Method That Can Be Preserved With Filter Paper

It sounds like you’re looking for a method to preserve or store certain compounds or samples using filter paper. Filter paper is commonly used for various preservation and storage purposes in laboratories. Here are a few methods where filter paper can be utilized for preservation:

Drying and Preservation:

After a chemical reaction, you can place filter paper in a funnel or other suitable container to absorb excess solvent, facilitating the drying process. This is particularly useful for compounds sensitive to moisture.

Extraction and Drying:

Filter paper can be used to collect extracted solid compounds after an extraction process, such as liquid-liquid extraction or solid-phase extraction. The filter paper helps remove residual solvent.

Pressing Plant Specimens:

When collecting plant specimens, filter paper can be used to press and dry the samples, preserving their shape and structure for botanical analysis.

Storing Small Solid Samples:

Filter paper can be folded and used to store small solid samples or compounds. This helps keep them separated and prevents cross-contamination.

Sample Preservation in Solution:

Filter paper can be soaked in a preserving solution and used to wrap delicate samples before storage. This method is used in some DNA preservation techniques.

Sample Spotting for TLC or HPLC:

A sample can be spotted onto filter paper and allowed to dry. This dried spot can then be used for thin-layer chromatography (TLC) or high-performance liquid chromatography (HPLC) analysis.

Sample Handling in Gas Chromatography (GC):

Filter paper can be used to create small sample packets to hold volatile samples for gas chromatography analysis.
Remember that the choice of filter paper type (e.g., qualitative, quantitative, or specialized papers) should be considered based on the nature of the sample, the desired preservation method, and the subsequent analytical or storage requirements. Additionally, the filter paper should be stored in a dry and controlled environment to avoid degradation of the stored compounds.

Yeasts and filamentous fungi can be preserved by filter paper

The first two can be preserved for about 2 years, and some filamentous fungi can be preserved for 14 to 17 years. This method is simpler than liquid nitrogen and freeze-drying and does not require special equipment. The filter paper was cut into 0.5 cm³ 1.2 cm strips, placed in a 0.6 cm³ 8 cm ampoule tube, 1~2 sheets per tube, stoppered with a cotton plug, and sterilized at 121 °C for 30 min. The strain to be preserved is cultured on a suitable slant medium and grown sufficiently.

Sterilized degreased milk (treatment of skimmed milk

Degreased by centrifugation at 2000r/min for 10min, then sterilized at 115°C for 20min, or intermittently sterilized 3 times, after sterile inspection) 1~2mL added to the sterilized culture dish or in a test tube, take a few rings of fungus in the milk to make a concentrated suspension.

Use sterile tweezers to take the filter paper from the ampoule tube and immerse it in the bacterial suspension, soak it up, put it back into the ampoule tube, and stuff the cotton plug. The ampoule was placed in a desiccator containing P2O5 as a water-absorbing agent and evacuated by a vacuum pump to dryness. The cotton is stuffed into the tube, sealed with fire, and stored at low temperatures. Need to use the strain, when resurrection culture, the ampoule can be heated on the flame, drop a drop of cold water in the hot part, and the glass will be broken, then use the tweezers to knock off the glass at the mouth. After the ampoule is opened, remove the filter paper, placed it in a liquid medium, and incubated it in a thermostat.

Hawach provides Qualitative 20 Micron Filter Paper Grade: BIO-4, Quantitative Laboratory Filter Paper Grade: BIO-42, Quantitative Cellulose Filter Paper Grade: BIO-44, Wet Strengthened 10 Micron Filter Paper Grade: BIO-91, and other filter papers for your choice.