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Abstract
A rapid and label free aflatoxin $ B_1 $ (${{\rm AFB} _1}$) microfluid sensor was proposed and tested. The device was fabricated with hollow-core photonics crystal fiber infiltrated with the ${{\rm AFB} _1}$ solution. The autofluorescence emitting from the ${{\rm AFB} _1}$ molecules was detected. The sensor length was optimized. The ${{\rm AFB} _1}$ concentration was tested with a 4 cm long sensor. The best limit of detection was achieved as low as 1.34 ng/ml, which meets the test requirement of the national standards for ${{\rm AFB} _1}$ in food. The effectiveness of this sensor being applied in beer solution was also verified to be a little more sensitive than in aqueous solution. Compared with traditional ${{\rm AFB} _1}$ detection methods, the proposed single-ended device perfectly satisfies the demand of process control in alcoholic beverages manufacture.
© 2021 Optical Society of America
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