Abstract
A few importers of marine products have practiced the fraud of artificially injecting water intoOctopus minorfor increasing their weights prior to the freezing process. These rampant practices have recently become a serious social issue and threaten public health. Therefore, it is necessary to develop the detection method for artificially water-injected frozenOctopus minor. This study was conducted to develop the nondestructive method for verifying adulteratedOctopus minorby measuring dielectric properties using the coaxial probe method. Regardless of weight and measurement locations, a significant difference betweenεvalues from normal octopuses was not observed. Theεvalues ofOctopus minorwere decreased in the microwave frequency range between 500 and 3000 MHz. Theεvalues of water-injected octopuses also showed similar trend with normal octopuses; however, the dielectric loss factor (ε″) values of adulterated octopuses were much lower than normal octopuses. After thawing normal, adulterated, and imported frozenOctopus minor, theεvalues measured at the trunk part from these octopuses were compared and statistically analyzed. Theε″values from normal frozen octopus were significantly different from adulterated and imported frozen octopuses. In addition, theε″values from the adulterated frozen octopus group that weight gain rate was less than 20% was significantly different from other adulterated octopus groups with higher weight gain rate than 20%. Theε″values from adulterated frozen octopus groups with the range of weight gain rate between 20 and 30% were quite similar to imported frozen octopuses. Therefore, it was found that the measurement ofε″values fromOctopus minorhas a great possibility to distinguish normal frozen octopuses and artificially water-injected frozen octopuses.
Highlights
Octopus minor (Sasaki, 1920), which is widely distributed along the coastal waters of Korea, China, and Japan, is one of commercially important marine species in East Asia countries [1]
Because the majority of imported octopuses are in the frozen state and their price is mainly decided by the weight, a few of importers of marine products have practiced excessive ice glazing of frozen fish and forced water injection into octopus for increasing weights of marine products. is rampant practice threatens public health and became a social issue in Korea
As far as can be determined from published literatures, there was not an attempt to determine how much water were artificially injected into octopus by measuring dielectric properties with the open-ended coaxial probe method. erefore, this study was conducted to (1) distinguish normal and artificially water-injected Octopus minor (Sasaki, 1920) by measuring dielectric properties and (2) develop the nondestructive detection method verifying artificially water-injected frozen Octopus minor by using the open-ended coaxial probe
Summary
Detection of Artificially Water-Injected Frozen Octopus minor (Sasaki) Using Dielectric Properties. A few importers of marine products have practiced the fraud of artificially injecting water into Octopus minor for increasing their weights prior to the freezing process. Erefore, it is necessary to develop the detection method for artificially water-injected frozen Octopus minor. After thawing normal, adulterated, and imported frozen Octopus minor, the ε values measured at the trunk part from these octopuses were compared and statistically analyzed. E ε′′ values from normal frozen octopus were significantly different from adulterated and imported frozen octopuses. E ε′′ values from adulterated frozen octopus groups with the range of weight gain rate between 20 and 30% were quite similar to imported frozen octopuses. Erefore, it was found that the measurement of ε′′ values from Octopus minor has a great possibility to distinguish normal frozen octopuses and artificially water-injected frozen octopuses The ε′′ values from the adulterated frozen octopus group that weight gain rate was less than 20% was significantly different from other adulterated octopus groups with higher weight gain rate than 20%. e ε′′ values from adulterated frozen octopus groups with the range of weight gain rate between 20 and 30% were quite similar to imported frozen octopuses. erefore, it was found that the measurement of ε′′ values from Octopus minor has a great possibility to distinguish normal frozen octopuses and artificially water-injected frozen octopuses
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