AAT Bioquest offers a specialized selection of colorimetric assays optimized for NanoDrop and micro-volume spectrophotometers. These rapid, convenient assays enable researchers to quantify biotin content, protein aldehyde modifications, and pH levels using minimal sample volumes (1-2 µL). Each product in this category is specifically formulated to provide accurate, reproducible results with micro-volume spectrophotometers, eliminating the need for traditional cuvette-based measurements or plate readers.

NanoDrop-compatible Amplite® colorimetric quantitation kits enable rapid, accurate measurement of biotin and aldehyde content on proteins and other macromolecules. These kits utilize proprietary chromogenic reagents that produce stable, measurable absorbance signals. The biotin quantitation kit enables determination of biotin:protein ratios critical for optimizing biotin-streptavidin applications, while the aldehyde content kit supports site-selective protein modification workflows.

The Spexyte™ Micro pH Probe is a colorimetric pH indicator specifically optimized for micro-volume spectrophotometers like NanoDrop. This probe enables rapid, accurate pH measurements of biological samples in the physiologically relevant range of pH 4.5 to 8.5 using just 1-2 µL of sample. The probe generates a stable, reproducible absorbance signal that correlates directly with sample pH, making it ideal for quality control of buffers, cell culture media, and other biological preparations where sample volume is limited.