Studies on the Deodorizing Actions of Wild Grasses against Offensive Odor.

近年来，我们一直在关注对我们和环境有益且安全的天然物质的利用。野生草容易获得，价格低廉，具有广泛应用的可能性。本研究的目的是：(1)检测野生草对恶臭的去除效果；(2)测定野生草对甲基硫醇（MM）的抑菌和除臭活性；(3)从野生草提取物中分离出活性化合物；(4)研究野生草在食品中的实际应用。所得结果总结如下：1。本试验研究了添加野生牧草对猪小肠贮藏过程中恶臭演变的影响。蒲公英（Taraxacum spp.）对厌氧菌的生长和恶臭的进化抑制效果最好。对不同的常见野草进行了除臭活性筛选试验。美国假雏菊（Eclipta prostrata）、高金枝（Solidago altissima）、红木（Aster subulatus Michx.）、龙木（Altemisia princeps）、白扁虱（Bidens frondosa）、蒲公英、蓟（Cirsium japonicum）和刺蒺藜（Sonchus asper） 8种草具有显著的除臭作用。它们都是compositae家族的成员。部分草提取物能有效抑制变形杆菌的生长。以美国假雏菊和日本结缕草（Reynoutria japonica）活性最高。从牛头草和蒲公英中分离出对MM有脱臭作用的成分。由于这些植物已被用作药物和食品，因此将分离的成分应用于食品可能没有问题。

Recently, we have been paying much interest to the utilization of natural substances which are useful and safe for us and also to the environment. Wild grasses are obtainable easily and inexpensively, and may have a possibility of wide application. The objectives of this study were to: (1) detect the efficiency of wild grasses in reducing the offensive odor, (2) determine their antibacterial effect and deodorant activity against methyl mercaptan (MM), (3) isolate the active compounds from their extracts, (4) investigate the practical application to foods. The results obtained are summarized as follows.1. We studied effects of added wild grasses on the evolution of offensive odor during storage of porcine small intestine. Of the grasses examined dandelion (Taraxacum spp.) inhibited most effectively anaerobe growth and the evolution of offensive odor.2. A screening test for deodorant activity against MM was conducted for different familiar wild grasses. Eight grasses, American false daisy (Eclipta prostrata), tall golden-rod (Solidago altissima), hokigiku (Aster subulatus Michx.), yomogi (Altemisia princeps), begger ticks (Bidens frondosa), dandelion, thistle (Cirsium japonicum) and prickly sow-thistle (Sonchus asper), showed significant deodorizing action. All of them are the family of Composiitae.3. Some of the grass extracts were effective to suppress the growth of Proteus milabilis. The highest activity was found in American false daisy and Japanese knotweed (Reynoutria japonica).4. The constituents which contribute to the deodorizing activity against MM were isolated from dokudami and dandelion. As these plants have been utilized as medicine and food, the application of the isolated components to foods is likely to have no problem.