棉毛巾在UVB照射后的挥发性气体成分分析#br#

摘要/Abstract

摘要： 为分析棉毛巾在UVB-313紫外光源照射后的气体成分，采用顶空固相微萃取-气相色谱-质谱联用法（HS-SPME-GCMS）对棉毛巾的挥发性气体进行萃取和检测。通过NIST谱库检索对气体定性，峰面积归一化法确定气体的相对百分含量，结合相对气味活度值法（ROAV）确定某成分的气味特征和总体贡献。结果表明：不同辐照度及辐照时间处理后的棉毛巾共鉴定出6种挥发性气体物质，包括醛类2种，醇类1种，烷烃类3种，且壬醛、癸醛和十八烷是UVB照射后棉毛巾的主体气味物质，最后构建了辐照度和辐照时间与壬醛相对百分含量的多元线性回归方程。研究结果可为芳香医疗卫生及家用棉制纺织品的开发提供参考。

关键词: 棉毛巾, 气体成分, 紫外照射, 固相微萃取, 气相色谱-质谱联用, 相对气味活度值

Abstract: The current studies on the effects of UV light on cotton towels mainly focus on the changes of their surface morphology and physicochemical properties, and there are fewer studies on the volatile gases of cotton towels under the irradiation of UV light source. To study the gas composition of cotton towels after UVB-313 irradiation, the volatile gases of cotton towels were extracted and detected by headspace solid-phase microextraction coupled with HS-SPME-GCMS.
Pre-treatment with solid-phase microextraction is required to enrich and concentrate the gases to be measured before gas detection, and the extraction conditions largely affect the extraction effect of the gases. To improve the extraction efficiency of the sample, the parameters of extraction time and extraction temperature of the pretreatment were optimized in this experiment before the gas test, and the pretreatment time of 60 min and the pretreatment temperature of 50 ℃ were determined.
The volatile gases of cotton towels after UVB-313 irradiation for different irradiance levels and irradiation times were tested by HS-SPME-GCMS, respectively, and the total ion chromatograph of the samples was obtained by choosing the SCAN full scan format for the test. The GCMS solution workstation was used to process the sample data, and the mass spectra of the tested samples were compared with the standard mass spectra in the NIST library, and the substances with a match of 75% and above were selected as their qualitative results.
The results showed that the gas composition produced at different irradiance levels varied for the same irradiation time. Six volatile gas substances including two aldehydes, one alcohol and three alkanes were produced at 7 W/m2 irradiance, two aldehydes at 5 W/m2 irradiance and only nonanal at 3 W/m2 irradiance.
The odor activity value (ROAV) method was used to evaluate the contribution of the gas to the overall flavor of the samples by combining the relative percentages of gas components and odor threshold values. The two substances that mainly contributed to the aroma of the samples were analyzed to be nonanal with fat and rose fragrance and decanal with strong sweet and fruity fragrance of all the volatile gas components produced by cotton towels after 3 h irradiation by UVB-313 ultraviolet light source with 7 W/m2 irradiance.
Finally, irradiance and irradiation duration were used as independent variables and the relative percentage content of nonanal as dependent variables, which were modeled by a binary linear regression model, and the analysis of the model parameters showed that there was a significant linear relationship between the relative percentage content of nonanal and irradiance and irradiation duration, and the influence of irradiance on the content of nonanal was greater as shown by the standardized coefficients.

Key words: cotton towel, gas composition, UV irradiation, SPME, GC-MS, relative odor activity values

中图分类号:

TS116

李可馨, 孟粉叶, 罗国和, 杨旭东, 胡吉永. 棉毛巾在UVB照射后的挥发性气体成分分析#br#[J]. 现代纺织技术, 2023, 31(6): 138-144.

LI Kexin, MENG Fenye, LUO Guohe, YANG Xudong, HU Jiyong. Analysis of volatile gas composition of cotton towels after UVB irradiation[J]. Advanced Textile Technology, 2023, 31(6): 138-144.

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