Enzyme Purification
Enzyme Purification - Related Videos
06:45
Affinity Purification of a Fibrinolytic Enzyme from Sipunculus nudus
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Cited by 2 •
2023
Here, we present an affinity purification method of a fibrinolytic enzyme from Sipunculus nudus that is simple, inexpensive, and efficient.
02:34
Enzymes
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2020
Inside living organisms, enzymes act as catalysts for many biochemical reactions involved in cellular metabolism. The role of enzymes is to reduce the activation energies of biochemical reactions by forming complexes with its substrates. The lowering of activation energies favor an increase in the rates of biochemical reactions. Enzyme deficiencies can often translate into life-threatening diseases. For example, a genetic abnormality resulting in the deficiency of the enzyme G6PD...
08:16
Plasmid Purification
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2023
Plasmid purification is a technique used to isolate and purify plasmid DNA from genomic DNA, proteins, ribosomes, and the bacterial cell wall. A plasmid is a small, circular, double-stranded DNA that is used as a carrier of specific DNA molecules. When introduced into a host organism via transformation, a plasmid will be replicated, creating numerous copies of the DNA fragment under study. In this video, a step-by-step generalized procedure is described for how to perform plasmid purification.
06:30
Gel Purification
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2023
Gel purification is used to recover DNA fragments after electrophoretic separation. DNA recovery from an agarose gel includes three basic steps: binding, washing and eluting from a silica column. DNA is believed to bind to silica in the presence of high salt via a salt bridge. Following binding, DNA is washed of impurities and eluted under low salt conditions disrupting this interaction. This video goes through a step-by-step, generalized procedure for cutting out a band from the gel, gel...
04:35
Enzyme Activity - Concepts
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2019
Biological Catalysts All living organisms continuously perform numerous biochemical reactions to sustain their presence. Most of these reactions require an input of energy to start, which is called the activation energy. Catalysts are chemicals that lower the activation energy. Even though catalysts facilitate a chemical reaction, they are not consumed by it. This means a catalyst can facilitate a specific chemical reaction over and over in succession, increasing the rate of that reaction.
FAQs
Each step targets a different molecular distinction because biological mixtures contain proteins that may resemble the target in one property but differ in another. Precipitation can exploit solubility, centrifugation separates resulting fractions, dialysis helps remove smaller dissolved components, and chromatography can distinguish molecules by charge, size, or affinity. Combining these operations progressively enriches the target while limiting reliance on a single criterion.
Activity assays reveal whether collected fractions still perform the enzyme’s function, whereas protein measurements indicate how much protein each fraction contains. Considering both signals helps distinguish a fraction rich in total protein from one enriched in functional target enzyme. This comparison supports informed fraction selection and helps detect losses of functional state during processing.
Yield measures how much target enzyme is recovered, purity reflects removal of contaminating proteins, and specific activity relates enzyme activity to the amount of protein present. Improving one measure can affect the others, so researchers use all three to judge whether an additional separation step is worthwhile. The goal is a useful balance between recovery, cleanliness, and preserved function.
A typical workflow applies separation operations in sequence, beginning with a complex biological mixture and collecting fractions after each treatment. Precipitation and centrifugation can provide an initial separation, followed by dialysis and chromatography for further refinement. Researchers measure protein content and enzyme activity across fractions, retain the most informative material, and evaluate yield, purity, and specific activity as processing continues.
Chromatography becomes valuable when earlier operations have enriched but not sufficiently resolved the target enzyme. Its separation can be based on molecular characteristics such as charge, size, or affinity, allowing researchers to refine fractions according to distinctions relevant to the mixture. The resulting material can then support more accurate studies of enzyme properties and activity.
Purified enzymes provide a controlled material for studying properties, activity, and reaction mechanisms without the same complexity of the original mixture. They also support structural analysis, industrial biocatalysis, and drug development. In chemistry, this purified material helps connect molecular characteristics with catalytic behavior, while measured activity and purity indicate whether the preparation is suitable for its intended use.