Just before the onset of Inflation, at about 10^-35 seconds after the Big Bang, the strong, weak and electromagnetic forces were physically operating with comparable strengths as the 'electro-nuclear force' and there were many species of 'supermassive' particles present, and being created in equal numbers of matter and anti-matter pairs. In addition, to these 'gauge bosons' with masses of 10^15 GeV ( 1000 trillion times the mass of the proton EACH), there were presumably supermassive 'scalar' particles called the Higgs 'X' bosons. There may also have been other scalar particles present depending on which version of supersymmetry is the correct one. These scalar particles, or more correctly, the scalar fields, are the ones whose self-interaction established the energy of the vacuum state of the universe. As the universe continued to expand and cool below 10^15 GeV, at a time after 10^-35 seconds after the Big Bang, the scalar fields interacted in such a way that the universe ended up expanding in a vacuum state which had an energy well above 'zero' or the actual minimum energy state available to the universe. This energy difference was 'locked up' in the vacuum energy of space, and the universe continued to expand in this false-minimum state until about 10^-34 or even 10^-30 seconds after the Big Bang. Throughout this time, the expansion was 'exponential' and not linear in time and is called Inflation. By the time it was over, the universe had changed from a scale of 10^-24 centimeters to several tens of centimeters in less than 10^-30 seconds.
We do not know the details, but this Inflation ended about the same time that the vacuum state was transformed from a false-minimum energy, into its lowest available state. The latent energy per cubic centimeter of the space in the universe, was transformed into a flood of particles near the supersymmetry mass scale of 10^15 to 10^10 GeV, and their decays produced both all of the cosmic fireball radiation we see now, and all the other fundamental particles including dark matter, quarks, and the like. So, the existing particles were produced by the decay of the scalar fields which caused inflation, and these scalar fields had scalar quanta ( particles ) associated with them which came into existence as real particles towards the end of Inflation. It is not believed that any of the particles that existed before Inflation survived Inflation because of the enormous dilution, and lowering of energy which would have rendered their final contribution after Inflation practically infinitessimal. Inflation eliminated any traces of any primordial matter or radiation contributions to the post-Inflation universe we now live in.