Unrivalled performances

  • Precise alignment with already existing topographies
  • Hydrogels decoration
  • Gradients and multi ligands patterning

Precise alignment with already existing topographies

The PRIMO projection system enables precise alignment of cells seeding on top of previously shaped hydrogels. Our technology permits the creation of substrate topology and allows a meticulous positioning of cells on the desire structure.

In this example, hydrogels were cured into topographies and subsequently decorated allowing COS-7 cells to colonize these structures, thus combining structural and biochemical features.


Decoration, quantitative and patterned functionalization of hydrogels D) Decoration patterns can be aligned on previously generated topographies to combine adhesive and structural cues for the cultivated COS-7 cells. Pasturel et al., Adv Health Mat, 2020.

Hydrogels decoration

PRIMO provides an easy preparation of changeable virtual masks for patterning custom designs. The precise patterning system illuminates selected regions of the hydrogel with UV light, thus enabling hydrogel template to be tailored for cells to grow or self-organize.

In this experiment, a monomer containing a caged amine was co-polymerized in the hydrogel network. Upon UV light illumination, the primary amines were locally deprotected and serve as reactive groups for further functionalization. This technique of click chemistry won the Nobel Prize in chemistry 2022.

Hydrogel gring with fluorescent dyes. (A) Schematic representation of the strategy used to pattern poly(acrylamide) hydrogels containing caged AEMA comonomers. A changeable virtual mask is used by the PRIMO patterning system to illuminate selected regions of the hydrogel with UV light and locally deprotect amine groups. (B) Confocal microscopy images of N-hydroxysuccinimide (NHS)-AF568 dye coupled to different-sized circular patterns on hydrogels using different light doses. The intensities of the images are normalized. (C) Quantification of mean fluorescence intensity inside patterned circles of different sizes as a function of UV light dose. The dashed line corresponds to the fluorescence intensity of a hydrogel containing the same concentration of AEMA (1 mM) as the caged AEMA in the patterned sample and reacted with the same amount of dye. The dotted line corresponds to a hydrogel without any AEMA and reacted with the same amount of dye. Each data point corresponds to an independent experiment (n = 2). (D) Confocal microscopy image of hydrogel patterned with a custom design (inset: binary image) and reacted with NHS-AF568 dye. D. Missirlis et al., ACS Publications, 2022.

Gradients and multi ligands patterning

The PRIMO micropatterning system enables the formation of patterns of gradients and is also compatible with multi ligands.  Also, this technique is suitable with standard traction force microscopy experimentation.

In the same study, gradients of immobilized fluorescent labels were performed, through the use of virtual masks with a gradient in gray value. Moreover, micropatterning of two different dyes was also achieved.

(E) Confocal microscopy image of hydrogel patterned with a virtual mask exhibiting a linear gradient in gray values and reacted with NHS-AF568 dye; the inset shows the fluorescence intensity profile along the white dahsed line. (F) Confocal microscopy image of a hydrogel initially patterned and reacted with an NHS-AF568 dye (green), washed, patterned again, and reacted with an NHS-Atto647N dye (magenta). (G) Young’s moduli values obtained at different locations on the surface of a hydrogel (5% Am/0.1% Bis; 1 mM caged AEMA), patterned with 250 mJ/mm2 UV light and reacted with NHS-AF568 dye. The inset shows the locations of each point overlaid on an epifluorescence image of the hydrogel surface. The values obtained for points 6−10, which are within the pattern, show no difference compared to the ones outside the pattern. Scale bar: 50 μm. D. Missirlis et al, ACS Publications, 2022.

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