权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Elucidation of deodrant mechanism of bark pophphanols using molecular orbital calcularion

利用分子轨道计算阐明树皮酚的除臭机理

基本信息

批准号：
13660163
负责人：
MITSUNAGA Tohru
金额：
$ 2.11万
依托单位：
Mie University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

We do not feel a disgusting smell in the places growing plants such a forest and a prairie compared to in a city. Absorbing and decomposing abilities of a plant may cause this phenomenon. Especially external tissues such as bark and leaf are considered to be important tissues to fix atmospheric pollutants and carbon dioxide as well as to protect the tree body. In this paper, the deodorant activity of several coniferous barks and proanthocyanidins contained in the bark on ammonia (NH_3) and methyl mercaptan (CH_3SH) were investigated. The deodorant activity was measured with a decicator method using gas detector tube and by GC/MS. Outer bark meals prepared from a Japanese cider and two Japanese pines have strong deodorant activities on NH_3 and reasonably good one on CH_3SH. Their inner bark and wood meals were also tested. The activities of wood meals were extremely lower and that of inner bark meals were the middle of the two tissues without relations of the species. On the other hand proanthocyanidins extracted from bark meal and several polyphenols from tropical wood, green tea and oolong tea showed little or no deodorant activities on CH_3SH. However the polyphenls from persimmon was a reasonably good activity. According to a previous paper, it is considered that the proanthocyanidins in persimmon fruit react with acetaldehyde produced in vivo to convert proanthocyanidins into polymeric polyphenols. In order to mimic the polymerization the condensates of proanthocyanidins from bark with acetaldehyde under acidic condition were synthesized and tested for deodorant activity. The condensates resulted in a large improvement of the activity on both gasses as shown in persimmon polyphenols.

在森林和草原等植物生长的地方，与城市相比，我们不会感到恶心的气味。植物的吸收和分解能力可能导致这种现象。特别是树皮和树叶等外部组织被认为是固定大气污染物和二氧化碳以及保护树体的重要组织。本文研究了几种针叶树皮及其原花青素对氨（NH_3）和甲基氯仿（CH_3SH）的除臭活性。用气相色谱-质谱联用仪（GC/MS）和气体检测管测定了树皮粉的除臭活性。结果表明，由一种日本苹果酒和两种日本松树制备的树皮粉对NH_3有较强的除臭活性，对CH_3SH有较好的除臭活性。他们的内部树皮和木粉也进行了测试。木粉活性极低，树皮粉活性居中，与种属无关。树皮粉原花青素和几种热带木材、绿色茶和乌龙茶多酚对CH_3SH的除臭活性很低或没有。然而，柿子多酚是一个相当好的活性。根据以前的论文，认为柿子果实中的原花青素与体内产生的乙醛反应，将原花青素转化为聚合多酚。为了模拟树皮原花青素与乙醛在酸性条件下的聚合反应，合成了树皮原花青素缩合物，并测试了其除臭活性。如柿子多酚中所示，冷凝物导致对两种气体的活性的大幅改善。