Natural Products Journal, The - Current Issue
Volume 15, Issue 9, 2025
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Dodecanoyl-L-tryptophan: A Novel Natural Antibiotic Isolated from Mesophotic Sponge-associated Salinicola sp. LHM and its Biological Function
Authors: Hongmei Lu, Qicheng Zhang, Xuejiao Zhang, David P. Fewer, Huamao Wei, Shufen He, Yanzhu Zhang, Peng Li, Jingxuan Wang, Xue Di, Shan He and Liwei LiuBackgroundSponge-associated microbiota plays a crucial role in maintaining host health by providing chemical defense through the synthesis of diverse secondary metabolites. However, research on these secondary metabolites is still in its early stages.
ObjectiveThe present study aimed to investigate new natural antibiotics from mesophotic sponge symbiotic microbiota and explore its in vitro antibacterial activity and preliminary biological function.
MethodsBacteria strain Salinicola sp. LHM was isolated from sponge L. birotulata L26 and identified based on the 16S rRNA gene analysis. Subsequently, the strain was fermented using a liquid M9 medium and screened for antibiotics with an antibacterial guiding assay. Extensive chromatographic methods were introduced to isolate the target compound, and its chemical structure was elucidated by spectroscopic analysis (LC-MS, NMR). The minimum inhibitory concentration (MIC) and cytotoxicity experiments evaluated the isolated compound's biological activity. Furthermore, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and quartz crystal microbalance with dissipation (QCM-D) were used to study the bactericidal mechanism of DLT. Finally, the preliminary biological function was explored by performing the cell-feeding experiment.
ResultsWe successfully identified one novel natural antibiotic, dodecanoyl-L-tryptophan (DLT), in Salinicola sp. LHM isolated from mesophotic sponge Lotrochota birotulata L26. DLT exhibited potent antibacterial activity against the Bacillus subtilis and Staphylococcus aureus, with MIC values of 32 μM and 16 μM, respectively. The bactericidal tests showed that DLT broke the cell membrane to cause cell death by leaking the cell's inner content. Furthermore, the cell-feeding experiment proved that DLT producer- Salinicola sp. LHM could feed on the inner content of death cells. In addition, DLT also exhibited cytotoxicity against bronchial epithelial cells BEAS-2B, with an EC50 value of 150 μM, indicating a favorable selectivity profile.
ConclusionThis research identified one novel natural antibiotic DLT and provided initial insights into the chemical defense exerted by Salinicola sp. LHM with its secondary metabolite DLT.
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A Review on Functional Gastrointestinal Disorders: Irritable Bowel Syndrome and its Association with Obesity
Authors: Pooja Rawat, Saumya Das, Bhavani Pentela, Priyanka Bansal, Lovely and Dileep Singh BaghelWorldwide, Functional Gastrointestinal Disorders (FGIDs) are common, although their prevalence varies among cultures, ethnic groups, and geographic regions. FGIDs, now referred to as Disorders of Gut-Brain Interactions (DGBIs), encompass a variety of chronic or recurrent gastrointestinal symptoms that are not related to structural or morphological abnormalities. Irritable Bowel Syndrome (IBS) and Functional Dyspepsia are two of the most common examples of FGIDs. According to the Rome IV criteria established in 2016, these disorders are classified based on specific diagnostic guidelines. The Rome Foundation is expected to launch the updated Rome V criteria in 2026. IBS is one of the most common types of FGID. The causes of IBS include a range of factors such as dietary habits, psychological influences, and genetic predispositions. The role of neurotransmitters such as serotonin, norepinephrine, histamine, dopamine, and gamma-aminobutyric acid (GABA) has been identified in the development of IBS. Due to gender differences, it is anticipated that the symptoms and treatment approaches for men and women with IBS may vary. Studies have shown that IBS is more frequent in women than in men. Various treatment strategies are used for the management of IBS, including medications (such as laxatives, antidepressants, and analgesics), lifestyle modifications, and herbal approaches. Increasing emphasis is being placed on plant-based products and probiotics. Management often differs from one individual to another; a treatment that works for one person may not be effective for another. Different studies have suggested an association between obesity and FGIDs, particularly IBS. Some research indicates that obesity could exacerbate the inflammatory processes associated with IBS, while other studies suggest a bidirectional link between IBS and obesity. Common pathophysiological features found in both obesity and IBS include alterations in the gut microbiome, changes in intestinal permeability, visceral hypersensitivity, and low-grade inflammation.
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Natural Product Interventions in Peripheral Diabetic Neuropathy: A Multi-target Approach
Authors: Monosiz Rahaman and Sourav GhoshPeripheral diabetic neuropathy (PDN) is a well-known impediment of diabetes mellitus. That is one of the common kinds of neuropathy, categorized by reduced neuronal function in the minor limbs including excruciating neurological pain. A medical examination is used to subclassify asymmetric and symmetric neuropathy. Diabetes is associated with several pathways, one of which is the activation of the polyol route, the production of oxidative stress, poly ADP-ribose polymerase, the formation of advanced glycation outputs, and the pathways of hexosamine. Although there are a few symptomatic and supportive treatments in use, like antiarrhythmics, tricyclic medications, aldose reductase, opioid analgesics, protein kinase C inhibitors, and incretin the results are unimpressive. To bridge this space, herbal product-based treatment can be a very successful replacement. This narrative review tries to understand the research currently accessible on the function of different biological entities in the treatment of PDN. These chemicals are essential for lowering aldose reductase activity, oxidative-nitrosative stress, and neuronal death. They improve axonal regeneration, nerve transmission velocity, as well as antioxidant molecules while controlling glucose and HbA1c%. (Malondialdehyde, catalase, superoxide dismutase). They are renowned for their ability to reduce heat and mechanical hyperalgesia as well as tactile allodynia. Thus, these substances need to have their animal study and clinical efficiency assessed. Natural compounds may be auspicious participants in the fight against PDN that provide a glimpse of optimism to those in need.
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Carnosic Acid and its Pharmacological Activities: An Updated Review
Carnosic acid (CA), a polyphenolic diterpene naturally found in Rosmarinus officinalis, has demonstrated a wide range of pharmacological activities according to scientific research, making it a key candidate for new therapeutic product development. The aim of this manuscript is to present an updated review of the literature on the latest research findings about carnosic acid, emphasizing its most relevant biological functions. Accordingly, this work highlights the main reported pharmacological activities, such as antioxidant, antidiabetic, anti-inflammatory, antimicrobial, antiobesity, anticancer, and neuroprotective properties. We conducted a systematic search of bibliographic databases for peer-reviewed literature based on a specific review question, utilizing scientific databases including PubMed, Scopus, Science Direct, and Google Scholar published since 1990. Numerous studies have highlighted the extensive therapeutic applications of carnosic acid. Among others, carnosic acid was found to have antioxidant, antidiabetic, anti-inflammatory, antimicrobial, antiobesity, anticancer, and neuroprotective activities. Further, carnosic acid displayed low toxicity levels and few side effects. CA shows great promise as a therapeutic agent in the prevention and treatment of many diseases, such as numerous cancers, infectious diseases, and newly emerging illnesses like Alzheimer’s and Parkinson’s diseases. In recent times, there has been a significant push to improve PBMs, proposing their application as natural drugs for several pathological conditions, with a focus on their anti-inflammatory and antioxidant capabilities. Carnosic acid exhibits antidiabetic, antimicrobial, antiobesity, and neuroprotective effects, as well as antitumor, anti-infectious, CNS, and endocrine system activities. However, further research on its precise pharmacological mechanisms is required before it can be reliably used to treat human diseases.
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The Influence of Some Environmental Factors on Temporary Degradation of Organic Components of Paper Pulp and Writing Compositions
Paper sheet materials and written compositions are complex multi-component mixtures, including dyes, solvents and resins, preservatives, and antioxidants, i.e., complex organic mixtures that change over time. Technical examination of materials and documents is in demand in the judicial and archival industry. Determining the actual date of appearance of a particular inscription on a sheet of paper is one of the most important and complex expert tasks. The task is divided into two components: analysis of the processes of temporary degradation of paper pulp and processes of temporary degradation of organic writing materials.
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Phytochemical Profiling of Aquilaria malaccensis Lam. Essential Oils and their Antiproliferative Potential against HeLa Human Cervical Cancer Cells
BackgroundAquilaria malaccensis Lam. is one of the very few lign-aloes trees that can produce highly valuable resin-impregnated heartwood, commonly known as agarwood.
AimThis study aimed to determine the chemical profile of A. malaccensis essential oil and describe its antiproliferative effects against the HeLa cervical cancer cell line.
MethodThe essential oils hydro-distilled from agarwood were characterised using GC−MS with the aid of spectral deconvolution. The antiproliferative effects were evaluated via the MTT assay.
ResultA total of 143 metabolites were tentatively identified in two different grades of essential oils, which accounted for 56.80% and 78.19% of the total ion counts, respectively. These metabolites were distributed over the chemical families of monoterpenes, sesquiterpenes, cyclic hydrocarbons, and others. The essential oils exhibited antiproliferative activities, with IC50 values of 79.42 and 128.77 µg/mL, respectively.
ConclusionThe results have suggested the chemical differences in secondary compounds to be the main factor contributing to the decrease in cell viability. Further investigations are warranted to understand its mechanisms of action and its potential use in cervical cancer treatment.
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Natural Bioactives and their Nano-formulations for Management of Acne Vulgaris: A Comprehensive Review
Managing acne presents a multifaceted challenge for teenagers, impacting their physical appearance and emotional well-being. The multifactorial nature of acne, which involves hyperactive oil glands, follicular hyperkeratinization, bacterial activity, and inflammation, emphasizes the importance of effective treatment strategies. This review provides a comprehensive overview of the role of natural bio-actives and their Nano-formulations in addressing acne. Additionally, this review highlights numerous anti-acne formulations composed of natural components and the methods used to formulate Nano-formulations with anti-acne properties. Potential mechanisms of action for natural elements used in Nano-formulations, such as aloe Vera, green tea extract, grape extract, cucumber extract, lavender essential oil, and tea tree oil, are explored. These natural components contain phytoconstituents that play key roles in skin repair and the treatment of several skin conditions, such as acne, aging, UV-induced skin damage, surgical wounds, psoriasis, and eczema. Furthermore, the review discusses patents filed for acne treatment using natural components and addresses challenges in formulating anti-acne products such as quality, availability, cost, and method validations.
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Phytochemical Screening of Genus Primula Species Growing in Georgia and Study of their Antioxidant and Anti-inflammatory Potentials
BackgroundIn traditional medicine, species of the genus Primula L. are used to treat various health conditions, such as eye disorders, respiratory infections, headaches, epilepsy, insomnia, as expectorants, and to promote wound healing.
ObjectiveThe goal of this article was to evaluate the antioxidant and anti-inflammatory activities of three species from genus Primula L. growing in Georgia: Primula macrocalyx, Primula woronowii and Primula saguramica.
MethodsInitially, fractions containing both aerial and underground parts were air-dried, ground, and extracted with 80% ethanol. The extract was then concentrated by condensation and further dried through freeze-drying. Subsequently, additional chromatographic separations were carried out on Diaion HP-20 using solvents such as water, methanol (50% and 100%), and 100% ethyl acetate to isolate the desired fractions. To identify flavonoids and triterpene glycosides, the study employed thin-layer chromatography (TLC) alongside preliminary phytochemical tests. The antioxidant activity of these species was estimated in vitro by cell-free systems using ABTS and DPPH assays. The extracts' anti-inflammatory properties were evaluated using an ex-vivo cell system that isolated neutrophils. The study examined the extracts' impact on reactive oxygen species (ROS) production in neutrophils stimulated with PMA, as well as their effect on the catalytic activity of myeloperoxidase (MPO), a marker of inflammation in neutrophils.
ResultsFlavonoids and triterpene glycosides were primarily identified in the 50% and 100% methanol (MeOH) fractions of Primula species through TLC and preliminary phytochemical tests. For each experiment, gallic acid and quercetin served as standards at a concentration of 1 mg/ml, while the tested samples were prepared at concentrations of 5 mg/ml. Based on the IC50 findings, P. w 3 exhibits the most potent antioxidant and anti-inflammatory properties, as evidenced by the following indicators: ABTS - IC50=8.51 ± 0.18; DPPH - IC50=34.57 ± 0.47; PMN - IC50=0.68 ± 0.04; SIEFED - IC50=1.49 ± 0.7; and classical IC50=1.89 ± 0.01.
ConclusionAmong the tested fractions, only the fraction of the 3 species prepared in MeOH (50%) showed the best dose-dependent antioxidant and anti-inflammatory activities, especially P.w 3 which is probably related to the high flavonoid content found in this species.
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New Therapeutic Targets for Cynodon Dactylon in Atherosclerosis: Attenuation of TMAO Generation and Down-regulation of TLR-4 in Rats
Authors: Belal Pashaie, Rahim Hobbenaghi and Hassan MalekinejadPurposeAtherosclerosis (AS) is a chronic disease with worldwide incidence. The current study was conducted to highlight the molecular pathogenesis of AS and equally effectiveness of cynodon dactylon–(tm)s ethanolic extract (CDE) on the AS-induced injuries.
MethodsAtherosclerosis was induced experimentally in healthy male rats with a hypercholesterolemic diet (HCD) for 24 weeks. The HCD-received animals were either treated with normal saline or various doses of CDE and/or atorvastatin. After 24 weeks of the treatment period, the effects of HCD on lipid profile, oxidative/nitrosative stress status, inflammatory enzymes (LDH, ALP and CK-MB) activities, trimethylamine oxide (TMAO) concentration in serum along with the expression of TLR-4 (qPCR) and CD31 (Immunohistochemistry) in coronary and aorta were analyzed.
ResultsCDE was able to reduce the HCD-enhanced cholesterol and triglycerides. The HCD-elevated activities of LDH, ALP and CK-MB were declined by CDE. The antioxidant potency of CDE was comparable with atorvastatin on HCD-induced oxidative/nitrosative stress. The serum concentration of TMAO was lowered (1.7-fold) by CDE in a dose-dependent manner, while CD31 expression in the endothelial of coronary arterials and aorta in CDE and atorvastatin-received animals was remarkably increased. The up-regulated expression of TLR-4 (2.5-fold) at mRNA level was regulated significantly (p < 0.05) and returned to normal level by CDE treatment.
ConclusionResults of the current study indicate that the up-regulation of TLR-4 as a main inflammatory gene and elevation of TMAO are involved in the pathophysiology of AS. Moreover, the protective effects of CDE on AS may be attributed to its anti-inflammatory and hypolipidemic properties.
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Milestones in the Technology of Modified Starch in Pharmaceutical Formulation
More LessCarbohydrates, the most prevalent class of organic substances in living systems, play a variety of important roles, such as in the creation of energy, the construction of biological structures, and the synthesis of paper and food. More advanced uses of modified starch have been introduced over the past millennium, demonstrating that modified starches are promising excipients in drug delivery, an area in which their role and range of utility continuously increase. Technological advancements in the pharmaceutical field have led to the development of new and highly stable molecules with enhanced properties for novel drug delivery systems. Innovative starches from various sources present exclusive support in the development of novel dosage forms.
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Unveiling the Underlying Mechanisms Related to the Biological Activities of Cynometra cauliflora
Authors: Siti Rosmani Md Zin, Noor Eliza Hashim, Srijit Das and Intan Suhana ZulkafliCynometra cauliflora Linn. (C. cauliflora), a member of the Fabaceae family within the Cynometra genus, is an underrated medicinal plant in Malaysia. It features frog-like fruits and is known locally as Namnam. The plant grows in tropical regions and is used in the traditional treatment of various medical conditions. Previous studies have revealed a broad range of its pharmacological benefits, including antioxidant, anti-inflammatory, anti-diabetic, anti-lipase, anti-diarrheal, cytotoxic, anti-microbial, and anti-cholinesterase properties. The active constituents identified in C. cauliflora are thought to contribute to its diverse range of biological activities. Research shows that different parts of C. cauliflora contain phenolic compounds, tannins, saponins, and flavonoids. The leaves and bark also have cardiac glycosides, while the fruit is rich in flavonoids, triterpenoids, saponins, and tannins. Furthermore, ethanol extracts of its leaves were found to contain vitamin C and its major constituent, vitexin. In this review, the biological activities of C. cauliflora are explored and reviewed through various literature sources, aiming to highlight the mechanisms and compounds that underlie its potential as a source for natural therapies.
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