214nm Bandpass Filter

Context: This patent describes a system for early cancer detection by analyzing pteridine levels in biological samples (like urine) using Capillary Electrophoresis (CE) and Laser Induced Fluorescence (LIF).

Usage: The 214 nm bandpass filter (or detection setting) is used as the specific absorbance monitoring wavelength to detect and quantify pteridine compounds and other biomarkers alongside fluorescence detection.

Function: It isolates the specific 214 nm wavelength (often from a Zinc or Deuterium source) where these organic molecules exhibit peak absorption, ensuring that only the relevant absorbance signal is measured without interference from other UV wavelengths.

Result: Provides a high-sensitivity "fingerprint" of the sample's composition, allowing the apparatus to distinguish between cancerous and normal samples based on elevated levels of specific pteridines.

Context: This patent details a water treatment device that uses specific combinations of light wavelengths to modify the structure of water or sterilize it.

Usage: The 214 nm bandpass filter (or a source strictly filtered to 214 nm) is used as part of a "wavelength set option" (specifically combined with 427 nm and 855 nm) to irradiate water flowing through a transparent container.

Function: It acts as a spectral selector that ensures the water is exposed specifically to deep UV radiation at 214 nm, which is highly energetic and capable of disrupting biological contaminants or altering hydrogen bond networks, without heating the water with broader IR/visible spectra.

Result: Achieves treated water with modified structural properties (and sterilization), which the patent claims can have beneficial therapeutic effects or improved purity.

Context: A system for analyzing proteins in a capillary tube without needing external dye labels (using the protein's "native" fluorescence).

Usage: The 214 nm bandpass filter is used to establish a baseline absorbance measurement to compare against the new fluorescence method.

Function: It isolates the 214 nm line to target the peptide bond (amide bond) common to all proteins. Because every protein backbone absorbs at 214 nm, this filter allows the system to "count" the total amount of protein present regardless of its specific amino acid sequence.

Result: Enables the system to quantify the total protein concentration accurately, serving as a critical reference standard to validate the more specific fluorescence data.