HYBRID EVENT: You can participate in person at Rome, Italy or Virtually from your home or work.

10th Edition of World Nanotechnology Conference

March 10-12, 2025

March 10 -12, 2025 | Rome, Italy
World Nano 2021

Sadia Afrin Khan

Sadia Afrin Khan, Speaker at Nanomaterials Conference
Food and Drug Administration, United States
Title : Characterization of nanoparticles in silicon dioxide food additives


Food additives are added to food for their technical effect in food (e.g., emulsifier, stabilizer, thickener, anticaking agent, antioxidant, etc.). Food grade additives may have a particle size distribution that extends into the nanoscale range. Silicon dioxide, in its amorphous form, is an approved food additive (21 CFR 172.480) for use as an anticaking agent. During production, there is a possibility of the occurrence of nanosized silicon dioxide particles, however, there are limited data concerning the particle size distributions of food-grade silicon dioxide. Therefore, we conducted multi analytical techniques to characterize the particle size distribution of six commercially available silicon dioxide food additives. In this work, dynamic light scattering was used to measure particle size distribution, electron microscopy for imaging and single-particle inductively coupled mass spectrometry (sp-ICP-MS) to measure the concentration of nano-sized materials present in silicon dioxide additives. These results allow the USFDA to gain a greater understanding of the nano-sized particle occurrence in commercial food-grade silicon dioxide intended for use as food additives.

Audience take away:

The audience will know about the characterization of nanoparticles that may present in silicon dioxide food additives. They will also know the perspectives of USFDA about nanomaterial.


Dr. Sadia Afrin Khan is a research scientist in the Center for Food Safety and Applied Nutrition (CFSAN) at the US Food and Drug Administration. Dr. Khan received her Ph.D. degree in Chemistry from Jackson State University in 2013. Her research interest includes analysis of nanomaterial, nanomaterial-based assay for toxin detection as well as characterization of nanoparticle in food additives. She has over twenty publications in high impact journals and cited no less than 2458 times.