# What vdw and electrostatic parameters to use with Amber ff19sb

**URL:** <https://gromacs.bioexcel.eu/t/what-vdw-and-electrostatic-parameters-to-use-with-amber-ff19sb/8474>\
**Category:** User discussions\
**Created:** [February 29, 2024, 7:32pm UTC](https://gromacs.bioexcel.eu/t/what-vdw-and-electrostatic-parameters-to-use-with-amber-ff19sb/8474 "2024-02-29T19:32:28Z")\
**Posts on this page:** 1\
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**Author:** ![Eduardneu](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/eduardneu/32/1976_2.png) [@Eduardneu](https://gromacs.bioexcel.eu/u/Eduardneu)\
**Post date:** [March 2, 2024, 1:51pm UTC](https://gromacs.bioexcel.eu/t/what-vdw-and-electrostatic-parameters-to-use-with-amber-ff19sb/8474/2 "2024-03-02T13:51:23Z")

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Hey,

you should not used the non-bonded interaction parameters specified for the CHARMM36 FF with the AMBER FF. There was a discussion about which parametes are needed for the AMBER FF [here](https://gromacs.bioexcel.eu/t/mdp-parameters-for-non-bonded-interaction-using-the-amber-force-field/6458/2).

Also you can not use ParmEd to convert a ff19sb topology to GROMACS format (see [here](https://gromacs.bioexcel.eu/t/how-to-properly-convert-the-cmaptypes-in-an-amber-topology-to-a-gromacs-topology/5866) and [here](https://github.com/ParmEd/ParmEd/issues/1292).

A possible alternative to generate a ff19sb topology in the GROMACS format would be [CHARMM-GUI](https://gromacs.bioexcel.eu/t/amber-ff19sb/3097) or using a [script](https://github.com/ParmEd/ParmEd/issues/1292) to convert the AMBER ff19sb topology to a GROMACS topology.

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