Generally, serum samples for clinical chemistry analysis are refrigerated (2 to 8 °C) or frozen (−10 to −20 °C) for short-term durations and stored at −70 °C for long periods.

How long can serum samples be frozen?

Frozen samples are stable for 3 months and should be thawed only once. Analyte deterioration may occur in samples that are repeatedly frozen and thawed.

What temperature should protein samples be stored at?

Generally, proteins should be stored at ≤4°C in clean, autoclaved glassware or polypropylene tubes. Storage at room temperature often leads to protein degradation and/or inactivity, commonly as a result of microbial growth.

Why should protein samples be kept at cold temperatures?

While working with proteins in the lab, they should be kept on ice. Since proteins are generally more stable at colder temperatures, maintenance at low temperatures even for short duration is recommended. Addition of stabilizers such as glycerol helps prevent damage to the protein during freezing and thawing.

Why is serum frozen and not stored in the refrigerator?

Multiple thaw/freeze cycles should be avoided as they will hasten the degradation of serum nutrients and can induce the formation of insoluble precipitates. For this reason, serum should never be stored in “frost-free” freezers.

Why would serum not freeze?

In case of plasma or serum, pure solvent is water and all mineral and organic components of plasma/serum are solutes. The more particles of solutes are in a solution, the lower is the freezing point of a solution relative to the pure solvent.

How long can you store serum at?

Liquid serum may be stored refrigerated (2 to 8 °C) up to four weeks. To avoid thaw/freeze cycles or long periods of refrigeration, it is recommended that any unused serum be immediately dispensed into small, useful aliquots and refrozen for future use.

How do you thaw frozen serum?

Procedure

1. Fill the water-bath with sufficient water so that the product is immersed near the serum level.
2. Place each bottle in 37° water bath.
3. Gently swirl or shake the bottles every 10 minutes until the serum is completely thawed, or use a shaking water bath to agitate the serum while thawing.

Is it OK to freeze protein?

Can you freeze protein powder…. Yes. The protein in protein powder is not damaged by freezing it, but protein powder does not respond well to moisture. Taking a container in and our of a fridge or freezer can cause condensation on the inside of your storage container, which can then ruin your powder.

Does freezing destroy protein?

Answer: not really. “You shouldn’t worry about losing nutrients from freezing a smoothie or protein powder and water,” Sumbal says. “Freezing overnight should keep the protein intact, but be sure to mix completely before freezing so you have a well-mixed drink when you thaw it out in the fridge,” she adds.

What happens when you freeze proteins?

But the fact is, freezing, long-term storage and even freeze-thaw cycles can cause loss of functional properties and conformational changes of proteins. This phenomena — known as freeze concentration — can cause high salt or protein concentrations in the aqueous phase, causing severe stress to protein stability.

Can you freeze and thaw serum?

1. Remove the serum from frozen storage and thaw in a water bath with temperatures ranging from room temperature to 37 °C. Note: Frozen serum should be thawed rapidly to avoid prolonged exposure of serum nutrients to higher salt concentrations during the thaw period.

Do storage time and freeze-thaw cycles affect the stability of serum analytes?

The effect of storage time and freeze-thaw cycles on the stability of serum samples As a result, common clinical chemistry analytes, with considering the variability of unstable analytes, showed adequote stability after 3 months of storage in sera at -20 degrees C, or up to ten times of freeze-thaw cycle.

How long can Sera be kept frozen before analysis?

A group of sera were kept frozen for up to 1, 2 and 3 months and then analyzed for stability. The other experiment consisted of one to ten times of freeze and thaw cycles. Total of 17 chemistry analytes were assayed at each time point. The results were compared with those obtained from the initial analysis of fresh samples.

What is the best way to store serum samples?

Materials and methods: Serum samples were obtained from 15 patients. Following baseline measurement, sera of each subject were aliquoted and stored at -20 degrees C for two experiments. A group of sera were kept frozen for up to 1, 2 and 3 months and then analyzed for stability.

What causes low protein and albumin in blood test?

You may have underlying health problems if the blood test reveals low levels of protein and albumin. There are various factors that cause low protein in the blood and the remedies vary depending on the underlying condition. 1. Kidney Disease: Kidney diseases such as Nephrotic Syndrome cause loss of protein from the body through urine.