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. 2019 Jul 8;9:9885. doi: 10.1038/s41598-019-46086-y

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(a) Trypan blue accumulation on the surface of untreated DLBCL cell (left), while the dead cell was held in optical trap > 800 s at 100 mW of laser power what resulted in cell membrane rupture and entering the dye inside the cell. The red frame indicates the area of operating range of the optical trap, while the focused laser beam is located in the centre of the trapped cell. The scalebar is set at 15 μm. (b) Comparison of the normal and lymphoma primary cells viability exposed to laser power of 100 mW using Trypan blue. Manipulation over 756 ± 73.24 s and 819 ± 72.31s for normal and lymphoma cells, respectively damaged the cell membrane.