What is the precipitate in the PETG media bottle?

Fri Feb 17 11:16:32 CST 2023

PETG media bottle is a special packaging container for storing serum. Sometimes we find some sediment inside the bottle, so what exactly are these sediments?

These substances are mainly calcium phosphate or fibrin.

1. Calcium phosphate

A common sediment that appears as a cloud. Observing through an inverted microscope, you will find many small black spots in the PETG media bottle. These black spots are free to move due to Brownian motion and are therefore often mistaken for microbial contamination. A small amount of precipitation is a normal phenomenon during the thawing process of serum. Too clear serum does not represent higher quality, and it may also be the result of repeated freezing and thawing during processing to remove fibrinogen as much as possible.

125ml Square PETG Media Bottles125ml-Square-PETG-PET-Media-Bottles

2. Fibrin

Larger material (up to 1-2 mm) visible to the naked eye. Serum is collected at low temperatures and processed rapidly, resulting in some fibrinogen remaining in solution. Although most of the fibrin is removed by filtration, during the thawing process, the fibrinogen will be converted into fibrin again and precipitated, forming a precipitate.

Although precipitation in serum is difficult to predict and prevent, reasonable and correct storage and use methods can reduce the precipitation of precipitation in serum, and centrifugation can also be used to remove sediment in PETG media bottle.

The FAI climbed 5.9 percent year-on-year in the first 11 months of 2018, quickening from the 5.7-percent growth in Jan-Oct, the National Bureau of Statistics (NBS) said Friday in an online statement.

The key indicator of investment, dubbed a major growth driver, hit the bottom in August and has since started to rebound steadily.

In the face of emerging economic challenges home and abroad, China has stepped up efforts to stabilize investment, in particular rolling out measures to motivate private investors and channel funds into infrastructure.

Friday's data showed private investment, accounting for more than 60 percent of the total FAI, expanded by a brisk 8.7 percent.

NBS spokesperson Mao Shengyong said funds into weak economic links registered rapid increases as investment in environmental protection and agriculture jumped 42 percent and 12.5 percent respectively, much faster than the average.

In breakdown, investment in high-tech and equipment manufacturing remained vigorous with 16.1-percent and 11.6-percent increases respectively in the first 11 months. Infrastructure investment gained 3.7 percent, staying flat. Investment in property development rose 9.7 percent, also unchanged.