scholarly journals Rheological reversibility and long-term stability of repulsive and attractive nanoemulsion gels

RSC Advances ◽  
2017 ◽  
Vol 7 (75) ◽  
pp. 47818-47832 ◽  
Author(s):  
Vivek Vardhan Erramreddy ◽  
Sylvana Tu ◽  
Supratim Ghosh
Keyword(s):  
Storage Modulus ◽  
Canola Oil ◽  
Storage Time ◽  
Term Stability ◽  
Long Term Stability ◽  
Nanoemulsion Gel ◽  
Emulsifier Concentration

The storage modulus (G′) of a canola oil nanoemulsion gel depends on the storage time and SDS emulsifier concentration.

scholarly journals Instability of corticotropin during long-term storage – myth or reality?

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Jacquelien J. Hillebrand ◽  
Li Zhou ◽  
Marilee A. Marcinkus ◽  
Maria Datwyler ◽  
Susan H. Gawel ◽  
...  
Keyword(s):  
Storage Time ◽  
Storage Temperature ◽  
Ethylenediaminetetraacetic Acid ◽  
Venous Blood ◽  
Sampling Studies ◽  
Term Stability ◽  
Long Term Stability ◽  
Long Term Storage ◽  
Term Storage

Abstract Objectives Corticotropin is notorious for its instability. Whereas several studies have investigated its short-term stability in plasma following venous blood sampling, studies on long-term stability are lacking. Here we investigated the long-term storage stability of corticotropin in ethylenediaminetetraacetic acid containing plasma. Methods Specimens from healthy volunteers (neat, spiked) were stored in polypropylene microcentrifuge tubes with socket screw-caps at −20 °C and −70 °C for up to one and a half years. Corticotropin in plasma was measured using an Abbott research only immunoassay. Separately, specimens from patients were collected during diagnostic routine testing and stored in polystyrene tubes with push-caps at −20 °C for up to 6 years. In these samples corticotropin hormone was measured using the Diasorin corticotropin immunoassay. Results Storage of specimens at −20 °C or −70 °C for up to one and a half years showed minimal changes (<11%) in corticotropin levels, while storage of patient samples at −20 °C for up to 6 years showed a significant (54%) reduction in corticotropin levels. Conclusions Corticotropin levels are stable in plasma when stored at −20 °C for one and a half years using the Abbott research only assay, but with longer storage time a significant reduction in corticotropin levels can be expected. Once specimens are stored for future corticotropin measurements, one should consider storage time, storage temperature and assay differences.

Preservation of reverse osmosis membranes with non oxidizing biocides – comparison with SMBS

2011 ◽  
Vol 11 (3) ◽  
pp. 342-351 ◽  
Author(s):  
K. Majamaa ◽  
U. Bertheas ◽  
F. Finlayson ◽  
R. B. Levy
Keyword(s):  
Reverse Osmosis ◽  
Brackish Water ◽  
Storage Time ◽  
Sea Water ◽  
Temperature Dependent ◽  
Current Standard ◽  
Term Stability ◽  
Sodium Metabisulphite ◽  
Long Term Stability

Sodium metabisulphite (SMBS) is the current standard preservation chemical used in RO plants during shut down. It is a cheap and efficient preservative, but its tendency to oxidize easily has several drawbacks. The use of a non-oxidizing biocide instead could solve some of the issues currently seen with the SMBS, but little has been reported about membrane compatibility and preservation efficiency in the long-term mode. Long-term membrane preservation trials have been executed with three different non-oxidizing biocides: DBNPA (2,2-dibromo-3-nitrilopropionamide), CMIT/MIT (5-chloro-2-methyl-4-isothiazolin-3-one (CMIT) and 2-methyl-4-isothiazolin-3-one (MIT), OIT (2-octyl-2H-isothiazol-3-one) as well as SMBS as the reference chemical. The suitability of these chemicals in this application was confirmed using both new Brackish Water Reverse Osmosis (BWRO) and used membranes with various membrane chemistries (Nanofiltration (NF), BWRO, Sea Water Reverse Osmosis (SWRO)). The preservation trial with new membranes confirmed the long-term stability of the product when stored in the biocide solution while the trial with used elements is closer to realistic plant conditions and validated the efficiency of the biocide against biofouling in the long-term. These results show that the biocides can be equivalent preservatives to SMBS and that the application is economically feasible. The used active concentrations for biocides are storage time and temperature dependent and this should be taken into account when first applying them in the field.

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