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Optimizing growth media enhances microbial proliferation and maximizes product yield. Statistical experimental design methodologies provide structured and reproducible approaches, offering progressively higher levels of robustness and efficiency.The One-Factor-at-a-Time (OFAT) MethodThe One-Factor-at-a-Time (OFAT) method involves adjusting a single variable while keeping all others constant. However, it cannot detect interactions between variables, often leading to suboptimal outcomes when...

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Early Detection of Cyanobacterial Blooms and Associated Cyanotoxins using Fast Detection Strategy

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Cyanobacterial Polyhydroxybutyrate (PHB): Screening, Optimization and Characterization.

Sabbir Ansari¹, Tasneem Fatma¹

¹Cyanobacterial Biotechnology Laboratory, Department of Biosciences, Jamia Millia Islamia (Central University), New Delhi, India.

|July 1, 2016

Summary

This study screened cyanobacteria for polyhydroxybutyrate (PHB) production, identifying Nostoc muscorum NCCU-442 as a high producer. Optimized conditions significantly increased PHB yield, demonstrating its potential as a biodegradable plastic alternative.

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Area of Science:

Microbiology
Biotechnology
Polymer Science

Background:

Petroleum-based plastics cause significant environmental pollution.
Biodegradable plastics (bioplastics) offer a sustainable alternative.
Polyhydroxybutyrate (PHB), a microbial polyester, is a promising bioplastic candidate.

Purpose of the Study:

To screen cyanobacterial strains for Polyhydroxybutyrate (PHB) production.
To optimize extraction and production conditions for PHB.
To characterize the properties and biodegradability of the produced PHB.

Main Methods:

Screening of 23 cyanobacterial strains for PHB production.
Microscopic confirmation (Sudan black B, Nile red A) and chemical identification (FTIR, 1H NMR, GC-MS) of PHB.
Optimization of extraction (solvent mixture, time) and production (pH, temperature, light, nutrients) conditions.
Thermal analysis (TGA, DSC) and mechanical testing (tensile strength, Young's modulus).
Biodegradability assessment using mixed microbial cultures.

Main Results:

Nostoc muscorum NCCU-442 exhibited the highest PHB production (6.44% w/w).
Optimized conditions yielded 26.37% PHB on day 7, significantly improving yield and reducing production time.
Extracted polymer confirmed as PHB with comparable mechanical properties to petrochemical plastics.
Efficient biodegradation (24.58% weight loss in 60 days) was observed.

Conclusions:

Cyanobacteria, particularly Nostoc muscorum NCCU-442, are viable sources for PHB production.
Optimized conditions significantly enhance PHB yield and shorten production cycles.
The produced PHB demonstrates suitable properties and biodegradability for potential use as a sustainable plastic alternative.