PureSperm 40/80 – 2×20 ml

Cat. No. PSK-020 Category:

Ready-diluted to save gradient preparation time.

PureSperm 40, PureSperm 80 and PureSperm 90 provide all the advantages of a PureSperm 100 gradient, with the added convenience that they come already diluted, saving preparation time. PureSperm 40, PureSperm 80 and PureSperm 90 are formulated to minimize sudden pH and osmolarity changes during the transition of sperm from the semen sample to the fertilization medium. This helps avoid premature hyperactivation and improves fertilization potential.

  • PureSperm 40, PureSperm 80 and PureSperm 90 are formulated to minimize sudden pH and osmolarity changes during the transition of sperm from a semen sample to the fertilization medium. This helps avoid premature hyperactivation and improves fertilization potential.
  • PureSperm 40, PureSperm 80 and PureSperm 90 maintain a pH of between 7.4 – 7.8 at room temperature (17 to 27°C) and when incubated at 37°, providing suitable conditions for good sperm motility, survival time, and fertilization potential.
  • These preparations contain glucose as a usable energy substrate for normal cell metabolism and sperm function.
  • The gradient enables motile sperm to be separated from extrawhen incubated neous cells and seminal plasma. In addition, damage to sperm DNA and structural molecules caused by reactive oxygen species (ROS) is minimized by the effective removal of immature sperm and lymphocytes. Bacteria, epithelial cells, and cell debris are also separated from the motile sperm, which can be difficult to achieve in polysucrose-based gradient preparations.
  • Silane-coated silica
  • Potassium chloride
  • Sodium chloride
  • Purified water
  • EDTA
  • Glucose
  • Sodium pyruvate
  • Calcium chloride

Performance Characteristics

  • pH: 7.4 – 7.8.
  • Osmolality (mOsm/kg H2O): 300 – 310.
  • Endotoxin transfer during treatment: <1.0 EU/mL.
  • Sperm survival 18 hours after density gradient separation: >70%.
  • Contents are tested by human sperm survival.
  • Bottles and stoppers are M.E.A. tested.
Storage and Stability
  • Store unopened bottles between 2 and 27ºC. Avoid temperatures above or below these values. When stored at these conditions, PureSperm 40, PureSperm 80 and PureSperm 90 have a shelf-life of 24 months from the date of production. The expiry date is shown on both bottles and cartons.
  • Open and close bottles under aseptic conditions. After opening, store between 2 and 8ºC when not in use. The shelf-life described on the product label is only applicable when the product is stored according to manufacturer’s recommendations.
  • No antibiotics, unstable additives, or preservatives have been added PureSperm 40, PureSperm 80 and PureSperm 90.
Precautions and warnings
  • When retrieving the sperm pellet, follow the instructions given in the pack insert to avoid inadvertent contamination.
  • Use aseptic procedures at all times.
  • If available, use sealed centrifuge buckets during centrifugation to avoid creation of aerosols.
  • Clean accidental spills using a dampened cloth or paper. PureSperm 40, PureSperm 80 and PureSperm 90 cause floors and benches to be extremely slippery.
  • PureSperm 40, PureSperm 80 and PureSperm 90 do not represent any kind of fire or combustion hazard. A material safety data sheet is available from the distributor or manufacturer(see nidacon.com).
  • Do not use any solution which shows evidence of bacterial contamination.
  • Do not use contents if tamper-evident seal is broken.
  • Federal Law (USA) restricts this device to sale by or on the order of a physician.
  • Please check for regulatory compliance governing the use of ART products in your country.
General recommendations

It can be extremely difficult to obtain a high yield of motile sperm from highly viscous, semen samples. Nidacon has developed a method that can be helpful in solving this problem in the lab. You simply add PureSperm Buffer to the ejaculate, incubate for 15-30 minutes at 37°C and the sample is ready to use with reduced viscosity. Importantly, this will give you a much higher yield of motile sperm.


For sperm preparation from a viscous semen sample:
1. Bring all solutions to room temperature (17 to 27°C).
2. Measure the volume of the semen sample.
3. Dilute 1+2 , 1 part PureSperm Buffer and 2 parts semen sample
(e.g. 0.5 ml PureSperm Buffer + 1.0 ml semen sample).
4. Incubate at 37°C for 15-30 minutes.
5. Mix using a pipette.
6. Ready for sperm preparation on a density gradient.


SDS – View PDF

Product insert (latest version) – View PDF 40/80/90

For other languages, contact Nidacon

Comparative proteomic analysis of spermatozoa isolated by swim-up or density gradient centrifugation

Stefania Luppi1, Monica Martinelli1, Elisa Giacomini2, Elena Giolo1, Gabriella Zito2, Rodolfo C Garcia3† and Giuseppe Ricci12*†
Reproductive Biology and Endocrinology 2015, 13:36

Comparison of the DNA Fragmentation and the Sperm Parameters after Processing by the Density Gradient and the Swim up Methods

Iraj Amiri, Marzieh Ghorbani, Safora Heshmati
Journal of Clinical and Diagnostic Research. 2012 November, Vol-6(9): 1451-1453

Comparative study of the effects of three semen preparation media on semen analysis, DNA damage and protamine deficiency, and the correlation between DNA integrity and sperm parameters.

Charoenchai Chiamchanya, Nattpawit Kaewnoonual, Pachara Visutakul, Sirikul Manochantr and Jirattikan Chaiya.
Asian J Androl. 2010 Mar;12:271-277.

The use of two density gradient centrifugation techniques and the swim-up method to separate spermatozoa with chromatin and nuclear DNA anomalies.

Sakkas D, Manicardi GC, Tomlinson M, Mandrioli M, Bizzaro D, Bianchi PG, Bianchi
U.Hum Reprod. 2000 May;15(5):1112-6.

DNA fragmentation of spermatozoa and assisted reproduction technology.

Henkel R, Kierspel E, Hajimohammad M, Stalf T, Hoogendijk C, Mehnert C, Menkveld R, Schill WB, Kruger TF.
Reprod Biomed Online. 2003 Oct-Nov;7(4):477-84.

Recovery and survival of sperm is higher with PureSperm density gradient than swim-up in neat and cryopreserved-thawed semen specimen.

P Ranganathan, A Agarwal
Fertil Steril, 2001

Comparative study on density gradients and swim-up preparation techniques utilizing neat and cryopreserved spermatozoa.

Allamaneni SS, Agarwal A, Rama S, Ranganathan P, Sharma RK.
Asian J Androl. 2005 Mar;7(1):86-92.

Bacterial contamination and sperm recovery after semen preparation by density gradient centrifugation using silane-coated silica particles at different g forces

C.M. Nicholson L. Abramsson, S.E. Holm and E. Bjurulf
Human Reproduction, Vol. 15, No. 3, 662-666, March 2000

The use of PureSperm, mini-Percoll and swim-up preparation techniques to separate spermatozoa with chromatin and nuclear DNA anomalies.

M. Tomlinson et al
Abstract Andrology in the nineties 1999

Higher rates of recovery with PureSperm density gradient compared to ISolate

Agarwal, A. and Ranganathan, P.ESHRE 2001

A comparison of two density gradient preparations for sperm separation for medically assisted conception: Effect on recovery, clean-up, motility, and motion parameter.

J. A. Roudebush, et al.
Supplement of the 27th Annual Meeting of American Society of Andrology, 81 Seattle, USA (March/April 2002)

Comparison of Six Density Gradient Media for Selection of Cryopreserved Donor Spermatozoa

Nathalie Mousset-Siméon, Nathalie Rives, Lydie Masse, Florence Chevallier and Bertrand Mace
Journal of Andrology, Vol. 25, No. 6, November/December 2004

What diluent has been added to PureSperm to produce PureSperm 40 and PureSperm 80?

PureSperm 40 and PureSperm 80 are optimised products in their own right; they are not diluted PureSperm 100. However, the colloid, salts and buffering capacity of these products have been optimised to provide the ideal “40%” and “80%” gradient layers.

Is there any human serum albumin in PureSperm 40 and PureSperm 80?

Research in our laboratory showed that the yield of motile sperm recovered from the gradient was approximately the same, regardless of whether or not the gradient layers contained human serum albumin. Therefore, we have not included any protein inPureSperm 40 and PureSperm 80. The colloid in these products eliminates aggregation of sperm and reduces their sticking to the centrifuge tube. However, human serum albumin must be added to the “wash” solution, as provided in PureSperm Wash.

Are antibiotics included in PureSperm 40 and PureSperm 80?

No, PureSperm 40 and PureSperm 80 do not contain antibiotics, for the following reasons: 1. The gradient will remove most, if not all, of the bacterial contamination present in the ejaculate, provided that the retrieval of the sperm pellet is carried out according to the instructions given in the package insert. 2. Antibiotics commonly used in cell culture media are toxic to sperm.

What is the buffer component of PureSperm 40 and PureSperm 80?

PureSperm 40 and PureSperm 80 contain Hepes buffer to avoid fluctuations in pH which might be harmful to sperm.

What should be used for washing the sperm pellet after the PureSperm 40 and PureSperm 80 gradient centrifugation?

We recommend PureSperm Washfor washing the sperm pellet after gradient centrifugation. The ionic balance of PureSperm Wash lies between that of the gradient and commonly used fertilisation media and, therefore, will not cause premature hyperactivation of the sperm. PureSperm Wash is also ready-to-use and contains an appropriate level of human serum albumin.

Do we need to incubate PS100 and PS40/80 in 6% CO², 37°C before use?

The most important to avoid is temperature fluctuations for the sperm. The ejaculate is approximately around room temperature or slightly higher. Therefore we recommend equilibrating PureSperm to room temperature, not more. The preparation is also done at room temperature and therefore the temperature is still maintained.