staphylococcus aureus, two gram negative Salmonella  typhi , and Pseudomonas aeruginosa, two fungi, Aspergillus niger and Candida albicans were used as test organisms.  Results: The ethanol extracts of S.kunthianum leaves showed antimicrobial activity against B.subtilis, S.aureus and S.typhi with zones of  Inhibition ranging from 13±1.41 to 29.5 ± 1.00 mm and MIC values ranging from 16 -64 mgmL-1 . Phytochemical screening revealed the  presence of saponins, flflavonoids and terpenoid compounds  Conclusion: The study showed that the antibacterial activities of the leaf extract are probably due to polyphenolic and steroidal  compounds.  &nbsp

Analysis of Floral Scent and Volatile Profiles of Different Aster Species by E-nose and HS-SPME-GC-MS.

Plants from the Aster species are known to be a rich source of bioactive chemical compositions and are popularly known for their medicinal properties. To investigate the relationship between the nine species of Aster, the floral fragrance and volatile profile patterns were characterized using E-nose and HS-SPME-GC-MS. Initial optimization for fragrance analysis was performed with Aster yomena using E-nose by evaluating the scent patterns in different flowering stages. Aster yomena exhibited varied scent patterns in each flowering stage, with the highest relative aroma intensity (RAI) in the full flowering stage. PCA analysis to compare and analyze the scent characteristics of nine Aster species, showed a species-specific classification. HS-SPME-GC-MS analysis of flowers from nine Aster species revealed 52 volatile compounds including β-myrcene, α-phellandrene, D-limonene, trans-β-ocimene, caryophyllene, and β-cadinene. The terpenoid compounds accounted for the largest proportion. Among the nine Aster species flowers, Aster koraiensis had sesquiterpenes as the major component, and the remaining eight varieties had monoterpenes in abundance. These results could distinguish the species according to the scent patterns and volatile components of the nine Aster species. Additionally, flower extracts from the Aster species' plants exhibited radical scavenging antioxidant activity. Among them, it was confirmed that Aster pseudoglehnii, Aster maackii, and Aster arenarius had high antioxidant activity. In conclusion, the results of this study provide fundamental data of the volatile compound properties and antioxidant activity of Aster species, offering basic information of valuable natural sources that can be utilized in the pharmaceutical, perfume, and cosmetic industries.

Investigation of Geraniol Biotransformation by Commercial Saccharomyces Yeast Strains by Two Headspace Techniques: Solid-Phase Microextraction Gas Chromatography/Mass Spectrometry (SPME-GC/MS) and Proton Transfer Reaction-Time of Flight-Mass Spectrometry (PTR-ToF-MS)

Hop-derived volatile organic compounds (VOCs) and their transformation products significantly impact beer flavour and aroma. Geraniol, a key monoterpene alcohol in hops, has been reported to undergo yeast-modulated biotransformation into various terpenoids during fermentation, which impacts the citrus and floral aromas of the finished beer. This study monitored the evolution of geraniol and its transformation products throughout fermentation to provide insight into differences as a function of yeast species and strain. The headspace concentration of VOCs produced during fermentation in model wort was measured using Solid-Phase Microextraction Gas Chromatography/Mass Spectrometry (SPME-GC/MS) and Proton Transfer Reaction-Time of Flight-Mass Spectrometry (PTR-ToF-MS). In the absence of yeast, only geraniol was detected, and no terpenoid compounds were detected in geraniol-free ferments. During fermentation, the depletion of geraniol was closely followed by the detection of citronellol, citronellyl acetate and geranyl acetate. The concentration of the products and formation behaviour was yeast strain dependent. SPME-GC/MS provided confidence in compound identification. PTR-ToF-MS allowed online monitoring of these transformation products, showing when formation differed between Saccharomyces cerevisiae and Saccharomyces pastorianus yeasts. A better understanding of the ability of different yeast to biotransform hop terpenes will help brewers predict, control, and optimize the aroma of the finished beer.

The effect of 1,2-dioleoyl-3-trimethylammonium propane (DOTAP) Addition on the physical characteristics of β-ionone liposomes

β-ionone (ION) is a cyclic terpenoid compound that demonstrates considerable potential for the prevention and treatment of cancer. However, the water solubility of β-ionone is poor and the compound demonstrates low permeability. Liposomes have been reported as increasing both qualities. In this study, the development of β-ionone liposomes was initiated by adding 1,2-dioleoyl-3-trimethylammonium propane (DOTAP) to produce cationic liposomes as a means of enhancing binding to cancer cells. Liposomes composed of β-ionone, HSPC, cholesterol, and DSPE-mPEG2000 were prepared using the thin layer hydration method. Cellular uptake studies were carried out with HeLa cells incubated with β-ionone liposomes for two hours. The results indicated that the addition of DOTAP increased particle size and affected the spectroscopical and thermogram profiles of the liposomes, thereby confirming reduction in liposome crystallinity, while the zeta potential became positive. Moreover, the calcein release profile further showed that additional DOTAP increased both membrane fluidity and cellular uptake in HeLa cells In conclusion, adding DOTAP affected the physicochemical cationic properties of liposome and improved cellular uptake in HeLa cells.