Abstract:

The business of fragrances has become a multibillion-dollar market, and the development of fragrance tuned technology enriches modern social life. In this study, the inverse machine learning model for fragrance tuned design is proposed. The molecular surface charge density distribution based on the conductor-like screening model (COSMO) is used as the structural descriptor of the fragrance molecule to design the final fragrance tuned product. First, the fragrance attributes are identified and transform attributes into target properties according to needs. Then, change odor scores and establish the Inverse Machine Learning (IML) models, in which the input variables are odors and the output variable is molecular structure descriptor. Based on the trained IML models, the structure descriptors of the potential product are predicted according to the target properties. Finally, the candidate tuned mixtures were screened out using Euclidean-based method in the specified database. In this paper, two types of fragrant examples are taken as examples. The framework is used to design the fragrance, and the experimental data and odor radar map are used to verify the experimental results.

Key words: systems engineering, design, model, inverse machine learning, tuned fragrance, molecular surface charge density distribution

摘要：

香精香料业务拥有数十亿美元的市场，而调香技术的发展丰富了人们的现代社会生活。提出了用于调香设计的反向机器学习模型，采用基于类导体屏蔽模型（COSMO）得到的分子表面电荷密度分布作为香精分子的结构描述符设计最终的调香产品。首先，识别香精属性并根据需求将属性转化为目标性质。然后，调节气味并建立了反向机器学习（inverse machine learning, IML）模型，其中输入变量为气味，输出变量为分子结构描述符，利用训练得到的IML模型，根据目标特性，预测出潜在产品的结构描述符。最后在指定的数据库中通过欧几里得距离法筛选出候选的调香混合物。本文还以两类调香算例为例，利用该框架进行了调香设计，并利用实验数据及气味雷达图对实验结果进行了验证。

关键词: 系统工程, 设计, 模型, 反向机器学习, 调香, 分子表面电荷密度分布