{"id":105793,"date":"2024-07-11T23:42:17","date_gmt":"2024-07-12T05:42:17","guid":{"rendered":"https:\/\/purmabiologics.com\/blog\/?post_type=product&#038;p=105793"},"modified":"2026-07-24T15:22:46","modified_gmt":"2026-07-24T21:22:46","slug":"williams-e-medium-max","status":"publish","type":"product","link":"https:\/\/purmabiologics.com\/blog\/product\/williams-e-medium-max\/","title":{"rendered":"Williams&#8217; E Medium &#8211; Max"},"content":{"rendered":"<h2>Background<\/h2>\n<p>Williams&#8217; E Medium &#8211; Max is a commonly used media for Mammalian cell culture.<\/p>\n<h2>Advantages<\/h2>\n<h3>The advantages of Williams&#8217; E Medium &#8211; Max over Williams&#8217; E Medium are:<\/h3>\n<ul>\n<li>Higher PH Capacity<\/li>\n<li>Moreover, it contains 4 mM L-Alanyl-L-Glutamine (0.869 g\/L) instead of L-Glutamine and therefore:<\/li>\n<li>Possess longer shelf life.<\/li>\n<li>More importantly, minimizes toxic ammonia build-up.<\/li>\n<li>Significantly improves cell viability and growth.<\/li>\n<li>Remains stable across a wide range of temperatures.<\/li>\n<li>Improves the culture of primary cells.<\/li>\n<\/ul>\n<h2>Mechanism<\/h2>\n<p>Although L-glutamine is a vital amino acid, it degrades, resulting in the generation of toxic ammonia and pyrrolidine carboxylic acid. One way to minimize L-glutamine degradation in media is to gradually add these amino acids to your cell culture. However, keeping track of time to keep the amount of L-glutamine at the same level is tedious, if not impossible.<\/p>\n<p>Alternatively, L-alanyl-L-glutamine can be used because it is much more stable in aqueous solutions. More importantly, it does not easily degrade and is gradually cleaved by aminopeptidases. As a result, L-glutamine and L-alanine are then used by the cells for protein production in the TCA cycle.<\/p>\n<p>In addition to our Max formulation products, we manufacture PurMa<sup>TM <\/sup>GluaSup (Cat# P3S210 559), a combination of L-alanyl-L-glutamine which prevents degradation of L-glutamine.<\/p>\n<h2>Contents<\/h2>\n<h3>Williams&#8217; E Medium &#8211; Max contains:<\/h3>\n<ul>\n<li>5 mM sodium pyruvate<\/li>\n<li>High glucose (4.5g\/L)<\/li>\n<li>Non-Essential Amino Acids<\/li>\n<li>3.7 g\/L Sodium Bicarbonate; PurMa Biologics Manufactures several types of William\u2019s E Medium based on the amount of Sodium Bicarbonate and HEPES (PH capacity)<\/li>\n<li>Phenol Red<\/li>\n<\/ul>\n<p>Williams&#8217; E Medium &#8211; Max contains no proteins, lipids, or growth factors. Therefore, it requires supplementation, commonly with 10% Fetal bovine Serum (FBS).<\/p>\n<h2>Formulation<\/h2>\n<p>For complete formulation click here: <a href=\"https:\/\/purmabiologics.com\/blog\/wp-content\/uploads\/2023\/06\/Williams-E-Medium-MAX-Formulation-P3M110880.pdf\" target=\"_blank\" rel=\"noopener\"><strong><span style=\"color: #0000ff;\">Williams&#8217; E Medium-MAX Formulation<\/span><\/strong><\/a><\/p>\n<h2><span style=\"color: #000000;\">References<\/span><\/h2>\n<ul>\n<li><span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/5124481\/\" rel=\"nofollow noopener\" target=\"_blank\"><span style=\"color: #0000ff;\">Isolation and long-term cell culture of epithelial-like cells from rat liver.<\/span> <\/a><\/span>Williams GM, Weisburger EK, Weisburger JH. Exp Cell Res. 1971 Nov;69(1):106-12. doi: 10.1016\/0014-4827(71)90316-8. PMID:<\/li>\n<li><a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/3297308\/\" rel=\"nofollow noopener\" target=\"_blank\"><span style=\"color: #0000ff;\">Growth and continuous passage of COMMA-D mouse mammary epithelial cells in hormonally defined serum-free medium.<\/span> <\/a>Riss TL, Sirbasku DA. Cancer Res. 1987 Jul 15;47(14):3776-82. PMID: 3297308.<\/li>\n<li><span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/6792277\/\" rel=\"nofollow noopener\" target=\"_blank\">Primary in vitro antibody responses by purified murine B lymphocytes in serum-free defined medium. <\/a><\/span>Mosier DE. J Immunol. 1981 Oct;127(4):1490-3. PMID: 6792277<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<div class=\"table-2\">\n<table width=\"100%\">\n<thead>\n<tr>\n<th align=\"left\">Parameter<\/th>\n<th align=\"left\">Specification<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td align=\"left\">Appearance<\/td>\n<td align=\"left\">Red, clear liquid<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">pH<\/td>\n<td align=\"left\">7.2 \u00b1 0.1<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">Osmolality<\/td>\n<td align=\"left\">275-360 mOsm\/L<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">Endotoxin<\/td>\n<td align=\"left\">NMT&lt; 2EU\/mL<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">Mycoplasma<\/td>\n<td align=\"left\">Negative<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">Suitability<\/td>\n<td align=\"left\">\u00a0Suitable for mammalian cell culture<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">Additive<\/td>\n<td align=\"left\">Sodium pyruvate<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">Indicator<\/td>\n<td align=\"left\">Phenol red<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">Mycoplasma Detection<\/td>\n<td align=\"left\">Negative<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">Sterility Tested<\/td>\n<td align=\"left\">Sterile filtered using 0.22 \u00b5m filter<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">Form<\/td>\n<td align=\"left\">Liquid<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">Shipping Condition<\/td>\n<td align=\"left\">\u00a0Room temperature<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>&nbsp;<\/p>\n<p><strong>Learn more:<\/strong> <a href=\"\/what-is-williams-e-medium\/\">What Is William&#8217;s E Medium?<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Williams&#8217; E Medium &#8211; Max contains L-Alanyl-L-Glutamine, therefore supplying a longer shelf life while significantly improving cell viability and growth. We manufacture several types of Williams&#8217; E Medium based on your requirements.<\/p>\n","protected":false},"featured_media":127457,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[],"product_cat":[283,600],"product_tag":[581,682,666,556,595,545,546],"class_list":["post-105793","product","type-product","status-publish","has-post-thumbnail","product_cat-cell-culture-media","product_cat-williams-e-medium","product_tag-cell-culture","product_tag-glucose","product_tag-l-alanyl-l-glutamine","product_tag-mammalian-cells","product_tag-max","product_tag-phenol-red","product_tag-without-phenol-red","entry","has-media","first","instock","taxable","shipping-taxable","purchasable","product-type-variable","has-product-nav","col","span_1_of_4","owp-content-center","owp-thumbs-layout-horizontal","owp-btn-normal","owp-tabs-layout-horizontal","has-no-thumbnails"],"acf":[],"_links":{"self":[{"href":"https:\/\/purmabiologics.com\/blog\/wp-json\/wp\/v2\/product\/105793","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/purmabiologics.com\/blog\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/purmabiologics.com\/blog\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/purmabiologics.com\/blog\/wp-json\/wp\/v2\/comments?post=105793"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/purmabiologics.com\/blog\/wp-json\/wp\/v2\/media\/127457"}],"wp:attachment":[{"href":"https:\/\/purmabiologics.com\/blog\/wp-json\/wp\/v2\/media?parent=105793"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/purmabiologics.com\/blog\/wp-json\/wp\/v2\/product_brand?post=105793"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/purmabiologics.com\/blog\/wp-json\/wp\/v2\/product_cat?post=105793"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/purmabiologics.com\/blog\/wp-json\/wp\/v2\/product_tag?post=105793"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}