Discrimination of Geographical Origin of Asian Garlic Using Isotopic and Chemical Datasets under Stepwise Principal Component Analysis

Tsang‐Sen Liu; Jhen‐Nan Lin; Tsung‐Ren Peng

doi:10.1111/1556-4029.13731

Discrimination of Geographical Origin of Asian Garlic Using Isotopic and Chemical Datasets under Stepwise Principal Component Analysis

Journal

Journal of Forensic Sciences

Journal Volume

63

Journal Issue

5

Pages

1366-1373

Date Issued

2018-09

Date

2018-09

Author(s)

Tsang‐Sen Liu

Jhen‐Nan Lin

Tsung‐Ren Peng

DOI

10.1111/1556-4029.13731

URI

https://scholars.tari.gov.tw/handle/123456789/6706

Abstract

Isotopic compositions of H-2, O-18, C-13, and N-15 and concentrations of 22 trace elements from garlic samples were analyzed and processed with stepwise principal component analysis (PCA) to discriminate garlic's country of origin among Asian regions including South Korea, Vietnam, Taiwan, and China. Results indicate that there is no single trace-element concentration or isotopic composition that can accomplish the study's purpose and the stepwise PCA approach proposed does allow for discrimination between countries on a regional basis. Sequentially, Step-1 PCA distinguishes garlic's country of origin among Taiwanese, South Korean, and Vietnamese samples; Step-2 PCA discriminates Chinese garlic from South Korean garlic; and Step-3 and Step-4 PCA, Chinese garlic from Vietnamese garlic. In model tests, countries of origin of all audit samples were correctly discriminated by stepwise PCA. Consequently, this study demonstrates that stepwise PCA as applied is a simple and effective approach to discriminating country of origin among Asian garlics.

Subjects

forensic science

discrimination of country of origin for garlic

trace elements

stable isotopes

principal component analysis (PCA)

discrimination model test

Publisher

Wiley

Type

journal article

File(s)

Name

index.html

Size

21.98 KB

Format

HTML

Checksum

(MD5):10cf5ad06b94dac98da231d468491e56