Sulfo-NHS-SS-Biotin biotinylation reagent, Sulfosuccinimidyl-2-(biotinamido)-ethyl-1,3'-dithiopropionate, is cleavable, water-soluble and amino-reactive. The Sulfo-NHS-SS-Biotin molecule is cell membrane impermeable due to its sodium sulfonate group. Sulfo-NHS-SS-Biotin has a long chain spacer arm separating the biotin group from the amino-reactive sulfo-NHS ester moity. The resulting biotinylated protein can then be detected when used in conjunction with streptavidin and Immobilized Streptavidin. It is possible to cleave the biotin group from the crosslinked target protein under reducing conditions, such as in the presence of 2-mercaptoethanol, TCEP-HCl or DTT. UltraPure MALDI矩阵ProteoChem生产超纯基质辅助激光解吸电离质谱（MALDI-MS）基质产品。ProteoChem的UltraPure MALDI-MS基质通过一种专有方法进行纯化，该方法旨在通过去除可能干扰质谱分析的污染物来产生具有更高灵敏度，更高分辨率和更高信噪比的MALDI质谱图。ProteoChem的MALDI矩阵专用于分析蛋白质和多肽。ProteoChem的MALDI基质具有市场上最高的纯度。这些产品通常在98-100％的高范围内。