You are asking if soaking peanuts and soybeans in vinegar overnight produces nitrites? Yes. Peanuts and soybeans with vinegar in the pickling process, nitrate in the role of reducing bacteria, will produce nitrite, nitrite is a strong oxidant, into the bloodstream will be combined with hemoglobin, so that the oxygenated hemoglobin into methemoglobin, so that hemoglobin loss of oxygen-carrying capacity, resulting in tissue hypoxia.