The\u00a0application\u00a0will\u00a0determine\u00a0the\u00a0proper\u00a0agarose\u00a0to\u00a0choose.\u00a0Gel\u00a0electrophoresis\u00a0techniques\u00a0use\u00a0standard\u00a0\/low\u00a0melting\u00a0regularand\u00a0GQT (Genetic\u00a0Quality\u00a0Tested)\u00a0grades\u00a0and\u00a0sieving\u00a0agaroses,\u00a0and\u00a0finally\u00a0sieving\u00a0agaroses\u00a0that\u00a0separate\u00a0large\u00a0and\u00a0small\u00a0sizeDNA\u00a0fragments\u00a0which also have many uses including blotting, cloning, PCR amplification techniques, etc.<\/p>\n\n\n\n
The\u00a0agarose\u00a0concentrations\u00a0that\u00a0are\u00a0commonly\u00a0used\u00a0to\u00a0separate\u00a0nucleic\u00a0acids\u00a0are\u00a0found\u00a0in\u00a0the\u00a0range\u00a0of\u00a00.5\u00a0%\u00a0–\u00a04\u00a0%\u00a0(even\u00a0as\u00a0lowas\u00a00.3\u00a0%\u00a0,\u00a0if using\u00a0D-5\u00a0agarose).\u00a0The\u00a0appropriate\u00a0concentration\u00a0depends\u00a0on\u00a0the\u00a0type\u00a0of\u00a0agarose\u00a0and\u00a0the\u00a0size\u00a0of\u00a0the\u00a0fragments\u00a0tobe\u00a0separated,\u00a0as\u00a0a general\u00a0rule,\u00a0higher\u00a0concentrations\u00a0must\u00a0be\u00a0used\u00a0if\u00a0smaller\u00a0size\u00a0fragments\u00a0need\u00a0to\u00a0be\u00a0separated.<\/p>\n\n\n\n
TAE and TBE are the typical buffers of choice. The two buffers are similar and may be used with any type of agarose; however, they do\u00a0have different properties which make them appropriate for different applications. The 1X TAE buffer has a low ionic strength and low\u00a0buffering capacity which makes it necessary to recirculate the buffer solution when electrophoresis run times are long, whereas the 1X TBE buffer has a high ionic strength and high buffering capacity allowing for extended run times ; this buffer is also recommended for\u00a0smaller fragments, especially with small differences in sizes between them. Lastly, the 1X TAE buffer enhances separation of large DNA\u00a0fragments.<\/p>\n\n\n\n
Both buffers, TAE (1X) and TBE (1X or 0.5X), may be used. TAE provides better resolution for large fragments (> 10 kb), while TBE has less mobility and provides better resolution for smaller fragments (< 1 kb).<\/p>\n\n\n\n
If\u00a0DNA\u00a0need\u00a0to\u00a0be\u00a0recovered\u00a0from\u00a0the\u00a0gel\u00a0for\u00a0later\u00a0manipulation,\u00a0the\u00a0TAE\u00a0buffer\u00a0is\u00a0recommended.\u00a0Where\u00a0the\u00a0TBE\u00a0buffer\u00a0to\u00a0beused,\u00a0the\u00a0borate in\u00a0the\u00a0buffer\u00a0would\u00a0nteract\u00a0with\u00a0the\u00a0hydroxyl\u00a0groups\u00a0of\u00a0the\u00a0agarose\u00a0polysaccharide\u00a0forming\u00a0complexes\u00a0thatmay\u00a0hinder\u00a0recovery.<\/p>\n\n\n\n
Recirculation prevents\u00a0the formation of\u00a0a pH gradient and buffer\u00a0depletion,\u00a0therefore recirculation may\u00a0be necessary\u00a0forextended (>\u00a05 hours) electrophoresis when TAE buffer is used because of its low buffering capacity.<\/p>\n\n\n\n
The recommended voltage is 4-10 volt\/cm (distance between the anode and cathode, not the length of the gel) in horizontal electrophoresis.\u00a0If\u00a0the\u00a0voltage\u00a0is\u00a0too\u00a0low,\u00a0the\u00a0mobility\u00a0of\u00a0the\u00a0bands\u00a0is\u00a0reduced,\u00a0and\u00a0band\u00a0broadening\u00a0will\u00a0occur\u00a0due\u00a0to\u00a0diffusion.If\u00a0the\u00a0voltage is too high, the resolution diminishes mainly due to the gel overheating.As a rule lower voltage (1-2V\/cm) larger sizes (>10 Kb) and higher voltage (4-10 V\/cm) smaller sizes (< 1Kb)<\/p>\n\n\n\n
The most frequent cause of wavy bands is dried gel residues stuck to the teeth of the comb. To prevent this, the comb should be well cleaned\u00a0and\u00a0possible\u00a0residues\u00a0eliminated.\u00a0Care\u00a0is\u00a0needed\u00a0when\u00a0withdrawing\u00a0the\u00a0comb\u00a0from\u00a0the\u00a0gel\u00a0to\u00a0avoid\u00a0draggingpart\u00a0of\u00a0the\u00a0gel\u00a0with\u00a0the comb.\u00a0Maintaining\u00a0the\u00a0gel\u00a0at\u00a04\u00baC\u00a0for\u00a030\u00a0minutes\u00a0is\u00a0recommended,\u00a0or\u00a0dipping\u00a0it\u00a0in\u00a0the\u00a0buffer\u00a0beforewithdrawing\u00a0the\u00a0comb.<\/p>\n\n\n\n
The\u00a0quantity\u00a0is\u00a0variable,\u00a0however,\u00a0what\u00a0is\u00a0important\u00a0is\u00a0the\u00a0quantity\u00a0of\u00a0DNA\u00a0in\u00a0the\u00a0bands\u00a0of\u00a0interest.\u00a0The\u00a0minimum\u00a0quantity\u00a0ofDNA\u00a0that\u00a0may be\u00a0detected\u00a0by\u00a0means\u00a0of\u00a0EtBr\u00a0staining\u00a0is\u00a010\u00a0ng.\u00a0The\u00a0amount\u00a0of\u00a0DNA\u00a0depends\u00a0on\u00a0well\u00a0volume,\u00a0fragment\u00a0sizeand\u00a0distribution\u00a0of\u00a0fragment sizes.\u00a0The\u00a0maximum\u00a0quantity\u00a0of\u00a0DNA\u00a0that\u00a0you\u00a0may\u00a0have\u00a0in\u00a0a\u00a0band,\u00a0which\u00a0can\u00a0still\u00a0be\u00a0clear\u00a0andwell\u00a0defined,\u00a0is\u00a0approximately\u00a0100\u00a0ng.\u00a0These quantities\u00a0may\u00a0vary\u00a0if\u00a0another\u00a0staining\u00a0system\u00a0is\u00a0used.\u00a0To\u00a0determine\u00a0theappropriate\u00a0quantity,\u00a0various\u00a0lines\u00a0with\u00a0different\u00a0quantities\u00a0may\u00a0be\u00a0loaded.<\/p>\n\n\n\n
The thickness of the gel is very important so a 3-4 mm thick comb is recommended. The thickness of the comb is also important and signficantly\u00a0affects\u00a0the\u00a0resolution.\u00a0A\u00a0thin\u00a0comb\u00a0(1\u00a0mm)\u00a0produces\u00a0very\u00a0well\u00a0dried\u00a0bands,\u00a0while\u00a0a\u00a0thick\u00a0combproduces\u00a0thick\u00a0bands\u00a0leading\u00a0to reduced resolution.<\/p>\n\n\n\n
Any method is appropriate. The most convenient and fastest method is dissolving the agarose in a microwaving. For high concentrations where viscosity and foaming\u00a0make a difficult dissolution, dissolving in a boiling water bath is easier. Similarly, dissolving by autoclaving is very good option when working at very high concentrations, and when a sterile solution is desired.<\/p>\n\n\n\n
It\u00a0is\u00a0recommended\u00a0to\u00a0hydrate\u00a0the\u00a0agarose\u00a0powder\u00a0in\u00a0the\u00a0buffer\u00a0for\u00a010-15\u00a0minutes\u00a0before\u00a0heating\u00a0to\u00a0complete\u00a0the\u00a0dissolution.The\u00a0hydration time\u00a0minimizes\u00a0foaming\u00a0and\u00a0makes\u00a0the\u00a0dissolution\u00a0easier.\u00a0When\u00a0microwaving,\u00a0it\u00a0is\u00a0important\u00a0not\u00a0to\u00a0superheatthe\u00a0agarose.\u00a0As\u00a0an\u00a0option,\u00a0if the\u00a0microwave\u00a0power\u00a0is\u00a0too\u00a0high,\u00a0foaming\u00a0can\u00a0be\u00a0minimized\u00a0by\u00a0heating\u00a0the\u00a0flask\u00a0for\u00a01\u00a0minute,removing\u00a0it\u00a0from\u00a0the\u00a0microwave\u00a0oven,\u00a0gently swirl\u00a0the\u00a0flask\u00a0to\u00a0resuspend\u00a0any\u00a0settled\u00a0powder,\u00a0put\u00a0again\u00a0in\u00a0the\u00a0microwave\u00a0andheat\u00a0for\u00a0another\u00a0minute\u00a0or\u00a0untill\u00a0total\u00a0solution.<\/p>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
Below are the most frequently asked questions we receive from our customers.<\/p>\n","protected":false},"author":10,"featured_media":2309,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[25,29],"tags":[34,36,37],"class_list":["post-2308","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-life-sciences","tag-agaroses","tag-electrophoresis","tag-faq"],"acf":[],"yoast_head":"\n