Piper nigrum is one amongst the thousands of the plants which have been bestowed with rich medicinal values.The work has been done to explore the therapeutic potential of piperine from Piper nigrum and synthesize of some piperine analogues.
The work has been planned to carry out detailed phytochemical studies to isolate and characterize the main alkaloidal phytoconstituents i.e. piperine present in the methanolic extract. The basis of selection of piperine is its CNS depressant activity and to expect the synthesis of some potent CNS Depressants derived from piperine after isoloation.
Further, the piperine and its semi-synthetic analogues have been screened for its CNS Depressants activity.
Table of Contents
1. INTRODUCTION
1.1. NATURAL PRODUCT AND DRUG DISCOVERY
1.2. SEMI-SYNTHETIC PATHWAY
1.3. SELECTION OF RECEPTORS
1.4. INTRODUCTION OF THE PLANT
2. LITERATURE SURVEY
2.1. SOURCES OF LITERATURE
2.2. CHEMICAL INVESTIGATIONS
2.3. PHARMACOLOGICAL INVESTIGATIONS
2.4. MICROBIOLOGICAL INVESTIGATIONS
2.5. SYNTHETIC INVESTIGATIONS
3. RATIONALE, OBJECTIVES & PLAN OF WORK
4. EXPERIMENTAL WORK
4.1. PHYTOCHEMICAL STUDIES
4.2. COMPUTATIONAL STUDIES
4.3. SEMI-SYNTHETIC STUDIES
4.4. PHARMACOLOGICAL STUDIES
5. SUMMARY AND CONCLUSION
Research Objectives & Topics
The primary research objective is to synthesize novel piperine analogues with enhanced central nervous system (CNS) depressant activity compared to the parent compound, piperine, by targeting glutamate receptors via computational and experimental approaches.
- Identification and isolation of piperine from Piper nigrum
- Computational docking studies against glutamate receptor subunits
- Semi-synthesis of piperine analogues (PIP-2 and PIP-3)
- Structural characterization via spectroscopic methods (FT-IR, NMR, Mass)
- Pharmacological evaluation of anticonvulsant activity in animal models
Excerpt from the Thesis
1.1. NATURAL PRODUCT AND DRUG DISCOVERY
Natural product drug discovery describes the use of natural resources in the process of finding new drug compounds. Together with synthetic chemistry, they represent complementary strategies for lead identification in drug discovery.
For more than 50 year, natural products have served us well combating infectious bacteria and fungi. During the 20th century, microbial and plant secondary metabolites helped to double our life span, reduced pain and suffering, and revolutionized medicine. The increased development of resistance to older antibacterial, antifungal, antitumor drugs has been challenged by (1) newly discovered antibiotics (e.g. candins, epothilones); (2) new semi-synthetic versions of old antibiotics (e.g. ketolides, glycylcylines); (3) older underutilized antibiotics (e.g. teicoplainin) ; and (4) new derivatives of previous undeveloped narrow spectrum antibiotics (e.g. streptogramins). In addition, many antibiotics are used commercially, or are potentially useful in medicine for purposes other than their antimicrobial action. They are used as anti-tumour agents, enzyme inhibitors including powerful hypocholesterolemic agents, immunosuppressive agents, antimigraine agents, and so on. A number of these products were first discovered as antibiotics that failed in their development as such, or as mycotoxins.
It is unfortunate that the pharmaceutical industry has downgraded natural products 1just at the time that new assays are available and major improvements have been made in detection, characterization, and purification of small molecules. With the advent of combinatorial biosynthesis, thousands of new derivatives can now be made by a biological technique complementary to combinatorial chemistry. New methods are being developed to cultivate the so called unculturable microbes from the soil and the sea. High –throughput screening (HTS) of combinatorial chemicals has not provided the numbers of high- quality leads that were anticipated. It has virtually eliminated the most unique source of chemical diversity, i.e. natural products, from the playing field, in favour of combinatorial chemistry. Combinatorial chemistry mainly yields minor modifications of present day drugs and absolutely requires new scaffolds.
Summary of Chapters
1. INTRODUCTION: Provides an overview of natural product-based drug discovery, the importance of plant-derived medicinal compounds, and introduces Piper nigrum and its active constituent, piperine.
2. LITERATURE SURVEY: Summarizes existing research regarding the chemical, pharmacological, and synthetic studies of piperine and related derivatives.
3. RATIONALE, OBJECTIVES & PLAN OF WORK: Defines the research aim to synthesize improved piperine analogues and outlines the methodology for extraction, computational docking, and synthesis.
4. EXPERIMENTAL WORK: Details the laboratory procedures for phytochemical isolation, computational docking simulations, chemical synthesis of new analogues, and pharmacological animal testing.
5. SUMMARY AND CONCLUSION: Recaps the successful synthesis and characterization of the new analogues and confirms their superior anticonvulsant potency compared to piperine.
Keywords
Piperine, Piper nigrum, CNS Depressants, Anticonvulsant, Semi-synthetic, Docking, Glutamate receptors, Pharmacology, Drug discovery, Phytochemical, Spectroscopy, NMDA, AMPA, Synthetic analogues, Medicinal chemistry.
Frequently Asked Questions
What is the core focus of this research?
The research focuses on investigating the anticonvulsant and CNS depressant properties of piperine, an alkaloid extracted from Piper nigrum, and developing more potent semi-synthetic analogues.
What are the primary thematic fields involved?
The work integrates phytochemistry, computational molecular docking, synthetic medicinal chemistry, and pharmacological evaluation in animal models.
What is the main research objective?
The goal is to synthesize new piperine analogues that exhibit better central nervous system depressant activity than naturally occurring piperine by targeting glutamate receptors.
Which scientific methodology is applied?
The study utilizes a combination of plant extraction (Soxhlet), chromatographic isolation, in-silico docking (Maestro GLIDE), and in-vivo anticonvulsant screening using strychnine-induced convulsion models in mice.
What does the main experimental part cover?
It includes solvent purification, phytochemical isolation, structural elucidation through FT-IR, NMR, and Mass Spectrometry, as well as computational binding studies and synthetic modifications of the piperine scaffold.
What are the key terms associated with this study?
Key terms include Piperine, CNS depressants, anticonvulsant activity, semi-synthesis, molecular docking, and glutamate receptor modulation.
How are the semi-synthetic compounds PIP-2 and PIP-3 synthesized?
They are synthesized by reacting piperine with hydroxylamine hydrochloride and hydrazine hydrate respectively, under reflux conditions with potassium hydroxide in methanol.
What were the major findings regarding the synthetic analogues?
The study concludes that the newly synthesized analogues, PIP-2 and PIP-3, exhibit higher potency and better anticonvulsant protection in mice compared to pure piperine.
- Citation du texte
- Dr. Manik Ghosh (Auteur), Dr. Barij Nayan Sinha (Auteur), Mushtari Akhter (Auteur), 2009, Studies on some semi-synthetic piperine analogous as Central Nervous System Depressants, Munich, GRIN Verlag, https://www.grin.com/document/293986
