Date Fruit Melanin Electrodes via pH-Controlled Extraction
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Solution Overview
Problem
Melanin obtained from natural sources is insoluble, limiting its use in electrical, optical, and biological applications, necessitating the development of a simpler extraction method that retains electrical and conductive properties.
Innovation Solution
A method involving alkaline extraction of melanin from date fruit followed by acid precipitation, yielding a soluble form suitable for use in electronic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If melanin is obtained from natural sources, then it retains its electrical and conductive properties, but it is insoluble which limits its usage in electrical applications
Solution Approach 1:
The patent applies parameter changes by modifying the chemical environment (pH) to transform melanin from an insoluble state at neutral pH to a soluble state in alkaline conditions, then precipitating it in a controlled manner to retain conductivity while achieving solubility for processing
Solution Approach 2:
The patent uses an intermediary approach by introducing alkaline agents (NaOH, KOH, NH4OH) as mediators to solubilize melanin temporarily during extraction, allowing it to be processed and then precipitated back to its conductive form, thus bridging the gap between insolubility and processability
2Quantity of substance
If conventional extraction methods are used, then melanin can be obtained, but the extraction process is complex and not simpler
Solution Approach 1:
The patent applies the extraction principle by selectively removing melanin from date fruit using simple alkaline solutions, separating it from other fruit components through straightforward filtration and precipitation steps, achieving high yield with minimal processing complexity
Solution Approach 2:
The patent simplifies the extraction process by utilizing parameter changes (pH adjustment) to control melanin solubility, allowing for easy separation and purification through simple filtration and acidification steps rather than complex multi-stage processes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The extracted melanin exhibits high conductivity, electron mobility, and material permittivity, making it suitable for use in electronic components such as sensors and photovoltaic cells.
Implementation Method 1
The step of alkaline extraction of crude melanin comprises mixing the date fruit puree with sodium hydroxide. Melanin is soluble in an alkaline solution. Upon mixing, the melanin from the date fruit puree is solubilized into the alkaline solution.
Implementation Method 2
The method further comprising precipitating the crude melanin by mixing the supernatant with an inorganic acid. The inorganic acid may be selected from hydrochloric acid, sulphuric acid and nitric acid.
Implementation Method 3
The method further comprises centrifuging the alkaline solution and separating the supernatant from the precipitate. The supernatant comprises crude melanin.
Data Source
AI summary
A process of extracting date fruit melanin from the date fruit for use in electrical application comprising providing a date fruit puree, mixing the puree with an alkaline solution to solubilize melanin, followed by acid precipitation of melanin using an inorganic acid. The melanin obtained finds its use as an electrically conductive portion in an electronic component of devices comprising of a sensor, a photovoltaic cell and/or bioelectronic device.