Phytochemical Screening, Isolation and Antibacterial Evaluation of the Ethyl Acetate Crude Extract of the Root Bark of "Dichapetalum Madagascariense Poir"

Table of Contents

1. CHAPTER ONE INTRODUCTION

1.1 Background

1.2 The Family Dichapetalaceae

1.3 Plant Description

1.4 Classification of Plant

1.5 Plant Distribution

1.6 Ethnobotanical Use of Dichapetalum Madagascariense

1.7 Local Names of Dichapetalum Madagascariense:

1.8 Search for New Antimicrobial Agents

1.9 Some Bacterial Infections

1.9.1 Staphyloccocus Aureus

1.9.2 Pseudomonas Aeruginosa

1.9.3 Klebsiella Pneumoniae

1.9.4 Salmonella Typhi

1.10 Statement of Problem

1.11 Justification of Study

1.12 Aim

1.13 Specific Objectives

2. CHAPTER TWO LITERATURE REVIEW

2.1 Review on Dichapetalum madagacariense

2.2 The Dichapetalin

2.3 Organic Solvents

2.4 Solvents for Extracting Bioactive Compounds

2.5 Phytochemicals

2.5.1 Saponins

2.5.2 Flavonoids

2.5.3 Tannins

2.6 Examples of Phytochemicals Found in Foods and Their Benefits

2.7 Antibacterial Determination

2.7.1 Susceptibility Test

2.8 Agar and Broth Dilution

2.8.1 Well Diffusion Method and Kirby Bauer Disk Diffusion

2.8.2 Gradient Diffusion – The E Test (Epsilometer Test)

3. CHAPTER THREE EXPERIMENTAL PROCEDURE

3.1 METHODS

3.2 Chemicals

3.3 Instrument and Equipment/Glassware

3.4 Sample Collection and Treatment

3.5 Hot Extraction Procedure

3.6 Phytochemical Screening Analysis

3.6.1 Test for Saponins

3.6.2 Test for Phenolic Compounds

3.6.3 Test for Polyuronides

3.6.4 Test for Tannins

3.6.5 Test for Flavonoids

3.6.6 Test for Terpenoids

3.6.7 Test for Phytosterols

3.7 Thin Layer Chromatography

3.8 Column Chromatography

3.9 Antibacterial Susceptibility Test

3.9.1 Preparation of The 0.5 Mcfarland Standard

3.9.2 Inoculation

3.9.3 Media Preparation

3.9.4 Antibacterial Susceptibility Testing On Crude Extract

4. CHAPTER FOUR RESULTS

4.1 Phytochemical Test

4.2 Discussion

5. CHAPTER FIVE CONCLUSION AND RECOMMENDATION

5.1 Conclusion

5.2 Recommendations

Research Goal and Thematic Focus

The primary aim of this dissertation is to isolate active chemical compounds from the root bark of the plant Dichapetalum madagascariense and to evaluate the antibacterial efficacy of the ethyl acetate crude extract against specific bacterial strains to address the challenge of antibiotic resistance.

• Phytochemical screening to identify secondary metabolites in root extracts
• Isolation of components using Thin Layer Chromatography (TLC) and column chromatography
• Evaluation of antibacterial activity using the agar well diffusion method
• Comparative analysis of inhibitory effects against Gram-positive and Gram-negative bacteria
• Assessment of bioactive constituents relative to standard antibiotics

Extract from the Book

Summary of Chapters

CHAPTER ONE INTRODUCTION: This chapter provides the background on medicinal plants, their ethnobotanical importance in African traditional medicine, and the growing public health problem of antibiotic-resistant bacterial infections.

CHAPTER TWO LITERATURE REVIEW: The section covers existing knowledge on the Dichapetalum genus, specifically D. madagascariense, its chemical constituents like dichapetalins, and the methodology of phytochemical screening and antibacterial testing.

CHAPTER THREE EXPERIMENTAL PROCEDURE: This chapter details the laboratory steps taken, including sample collection, extraction methods using Soxhlet, phytochemical tests, chromatographic separation, and the protocols for bacterial susceptibility testing.

CHAPTER FOUR RESULTS: This section presents the empirical data gathered from phytochemical screening and the measured zones of inhibition for the crude extracts against test microorganisms compared to positive controls.

CHAPTER FIVE CONCLUSION AND RECOMMENDATION: The final chapter summarizes the research findings regarding the antibacterial activity of the plant extract and offers suggestions for future spectroscopic analysis and further clinical research on isolated compounds.

Keywords

Dichapetalum madagascariense, Antibacterial activity, Phytochemical screening, Soxhlet extraction, Antibiotic resistance, Thin Layer Chromatography, Column chromatography, Ethyl acetate extract, Staphylococcus aureus, Pseudomonas aeruginosa, Secondary metabolites, Medicinal plants, Antimicrobial agents, Agar well diffusion, Bacterial inhibition

Frequently Asked Questions

What is the core focus of this research?

The research focuses on the scientific evaluation of the roots of the medicinal plant Dichapetalum madagascariense to determine if its chemical constituents possess antibacterial properties, offering potential alternatives to traditional antibiotics.

What are the primary themes discussed in this study?

The work covers ethnobotany, secondary metabolites (such as tannins, phenolics, and triterpenoids), advanced laboratory extraction techniques, and the modern clinical crisis of antimicrobial resistance.

What is the main research objective?

The objective is to isolate bioactive compounds from the ethyl acetate root extract of the plant and to quantitatively determine its inhibitory effect against selected pathogenic bacteria.

Which scientific methods were employed?

The methodology includes Soxhlet extraction, phytochemical screening for various chemical classes, chromatographic separation (TLC and column), and the agar well diffusion method for testing susceptibility.

What is specifically covered in the experimental section?

The experimental section details the preparation of the root powder, the utilization of solvents of different polarities, the specific reagents used for chemical tests, and the procedural standardization for inoculating bacterial culture media.

Which keywords characterize this paper?

Key terms include Dichapetalum madagascariense, antibacterial evaluation, phytochemical screening, Soxhlet extraction, and antibiotic resistance testing.

How effective was the plant extract against the tested bacteria?

The study found the ethyl acetate extract to be effective against Staphylococcus aureus and Pseudomonas aeruginosa, exhibiting varied zones of inhibition, but noted it was ineffective against Escherichia coli.

How did the control samples compare to the plant extract?

The extract showed appreciable inhibitory activity comparable to some standard antibiotics used as positive controls, while negative controls (DMSO and ethyl acetate) showed no activity, confirming the plant's efficacy.