Purification and characterization of pyomelanin from Pseudomonas aeruginosa.
Journal name: World Journal of Pharmaceutical Research
Original article title: Purification and physiochemical characterization of pyomelanin pigment produced from local pseudomonas aeruginosa isolates
The WJPR includes peer-reviewed publications such as scientific research papers, reports, review articles, company news, thesis reports and case studies in areas of Biology, Pharmaceutical industries and Chemical technology while incorporating ancient fields of knowledge such combining Ayurveda with scientific data.
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Huda M. Mahmood, Alaa K. Mohammed, May T. A Flayyih
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Full text available for: Purification and physiochemical characterization of pyomelanin pigment produced from local pseudomonas aeruginosa isolates
Source type: An International Peer Reviewed Journal for Pharmaceutical and Medical and Scientific Research
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Summary of article contents:
Introduction
This study focuses on the purification and physicochemical characterization of pyomelanin pigment produced by local isolates of Pseudomonas aeruginosa. Pyomelanins, high molecular weight pigments formed through the oxidative polymerization of phenolic or indolic compounds, are typically dark brown or black and can be found in various organisms from microorganisms to humans. While much about pyomelanins remains unclear, their unique properties and potential applications in various industries have sparked renewed interest in their study. The researchers aimed to characterize eight pyomelanoenic isolates collected from various human clinical samples and to confirm the structure of the isolated pyomelanin.
Characterization of Pseudomonas aeruginosa Isolates
Among the 143 specimens collected from patients in Iraqi hospitals, eight isolates capable of producing pyomelanin were identified as Pseudomonas aeruginosa. Identification was based on morphological, cultural, biochemical characteristics, VITEK-2 assessment, and 16S rRNA sequencing. Notably, the study found that a sputum isolate from a cystic fibrosis patient exhibited the highest production of pyomelanin. Using L-tyrosine as a substrate in the production medium, the isolates displayed effective growth and significant pigment production, indicating a direct correlation between substrate availability and pigment synthesis.
Extraction and Purification Process
The extraction and purification of pyomelanin were accomplished using a two-step process involving acid precipitation followed by centrifugation. The pigment was obtained after acidifying the bacterial culture and boiling the resultant suspension to prevent melanoidin formation. The study confirmed that the isolated pigment was pyomelanin through qualitative chemical tests. The successful extraction highlighted the ease and cost-effectiveness of the method, indicating it could be advantageous for future research or industrial applications in extracting natural pigments.
Physicochemical Characterization
The physicochemical characterization of the isolated pyomelanin involved multiple analytical techniques, including UV-Visible spectrophotometry, Fourier transform infrared (FT-IR) spectroscopy, and X-ray diffraction (XRD). The UV-Vis analysis indicated distinct absorption peaks characteristic of melanin, and FT-IR spectra confirmed the presence of hydroxyl and carbonyl functional groups typically associated with pyomelanin. XRD analysis revealed the amorphous nature of the pyomelanin, differentiating it from crystalline pigments. These analyses provided significant insights into the structural features and chemical properties of the produced pyomelanin, demonstrating its potential applicability.
Conclusion
This study represents the first report on the screening and characterization of pyomelanogenic local Pseudomonas aeruginosa isolates and their produced pigment. The successful extraction and detailed physicochemical characterization enhance our understanding of pyomelanin's properties and may encourage future research into its applications in pharmaceuticals, cosmetics, and natural dye industries. With the increasing demand for natural alternative pigments, the findings of this study could pave the way for exploiting pyomelanin as a valuable biopolymer in various fields.
FAQ section (important questions/answers):
What is pyomelanin and how is it formed?
Pyomelanin is a high molecular weight pigment formed by the oxidative polymerization of phenolic or indolic compounds, typically appearing dark brown or black. It can be produced by various organisms, including bacteria.
How were Pseudomonas aeruginosa isolates identified in the study?
The isolates were identified through morphological, cultural, biochemical characteristics, and molecular techniques including VITEK-2 and 16S rRNA sequencing.
What method was used to extract pyomelanin from the isolates?
Pyomelanin was extracted through a process involving acidification with 1 N HCl, followed by centrifugation and washing steps to purify the black pigment for analysis.
What were the key analytical techniques used for characterizing pyomelanin?
Key techniques included UV-Vis spectroscopy, Fourier Transform Infrared (FT-IR) spectroscopy, and X-Ray Diffraction (XRD) to analyze the chemical and structural properties of the extracted pigment.
What were the main findings related to the solubility of pyomelanin?
Pyomelanin was readily soluble in distilled water, phenol, KOH, and NaOH, while being insoluble in various organic solvents, indicating its distinct chemical properties.
Why is there interest in using pyomelanin in industries?
There is growing interest in natural dyes and pigments like pyomelanin in food, cosmetic, and pharmaceutical industries, as synthetic pigments are often viewed as harmful or carcinogenic.
Glossary definitions and references:
Scientific and Ayurvedic Glossary list for “Purification and characterization of pyomelanin from Pseudomonas aeruginosa.”. This list explains important keywords that occur in this article and links it to the glossary for a better understanding of that concept in the context of Ayurveda and other topics.
1) Purification:
Purification refers to the process of isolating the pyomelanin pigment from the bacterial cells and their metabolic by-products. This step is crucial in the study as it ensures the integrity and quality of the pigment, allowing for more accurate characterization and analysis of its properties and potential applications.
2) Medium:
In the context of this study, medium refers to the specific growing environment (L-tyrosine agar plates) used for culturing the Pseudomonas aeruginosa bacteria. The medium provides essential nutrients that enable bacterial growth and pyomelanin production, playing a vital role in the screening and characterizing process.
3) Study (Studying):
The study is a systematic investigation aimed at understanding the production and characteristics of pyomelanin from local Pseudomonas aeruginosa isolates. It provides insights into the potential applications of biopigments in various industries and contributes to the broader scientific knowledge regarding microbial pigments and their properties.
4) Science (Scientific):
Science encompasses the systematic study of the natural world, where hypotheses are tested through experimentation and observation. This study falls within the scientific discipline of microbiology and biochemistry, focusing specifically on microbial pigment production and characterization, thereby adding to the knowledge base of natural pigments.
5) Water:
Water is a critical solvent used in the extraction and characterization of pyomelanin pigment. Its properties influence the solubility and stability of the extracted pigment, ensuring accurate assessments during UV-visible spectrophotometry, FT-IR spectroscopy, and other analyses essential for understanding the pigment's characteristics.
6) Transformation (Transform, Transforming):
Transform refers to the process in which absorbed energy is converted, particularly in the context of how pyomelanin converts photon energy into heat. This attribute is significant for understanding the thermal properties of the pigment, which may impact its applications in various fields.
7) Line:
Line in this context refers to the linear relationships observed in the UV absorption spectra of pyomelanin. Such linear behavior is indicative of the molecular characteristics of the pigment, facilitating comparisons with standard synthetic pigments and contributing to its characterization.
8) Burning (Burn, Burned, Burnt):
Burn references the source of clinical samples collected from patients with burns. This aspect of the study highlights the relevance of Pseudomonas aeruginosa in infections associated with burn wounds, underlining the importance of understanding pyomelanin production in this pathogenic context.
9) Al-khowarizmi (Al-khowârîzmî):
Al-Khwarizmi Engineering College is an institution where one of the authors is affiliated. Its association emphasizes the educational and collaborative efforts in advancing scientific research and knowledge generation, particularly in fields related to biochemistry, microbiology, and engineering.
10) Discussion:
Discussion in this study refers to the section where results are interpreted and contextualized. It is critical for analyzing findings, drawing conclusions about pyomelanin characteristics, comparing results with previous studies, and suggesting future directions for research and applications of the pigment.
11) Similarity:
Similarity highlights the comparison between the extracted pyomelanin and synthetic counterparts, particularly through spectroscopic analyses like FT-IR. Recognizing these similarities confirms the identity of the extracted pigment, aiding in establishing its chemical composition and potential applications.
12) Antibiotic (Antibacterial):
Antibiotic refers to the resistance exhibited by Pseudomonas aeruginosa, which is noted for its capacity to withstand various antibiotics. This resistance enhances the relevance of studying pyomelanin as it may play a role in the bacterium's survival and virulence, impacting treatment strategies.
13) Nature:
Nature signifies the inherent qualities and characteristics of pyomelanin, as a product of microbial metabolism. Understanding the natural properties of this pigment is essential for exploring its functionalities and applications in industries such as cosmetics, food, and medicine.
14) Reason:
Reason refers to the justification behind the study's focus on natural pigments. The growing consumer demand for natural alternatives to synthetic dyes stems from concerns over health and safety, making the exploration of pyomelanin's properties particularly relevant in today's market.
15) Powder:
Powder pertains to the physical form of the purified pyomelanin pigment, which is created during the extraction process. The powdered form is significant for further analyses, including spectroscopy and XRD, as it allows for easier handling and application in various tests.
16) Glass:
Glass is utilized in laboratory settings for containing and processing substances, specifically during spectroscopic analyses where vials or cuvettes are often made of glass. Its properties ensure that reactions and measurements are not interfered with, maintaining the accuracy of analytical results.
17) Santha (Śaṇṭha, Saṃtha, Ṣaṇṭha, Sanṭha, Shantha, Santh):
Santh refers to the specific supplier (Sigma, St. Louis) of synthetic pyomelanin used as a comparison standard in the study. This association aids in validating the characteristics of the extracted pigment by providing a reliable benchmark for comparison in various analyses.
18) Food:
Food highlights one of the potential applications of pyomelanin as a natural pigment. As the demand for natural food additives increases, understanding the properties and benefits of biopigments like pyomelanin becomes essential for developing safe and appealing food products.
Other Science Concepts:
Discover the significance of concepts within the article: ‘Purification and characterization of pyomelanin from Pseudomonas aeruginosa.’. Further sources in the context of Science might help you critically compare this page with similair documents:
X-ray diffraction, Pseudomonas aeruginosa, Fourier transform infrared spectroscopy, Chemical structure, Melanogenesis, Melanin pigment, Physico-chemical tests, Organic solvent, Extraction and purification, Morphological characteristic, UV–VIS Absorption Spectra, Physico-chemical characterization, Cystic fibrosis, High molecular weight, UV-Visible Spectroscopic Analysis, Acid precipitation, Klebsiella sp., Clinical sample, Synthetic pigments, Melanin biosynthesis, ABC transporter, DILUTION, Cystic fibrosis patients, Fungal melanins, Marine fungus, Biochemical Characteristic.