Before agar, microbiologists had experimented with other foodstuffs as microbial media. They turned to substances rich in the starches, proteins, sugars, fats, and minerals that organisms need for growth, testing with broths, bread, potatoes, polenta, egg whites, coagulated blood serums, and gelatine. However, none worked particularly well: all were easily broken down by heat and microbial enzymes, and their surface, once colonized, became mushy and unsuitable for isolating microbes.
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在河南省延津克明面粉有限公司的化验室，工作人员正在用专业仪器测定小麦的面筋含量、面团稳定时间等。公司负责人宋利刚把麦子摊在手心细看，又放进嘴里嚼一嚼，“麦子颜色偏深，硬硬的，嚼着有韧性，一准是强筋麦。”很快，仪器测定结果出来，湿面筋含量32%。