Grape Seed Tannin Extraction Yield via Single-Step Solubilisation
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Solution Overview
Problem
Current tannin extraction technologies face challenges in scalability, efficiency, and environmental sustainability, particularly in the tanning industry, as they require multiple extraction steps, filtration, and the use of non-renewable resources, resulting in low yields and high energy consumption.
Innovation Solution
An aqueous extraction process using grape seeds as the source of tannins and urea or sodium hydroxide as polyphenol-solubilising agents in an autoclave at controlled pressure and temperature, eliminating the need for filtration and purification steps, and allowing for high-yield, single-step extraction of tannin extracts with improved antioxidant and light fastness properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple extraction steps, filtration and purification are used, then tannin extraction yield is improved, but process complexity and energy consumption increase
Solution Approach 1:
The patent combines multiple extraction steps into a single extraction operation by using ground grape seeds mixed with water and a solubilising agent. The solid-liquid separation, filtration, and concentration steps are integrated into one continuous process flow, eliminating the need for separate filtration and purification operations while maintaining high extraction yield.
Solution Approach 2:
The patent extracts only the essential components (tannins and non-tannins) from grape seeds through a simplified single-step extraction process, separating them directly from the solid grape seed material. This extraction approach eliminates the need for multiple sequential extraction steps and complex purification operations.
2Productivity
If multiple extraction steps, filtration and purification are used, then tannin extraction yield is improved, but energy consumption increases
Solution Approach 1:
The patent combines multiple extraction steps into a single extraction operation by using ground grape seeds mixed with water and a solubilising agent. The solid-liquid separation, filtration, and concentration steps are integrated into one continuous process flow, eliminating the need for separate filtration and purification operations while maintaining high extraction yield.
3Ease of operation
If conventional aqueous extraction is used, then process simplicity is improved, but tannin yield and extract quality are insufficient
Solution Approach 1:
The patent introduces a solubilising agent as an intermediary substance that facilitates the extraction of tannins and non-tannins from ground grape seeds. This agent enhances the solubility and extraction efficiency of polyphenolic compounds in aqueous medium, thereby improving extraction yield while maintaining process simplicity.
Solution Approach 2:
The patent modifies extraction parameters by using ground grape seeds instead of whole seeds, and by adjusting the composition of the extraction medium to include a solubilising agent. These parameter changes significantly improve tannin extraction yield and extract quality while keeping the process simple and scalable.
4Productivity
If ground grape pomace is used as tannin source, then extraction efficiency is improved, but additional filtration and pressing steps are required
Solution Approach 1:
The patent combines multiple extraction steps into a single extraction operation by using ground grape seeds mixed with water and a solubilising agent. The solid-liquid separation, filtration, and concentration steps are integrated into one continuous process flow, eliminating the need for separate filtration and purification operations while maintaining high extraction yield.
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 process achieves high tannin yields (up to 80.3%), reduces energy consumption, and produces a tannin extract suitable for industrial use with enhanced antioxidant and light stability, while being environmentally friendly and scalable, with the added benefit of incorporating a colouring agent.
Implementation Method 1
preparing an aqueous solution of a polyphenol-solubilising agent... in order to extract the tannins
Implementation Method 2
extraction step in a reactor that comprises the source of tannins and the previously-prepared aqueous solution at a given pressure and temperature
Implementation Method 3
extraction step in a reactor that comprises the source of tannins and the previously-prepared aqueous solution at a given pressure and temperature
Data Source
AI summary
A process for obtaining a tannin extract isolated from whole grape seeds is provided. The process is performed in as a one-pot reaction and in a single extraction step, wherein the seeds are processed without grinding or milling. Also provided is a tannin extract with improved antioxidant and light fastness properties obtained from whole grape seeds that includes a mixture of tannins and non-tannins, in which the content of tannins or polyphenols is higher than 50%. Ise, the tannin extract isolated from whole grape seeds can include a coloring agent.