追溯食品產區是近年國際上食品監管的重點之一，利用無機元素分析鑑別農作物產區之技術廣泛地被應用。本研究在探討利用無機元素分析在毛豆產區鑑別之可行性；以不同產區 (台灣雲嘉南、高雄、屏東、中國大陸及日本) 之毛豆為原料，進行無機元素之分析，建立以無機元素來鑑別毛豆產區之統計分析模型。結果顯示，毛豆仁可藉錳、銣、鍶及鋅等4種無機元素含量作為中國大陸與台灣毛豆產區之鑑別參考，另鋇與銣等2種元素含量可作為在日本與台灣毛豆產區之鑑別參考；進一步以鋁、鋇、鉻、錳、鉬、銣、鍶及鋅等8種無機元素含量進行主成分分析 (PCA)，第一主成分 (由鋇、鉻、錳、銣、鍶及鋅所貢獻) 與第二主成分 (由鋁與鉬所貢獻) 共占總變異累積達70.34%，顯示可鑑別台灣與中國大陸的毛豆。此外，毛豆莢也可藉錳與銣等2種無機元素含量作為中國大陸與台灣毛豆產區之鑑別參考，另鋇、銣及鍶等3種元素含量可作為在日本與台灣毛豆產區之鑑別參考；進一步以鋁、鋇、錳、銣、鍶及鋅等6種元素含量進行PCA，第一主成分 (由鋇、錳、銣、鍶及鋅所貢獻) 與第二主成分 (由鋁所貢獻) 共占總變異累積達73.87%，顯示可鑑別台灣與中國大陸昆山的毛豆。若綜合毛豆仁8種與毛豆莢6種無機元素含量進行PCA，第一主成分 (由毛豆仁的鋇、錳、銣、鍶、鋅與毛豆莢的鋇、錳、銣所貢獻) 與第二主成分 (由毛豆仁的鋁與毛豆莢的鍶所貢獻) 共占總變異累積達65.54%，顯示可鑑別台灣與中國大陸或日本的毛豆。故藉由無機元素指紋圖譜技術所建立之鑑別模型，於毛豆產地區分之實際應用上極具可行性。

Tracing the geographical origin of food has been one of the focuses in international food control in recent years, and the use of inorganic element composition analysis to determine the geographical origin of agricultural crops is extremely common. The objective of this study was to investigate the feasibility of identifying the geographical origin of vegetable soybeans using inorganic element fingerprint technology. Vegetable soybeans from different geographical origins (i.e., Yunlin–Chiayi–Tainan, Kaohsiung, Pingtung, China and Japan) were selected as the study materials, and an inorganic element composition analysis was performed. By selecting inorganic elements and determining their content, inorganic element indicators and statistical analysis models were developed for each region to enable users to identify the geographical origin of vegetable soybeans. This allowed users to differentiate between vegetable soybeans produced domestically and abroad as well as vegetable soybeans in different qualities. The study results showed that users can determine whether vegetable soybeans are produced in China or Taiwan by examining the inorganic element content such as manganese, rubidium, strontium and zinc found in the vegetable soybean kernels, users also can determine whether vegetable soybeans are produced in Japan or Taiwan by examining the inorganic content of barium and rubidium in the vegetable soybean kernels. A principal component analysis (PCA) performed using inorganic elements including aluminum, barium, chromium, manganese, molybdenum, rubidium, strontium and zinc revealed that the accumulated variances of the first two principal components accounted for 70.34% of the total variances, indicating that users should be able to differentiate between vegetable soybeans produced in Taiwan and China. Similarly, the study results showed that users can determine whether vegetable soybeans are produced in China or Taiwan by examining the content of manganese and rubidium in the vegetable soybean pods, users also can determine whether vegetable soybeans are produced in Japan or Taiwan by examining the content of barium, rubidium and strontium in the vegetable soybean pods. A PCA conducted using aluminum, barium, manganese, rubidium, strontium and zinc showed that the accumulated variances of the first two principal components accounted for 73.87% of the total variances, signifying that users should be able to differentiate between vegetable soybeans produced in Taiwan and Kunshan, China. Finally, a PCA made by combining the vegetable soybean kernel and pod (in which eight and six inorganic elements were used, respectively) showed that the accumulated variances of the first two principal components accounted for 65.54% of the total variances, suggesting that users should be able to differentiate between soy beans produced in Taiwan, China and Japan.