School of Food and Biological Engineering, Jiangsu university, 301 Xuefu Road, 212013 Zhenjiang, Jiangsu, China.
School of Food and Biological Engineering, Jiangsu university, 301 Xuefu Road, 212013 Zhenjiang, Jiangsu, China.
Biosens Bioelectron. 2015 May 15;67:35-41. doi: 10.1016/j.bios.2014.05.040. Epub 2014 Jun 5.
A new room temperature gas sensor was fabricated with pigment-sensitized TiO2 thin film as the sensing layer. Four natural pigments were extracted from spinach (Spinacia oleracea), red radish (Raphanus sativus L), winter jasmine (Jasminum nudiflorum), and black rice (Oryza sativa L. indica) by ethanol. Natural pigment-sensitized TiO2 sensor was prepared by immersing porous TiO2 films in an ethanol solution containing a natural pigment for 24h. The hybrid organic-inorganic formed films here were firstly exposed to atmospheres containing methylamine vapours with concentrations over the range 2-10 ppm at room temperature. The films sensitized by the pigments from black-rice showed an excellent gas-sensitivity to methylamine among the four natural pigments sensitized films due to the anthocyanins. The relative change resistance, S, of the films increased almost linearly with increasing concentrations of methylamine (r=0.931). At last, the black rice pigment sensitized TiO2 thin film was used to determine the biogenic amines generated by pork during storage. The developed films had good sensitivity to analogous gases such as putrscine, and cadaverine that will increase during storage.
一种新型室温气体传感器采用色素敏化 TiO2 薄膜作为敏感层制成。四种天然色素分别从菠菜（Spinacia oleracea）、红萝卜（Raphanus sativus L）、迎春花（Jasminum nudiflorum）和黑米（Oryza sativa L. indica）中用乙醇提取。将多孔 TiO2 薄膜浸入含有天然色素的乙醇溶液中 24 小时，制备天然色素敏化 TiO2 传感器。这里形成的杂化有机-无机薄膜首先在室温下暴露于浓度在 2-10ppm 范围内的甲胺蒸气气氛中。在四种天然色素敏化薄膜中，黑米色素敏化的薄膜对甲胺表现出优异的气体灵敏度，这归因于花色苷。薄膜的相对电阻变化率 S 几乎随甲胺浓度的增加呈线性增加（r=0.931）。最后，用黑米色素敏化的 TiO2 薄膜来测定猪肉在储存过程中产生的生物胺。所开发的薄膜对类似于腐胺和尸胺等在储存过程中会增加的类似气体具有良好的灵敏度。
