Background/Applications: Anthocyanins are water-soluble pigments that are responsible for the red, purple, and blue coloring in fruits and vegetables. The colored anthocyanins are used as natural food colorants, and as potential pharmaceutical ingredients that give various health benefits. Anthocyanins possess antibacterial and antioxidative qualities that have the ability to improve visual and neurological health and…
Read MoreBackground/Applications: Human skin measurements apply to many industries and field studies with differing analyses in absorbance, transmission, and or reflectance. In this experiment, we tested the absorbance and reflectance of skin samples to analyze skin pigmentation and protein structures. The skin pigmentation studied in this experiment was melanin. Melanin is mainly located in the epidermis…
Read MoreConducted by: David Ademe, Avantes Inc. Theme: Solar Simulator/Irradiance Background/Applications: Spectral irradiance is the irradiance of a surface per unit frequency or wavelength, depending on whether the spectrum is taken as a function of frequency or of wavelength. The two forms have different dimensions: spectral irradiance of a frequency spectrum is measured in watts per…
Read MoreConducted by: David Ademe (Applications Engineer), and Sara Beard (Chemistry Intern), Avantes Inc. Background/Applications: Indocyanine Green (ICG) is a powdered dye that is used for fluorescence imaging in a variety of medical applications. Indocyanine green emits fluorescence between 750 nm and 950 nm with maximum values of approximately 810 nm when dissolved in water. Compared…
Read MoreConducted by: David Ademe (Applications Engineer), Avantes Inc. Theme: NIR Reflection Spectroscopy Background/Applications: Near-infrared (NIR) spectroscopy is a spectroscopic method that uses the near-infrared region of the electromagnetic spectrum (from 780 nm to 2500 nm). Typical applications of NIR spectroscopy include the analysis of pharmaceuticals, materials, pulse oximetry, and food products. Along with food products,…
Read MoreSpectra of the Month (April, 2022) Conducted by: David Ademe (Applications Engineer), Avantes Inc. Theme: LIBS Background/Applications: Laser-Induced Breakdown Spectroscopy (LIBS) is a type of atomic emission spectroscopy which uses a highly energetic laser pulse as the excitation source. The laser is focused to form a plasma, which atomizes and excites samples. The formation of…
Read MoreSpectra of the Month (March 2022) Conducted by: David Ademe (Applications Engineer), Avantes Inc. Theme: Transmission Background/Applications: Transmission spectra can be used in a wide range of measurements and data collection to reveal unique and unknown properties of materials. It is crucial to understand how materials that we interact with behave when exposed to photons…
Read MoreTheme: Fluorescence Conducted by: David Ademe (Applications Engineer), Avantes Inc. Background/Applications: Fluorescence spectroscopy is a method where a single wavelength/band of light is used to excite a sample that emits a different wavelength of light as a result. Fluorescence has many uses, from medical studies, biological applications, chemistry experiments and sample classification. For example, the type…
Read MoreConducted by: David Ademe (Applications Engineer), Avantes Inc. Theme: Biomedical, Reflection/Transmission Background/Applications: Often times in medical applications, surrogate samples (also known as tissue phantoms) are used to simulate human tissue. Optical tissue phantoms are synthetic models mimicking not only human tissue properties but also light propagation and interactions through it. They are reported to be…
Read MoreConducted by: David Ademe (Applications Engineer), Avantes Inc. Background/Applications: Spectral irradiance is the energy of a surface per unit frequency or wavelength, depending on whether the spectrum is taken as a function of frequency or of wavelength. The two forms have different dimensions: spectral irradiance of a frequency spectrum is measured in watts per square…
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