Chromatography Kit<\/p>\n
Practical paper chromatography offers motivational learning opportunities, but relies on standard analytical grade papers or much less satisfactory alternatives such paper towelling.<\/p>\n
Using, for example, a mixture of CMY inkjet printer inks the card will produce a separation column up to 50mm in length in approximately 5 minutes. A whole class set of 100mm long spills can cost less than a single analytical grade equivalent spill<\/p>\n
Applications include: basic chromatography separation, forensic techniques, stain diffusion patterning, colour diffusion patterning, records of chemical reactions, fluid syphoning \u2013 i.e., how to empty a cup with a bent wick!<\/p>\n
The material is supplied in packs of 10 20x20cm sheets.<\/strong><\/p>\n It is an\u00a0analytical<\/a>\u00a0method used to separate coloured chemicals or substances.<\/sup>\u00a0Erwin Chargaff<\/a>\u00a0credits in Weintraub\u2019s history of the man the 1944 article by Consden, Gordon and Martin with sparking his discovery of\u00a0Chargaff\u2019s rules<\/a>, an important precursor to\u00a0Watson and Crick<\/a>\u2018s discovery of the\u00a0double-helix structure<\/a>\u00a0of\u00a0DNA.<\/a>\u00a0For which they were awarded the\u00a0Nobel Prize in Physiology or Medicine<\/a>\u00a0in 1962.<\/sup><\/sup>\u00a0It is now primarily used as a teaching tool, having been replaced in the\u00a0laboratory<\/a>\u00a0by other chromatography methods such as\u00a0thin-layer chromatography<\/a>\u00a0(TLC).<\/p>\n A paper chromatography variant,\u00a0two-dimensional chromatography<\/a>\u00a0involves using two solvents and rotating the paper 90\u00b0 in between. This is useful for separating complex mixtures of compounds having similar polarity, for example,\u00a0amino acids<\/a>. The setup has three components. The mobile phase is a solution that travels up the stationary phase, due to\u00a0capillary action<\/a>. The mobile phase is generally a mixture of non-polar organic solvent, while the stationary phase is polar inorganic solvent water. Here paper is used to support the stationary phase, water. Polar water molecules are held inside the void space of the cellulose network of the host paper. The difference between\u00a0TLC<\/a>\u00a0and paper chromatography is that the stationary phase in TLC is a layer of adsorbent (usually\u00a0silica gel<\/a>, or\u00a0aluminium oxide<\/a>), and the stationary phase in paper chromatography is less absorbent paper.<\/p>\n","protected":false},"excerpt":{"rendered":" Chromatography Kit Practical paper chromatography offers motivational learning opportunities, but relies on standard analytical grade papers or much less satisfactory<\/p>\n","protected":false},"featured_media":52145,"template":"","meta":[],"product_brand":[],"product_cat":[315],"product_tag":[],"class_list":{"0":"post-52146","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-technology-replaceables","8":"first","9":"instock","10":"taxable","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/stem-toys.gr\/en\/wp-json\/wp\/v2\/product\/52146","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/stem-toys.gr\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/stem-toys.gr\/en\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/stem-toys.gr\/en\/wp-json\/wp\/v2\/media\/52145"}],"wp:attachment":[{"href":"https:\/\/stem-toys.gr\/en\/wp-json\/wp\/v2\/media?parent=52146"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/stem-toys.gr\/en\/wp-json\/wp\/v2\/product_brand?post=52146"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/stem-toys.gr\/en\/wp-json\/wp\/v2\/product_cat?post=52146"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/stem-toys.gr\/en\/wp-json\/wp\/v2\/product_tag?post=52146"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Paper chromatography<\/b><\/h3>\n