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Under BP2 method, several specimens out of ten specimens resulted the A260/A280 nm ratio as less than 1.8 that indicates protein contamination or presence of organic contaminants, such as phenol, and other aromatic compounds.
Production could be limited by the amount of raw material available and the product potentially carries the risk of shellfish protein contamination.
The DGAT1 was eluted with 500 mmol/L imidazole with no detectable cytosolic protein contamination.
EVs isolated by PROSPR have only ~20% as much protein contamination than those isolated by U/C.
This study shows DNA purity to fall outside that range possibly because protein contamination might have occurred during the isolation of the DNA sample.
Protein contamination would have caused low A260/A280 ratios (Wilfinger et al. 2006), which were not observed in the present study.
The stock solution of CT DNA gave a ratio of UV absorbance at 260 and 280 nm (A260/A280) of 1.89, indicating that the DNA was sufficiently free of protein contamination.
Density gradient U/C suffers less from protein contamination (only 5 25% of EV concentration) than differential U/C because proteins are accumulated into different layers of density than EVs [40, 60].
The absorbance ratios; A260/280 nm and A260/230 nm were measured to assess DNA purity: A260/280 nm for protein contamination and A260/230 nm for salt and phenol contamination.
As for the latest known death, Pret A Manger blamed its dairy-free yogurt supplier, CoYo, for the dairy protein contamination.
These HA preparations are free of protein contamination.
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