Pectin Content Determination via Acidic Alcohol and Enzymatic Hydrolysis
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Solution Overview
Problem
Current methods for determining pectin content in plant samples, such as the chromogenic method, face interference from pigments and sugars, and the ethanol treatment method is limited in sugar and pigment removal, leading to inaccurate results and overestimation of galacturonic acid content.
Innovation Solution
A method involving acidic alcohol treatment, followed by acid soaking and pectinase treatment, with subsequent enzymatic hydrolysis and continuous flow analysis using a strong-acid decomposing reagent and chromogenic reaction, to accurately determine pectin content by converting pectin into chromogenic derivatives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If ethanol treatment method is used for pre-treatment, then water-soluble sugars can be removed, but pigment extraction is limited and the process requires additional acid solution treatment which causes polysaccharide hydrolysis and cell wall breakdown
Solution Approach 1:
The patent combines sugar removal and pigment extraction into a single acidic alcohol solution treatment step. The acidic alcohol solution simultaneously achieves both functions that previously required separate ethanol treatment and acid solution treatment steps, thereby simplifying the overall pre-treatment process while maintaining effective sugar and pigment removal.
Solution Approach 2:
The acidic alcohol solution serves multiple functions: it acts as both the ethanol treatment reagent for sugar removal and the acid solution for pigment extraction. This multi-functional reagent eliminates the need for sequential separate treatments and avoids the harmful effects of strong acid on polysaccharides and cell walls.
2Quantity of substance
If gravimetric method is used for determination, then total polysaccharide content can be measured, but neutral sugars, rhamnoses, methylated groups and acetylated groups are simultaneously precipitated causing overestimation of galacturonic acid content
Solution Approach 1:
The patent uses enzymatic treatment with pectinase to specifically extract and hydrolyze pectin into its constituent galacturonic acid monomers. This selective extraction separates pectin from other polysaccharides and components, allowing the subsequent chromogenic method to specifically measure galacturonic acid content without interference from neutral sugars, rhamnoses, or other groups that would be precipitated in gravimetric analysis.
Solution Approach 2:
The patent replaces the mechanical gravimetric method with an enzymatic-chromogenic approach. Instead of measuring total precipitated material gravimetrically, the method uses pectinase enzymatic hydrolysis followed by chromogenic reaction specific to galacturonic acid, enabling selective and accurate measurement of pectin content without co-precipitation of other substances.
3Quantity of substance
If acid solution is used for residue treatment, then pigment can be extracted, but polysaccharides are hydrolyzed and cell walls are broken causing previously dissolved pigment to be extracted and influencing final determination results
Solution Approach 1:
The patent changes the parameters of the treatment solution from strong acid to acidic alcohol solution with controlled hydrogen ion concentration (0.005-0.02 mol/L). This parameter modification allows sufficient pigment extraction while maintaining the integrity of polysaccharides and cell walls, preventing hydrolysis and避免因细胞壁破裂导致的色素重新释放，从而保证测定结果的准确性.
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
This method provides a more accurate and efficient determination of pectin content by effectively removing sugars and pigments, reducing interference, and specifically measuring galacturonic acid content, thus overcoming the limitations of existing methods.
Implementation Method 1
adding an acidic alcohol solution to the plant sample, followed by a heating in a water bath
Implementation Method 2
adding a pectinase solution and heating the resulting mixture under vibration in a water bath
Implementation Method 3
adding a pectinase solution and heating the resulting mixture under vibration in a water bath
Implementation Method 4
the test solution is reacted with a strong-acid decomposing reagent drawn into the continuous flow analyzer, to form furfurine derivatives
Implementation Method 5
which is further reacted with an chromogenic reagent, followed by a determination under a wavelength of 490 - 540 nm
Data Source
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AI summary
Disclosed is a method for determining pectin content in a plant sample, comprising the following steps: 1) adding an acidic alcohol solution to the plant sample, then heating the resulting mixture to reflux in a water bath, followed by a first filtration; 2) soaking the filtered residue obtained from the first filtration with an acidic solution, then heating the resulting mixture to reflux in a water bath, followed by a second filtration, then bringing to volume after cooling, obtaining filtrate for later use; 3) adding an acetic acid/sodium acetate buffer solution to treat the filtered residue obtained from the second filtration, then adding a pectinase solution and heating the resulting mixture under vibration in a water bath, followed by a third filtration to obtain a filtrate for later use; 4) sequentially adding an acetic acid/sodium acetate buffer solution and a pectinase solution to the filtrate obtained in step 2) and heating the resulting mixture under vibration in a water bath to obtain an enzymatic hydrolysate, then adding the filtrate obtained in step 3) to the enzymatic hydrolysate followed by bringing to volume, obtaining a test solution; and 5) drawing the test solution into a continuous flow analyzer to perform analysis. The method disclosed has the advantage of providing accurate analysis results.