Biotinylated allergens and extracts available
Citeq specializes in the production of allergenic extracts. We offer a broad assortment of extracts from house dust and storage mites, insects, molds, food, and plants. In addition to our regular products, we now supply biotinylated extracts for research purposes. Biotinylated products have a wide range of applications in the field of respiratory allergy, as … Continued
/ 13 June 2023
Launch of our sister company Alfateq
At Citeq we always strived for academic collaborations and personal contact. We noticed that some of our customers just want an easy and fast way to order. For those of you we have launched our sister company: Alfateq. On this website we offer a selection of Citeq’s bestsellers in small vials. We also have several … Continued
/ 20 February 2023
Pollen Extracts: expanding our assortment
We are very excited to announce that our team succeeded in producing the first large batches of high quality pollen extracts! First steps into the world of pollen allergy Pollen is one of the most common triggers of seasonal allergies worldwide. Depending on the season, weeds, grasses and trees release pollen to fertilize their own … Continued
/ 20 February 2023
Peanut Extract: development of a new product
We are very excited to announce that our team succeeded in producing the first large batch of high quality peanut extract! First steps into the world of food allergy Peanut allergy is one of the most common food allergies. Currently 1-2% of the world population has peanut allergy. Amongst them are many children who suffer … Continued
/ 16 February 2023
Mycoplasma and House Dust Mites; the tiny troublesome duo
Mycoplasma’s are the nightmare of every laboratory personnel where sometimes it seems they can’t wake up from. They are responsible for cell culture contamination which can lead to negative influence on the research results. Don’t be startled if you found out about Mycoplasma’s for the first time at your laboratory, because they are responsible for … Continued
/ 23 August 2022
Mycoplasma and House Dust Mites; the tiny troublesome duo
HDM extracts are made from natural animal material which opens up the possibility for different kinds of bacteria to be present in them from the mite of origin. Autoclaving is not possible with mite extracts as this negatively impact the product and although filtering over a 0,22μm filter does diminish bacterial and fungal contamination it does nothing against one bacterial genus called Mycoplasma.
/ 4 March 2021
What are Endotoxins (LPS)
Endotoxin, also referred to as Lipopolysacharides (LPS), is the major component of the outer membrane of Gram-negative bacteria and is released upon disintegration of the intact bacteria (Gorbet et al, 2004). This can occur either through growth, division, cell death, lyses or mechanical destruction during the manufacturing process. The endotoxins comprise of a core polysaccharide … Continued
/ 19 November 2020
Buffers containing phosphoric ions
In short: Buffers using phosphates, such as the commonly used phosphate buffered saline (PBS), are frequently used in biochemical research. When your intentions is to freeze a product for long-term storage, we advise against using a phosphate buffer but suggest using a saline (0.9% NaCl) instead. During freezing, phosphoric acid is formed and could negatively … Continued
/ 21 September 2020
Stability HDM extracts
We have performed stability studies to see if our HDM (house dust mite) extracts such as the D. pteronyssinus extract and D. farinae extracts are still stable. We collected data over the course of 5 years and the conclusion is that the HDM extracts are still within the limits although there is a change. The … Continued
/ 24 August 2020
Influence COVID-19 on service Citeq
INFLUENCE CORONAVIRUS ON ORDERS Unfortunately there is no escaping it. The corona virus is spreading rapidly around the world and is also affecting the deliveries of orders. That is why we want to keep you informed about the status and the effect on the delivery of your order. Below is an overview of the most … Continued
/ 23 March 2020
Citeq at the ISMA in Amsterdam
Later this week (28-30 November) we will be present at the International Symposium on Molecular Allergology (ISMA) in Amsterdam. You can find us during the exhibition at booth 1 and we would be glad to welcome you there! ISMA 2019 Over the past decade, molecular allergology has gained increasing impact on the field of allergy … Continued
/ 25 November 2019
EAACI 2019 in Lisbon
In a few weeks time we are present at the EAACI congress (2 to 4 June) in the beautiful city of Lisbon. You can find us in hall 2, stand C.19. At the EAACI we will be presenting new products such as the HDM Elisa Kits and also the introduction of unique standards of purified … Continued
/ 16 May 2019
Obituary Tim Smilda
Behind every tear is a smile of memory Unfortunately we received the message that our very valued colleague died very suddenly at the age of 57 He worked for our company for many years and with great dedication. First in his role as Head of R&D, where beautiful products have been developed for our company … Continued
/ 14 May 2019
Instructional video ELISA kit
HDM ELISA kits With the release of our house dust mite ELISA kits we have extended our HDM product catalogus. For the house dust mite D. pteronyssinus we have the Der p 1 ELISA kit and Der p 2 ELISA kit available. For the house dust mite D. farinae we have the Der f 1 … Continued
/ 8 March 2019
Solubility of HDM extracts
Introduction On this page we describe the results for determining the solubility of HDM extracts. We have dissolved the Dermatophagoides pteronyssinus extract FD (freeze-dried) and whole culture D. farinae extract FD (freeze-dried) in 70% DMSO. We have compared this with demineralized water (demi water) and a borate buffer. DMSO (dimethyl sulfoxide) is a organic compound which … Continued
/ 14 January 2019
Stability of freeze-dried material during transport
Products produced by Citeq Biologics are stored at -20°C and transport of these products occurs at ambient temperatures. Therefore, long term stability studies are performed at -20°C and short term stability studies are performed at ambient temperature (transport). In this case we have performed a stability study for the cockroach species Blatta orientalis. Materials & … Continued
/ 14 December 2018
Mixture of house dust mites
Because D. pteronyssinus and D. farinae house dust mites are the most studied species we have developed a mixture of both species. The mixture is available as an extract but also as a whole culture of mites. Dermatophagoides farinae and Dermatophagoides pteronyssinus are insects from the class arachnid. Combined with Euroglyphus maynei these 3 species … Continued
/ 16 November 2018
House dust mite allergy explained
House dust mites (HDMs) are arachnoids and belong to the Pyroglyphidae family. HDMs are present in every household. Living within dust, textile, carpets, beds and upholster furniture (Colloff, 2009). Humans get exposed to HDMs allergens and other indoor allergens on a daily basis. The dust mite itself isn’t harmful to humans and animals, but the real … Continued
/ 1 November 2018
House dust mite excrements/ faeces
House dust mites are a major source of allergens and a major contributor to allergic diseases such as asthma, rhinitis, and atopic dermatitis. House dust mite excrements are considered the main source of allergy (1). More than 95% of the allergen accumulating in mite cultures is associated with faecal particles. House dust mite faeces … Continued
/ 1 October 2018
Cockroach allergens
Out of all the species there are only five cockroaches which commonly inhabit homes and have the potential to induce respiratory allergies. These 5 species are Blattella germanica, Blatta orientalis, Periplaneta americana, Supella longipalpis and Periplaneta fuliginosa. Sensitisation to these species in asthma patients varies between 30-60% worldwide. Cockroach allergens are derived from several sources, such as saliva, fecal material, secretions, … Continued
/ 7 September 2018
Mite bodies and Whole cultures
Raw allergen source materials Besides our widely used allergen extracts we also produce mite whole cultures and mite bodies from Dermatophagoides pteronyssinus, Dermatophagoides farinae, Acarus siro and Blomia tropicalis. All products are produced by Citeq Biologics under well-defined parameters. Using house dust mites as raw materials, various extracts can be prepared, e.g. from whole cultures … Continued
/ 29 June 2018
Der p 23 allergen from HDM
The house dust mite (HDM) Dermatophagoides pteronyssinus is recognized as one of the most common sources of indoor airborne allergens triggering allergic sensitizations in approximately 20% of the population from industrialized countries. Up to now, 18 different D. pteronyssinus allergen groups in addition to Der p 1 and Der p 2 have been referenced and … Continued
/ 29 June 2018
EAACI Congress 2018
Organised by the European Academy of Allergy and Clinical Immunology (EAACI), Europe’s largest medical association in the field of allergy and clinical immunology, the EAACI Congress 2018 offers a unique opportunity to learn about the latest discoveries. With healthcare professionals and key opinion leaders joining from around the world, this meeting offers an excellent platform … Continued
/ 15 March 2018
Goat anti-mouse antibodies
Anti-mouse antibodies As an addition to our HDM allergens and biotinylated products we can now deliver anti-mouse antibodies. Together with our biotinylated HDM allergen products, antibodies can be used to quantify HDM allergen specific IgE/ IgG1/ IgG2a antibodies in mouse serum using an ELISA method. The antibody can be coated on an ELISA plate and … Continued
/ 17 January 2018
Increase in atopic sensitization rate among Dutch children
There are more and more children with allergies. Within 20 years, the number of children with one or two positive allergy tests in the Zwolle region (city in the Netherlands) increased by nearly 10 percent. This is based on a research by the Isala Hospital in Zwolle. “We have to stay alert to serious cases … Continued
/ 5 January 2018
ISMA 2017
This week we are attending and sponsoring the ISMA symposium in Luxemburg. The ISMA (International Symposium on molecular Allergology) is taking place from 9 – 11 November 2017 and will cover topics such as the allergome, but also the analysis of molecular allergen structures and the challenges in molecular diagnosis and therapy of allergic diseases. … Continued
/ 10 November 2017
Honeybee and wasp venom extract shortage?
All over the news are stories that there is a shortage of bee and wasp venom. This is not the case at Citeq. We have Apis mellifera bee venom and a mixture of Vespula vulgaris/ Vespula germanica wasp venom available from stock. High quality extracts which can be delivered to you immediately. You can download … Continued
/ 6 July 2017
Looking back at the EAACI 2017
EAACI 2017 in Helsinki Great weather, a beautiful city, nice people and interesting discussions. It has been a great week at the EAACI 2017 in Helsinki. First of all we would like to thank everybody who came to visit our booth! We’ve learned a lot from you and we are definitely are going to use … Continued
/ 24 June 2017
Come visit us at the EAACI Congress 2017
Next week (17-21 June) you can meet us at the EAACI congress in Helsinki (Finland). Please come visit us at booth A14, we are looking forward to meeting you. We would like to hear your experiences and wishes so we can learn from you. What are your requirements for allergen source materials? What would you … Continued
/ 12 June 2017
HDM extract dose dependent increase observed in IL-33 levels
During the EAACI congress next week in Helsinki (Finland) a poster will be presented by L.S. van Rijt (AMC, Amsterdam, the Netherlands) using our HDM products. The subject of this poster is: evaluation of a murine allergic asthma model to study immunotherapy with purified Der p 1 and Der p 2. Experimental design Method Lung tissue … Continued
/ 12 June 2017
ATS Conference, Washington DC
Last week we have presented our products at the ATS Conference in Washington DC. Our main focus was the use of house dust mite extracts for the use in animal models. We want to thank everybody for their interest and inspiration, it was a great succes! Maybe we see each other again at the EAACI congress … Continued
/ 30 May 2017
Come visit us at the following exhibitions
This year we will be attending the ATS conference in Washington DC (USA) and the EAACI congress in Helsinki (Finland). You can meet us there and ask us everything about allergen source materials. Do you want to schedule a meeting? Please let us know! We are looking forward to meeting you there. ATS International Conference, 19-24 … Continued
/ 20 April 2017