Volatile organic compounds gas sensor based on quartz crystal microbalance for fruit freshness detection: A review

In this review article, the state of the art of gas sensors based on quartz crystal microbalance (QCM) for fruit freshness detection is overviewed from the aspects of development history, working principle, selection and modification of sensitive materials, and volatile organic compounds detection of fruits. According to the characteristics of respiratory intensity at the stage of fruit ripening, fruits can be divided into respiration climacteric fruits and non-climacteric fruits. In recent years, research has mainly focused on respiration climacteric fruits, such as bananas and mangoes, etc., while related studies on non-climacteric fruits have been rarely reported, except for citrus fruits. The preparation methods and structure design of sensitive materials based on physical/ chemical adsorption mechanisms are further discussed according to the odor components that affect the freshness of fruits, namely alkenes, esters, aldehydes and alcohols.

Automated summary

This review article provides an overview of gas sensors based on quartz crystal microbalance for fruit freshness detection, focusing mainly on research on respiration climacteric fruits and discussing the sensitive materials based on physical/chemical adsorption mechanisms. The characteristics of fruits' respiratory intensity at the stage of ripening are considered for dividing fruits into respiration climacteric and non-climacteric categories.