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. 2011 Mar;76(2):C318-23.
doi: 10.1111/j.1750-3841.2010.02023.x.

Antibrowning and antimicrobial activities of the water-soluble extract from pine needles of Cedrus deodara

Wei-Cai Zeng  1 , Li-Rong Jia, Yan Zhang, Jia-Qi Cen, Xi Chen, Hong Gao, Su Feng, Yi-Na Huang
Affiliations

Antibrowning and antimicrobial activities of the water-soluble extract from pine needles of Cedrus deodara

Wei-Cai Zeng et al. J Food Sci. 2011 Mar.

Abstract

The antibrowning and antimicrobial activities of the water-soluble extract from pine needles of Cedrus deodara (CDE), a traditional Chinese medicine and raw materials of pine needle tea, was investigated. Total phenols of CDE were 31.4 ± 0.53 mg gallic acid equivalent/g, and total flavonoids were 23.1 ± 0.79 mg rutin equivalent/g. CDE showed a strong antioxidant activity against ABTS free radicals with IC(50) (the half-inhibitory concentration) of 25.5 ± 0.64 μg/mL. In mushroom tyrosinase inhibitory assay, IC(50) values were 2.1 ± 0.98 and 2.27 ± 0.93 mg/mL for monophenolase and diphenolase, respectively. Evaluated by detecting changes of L* (indicated the darkness of sample), a* (indicated the redness of sample), and b* (indicated the yellowness of sample) values in fresh-cut apple slices model, CDE showed a significant antibrowning effect when compared with ascorbic acid. In addition, it was discovered that CDE in combination with 0.5% ascorbic acid exhibited a synergistic antibrowning effect. Meanwhile, CDE was observed to show a potent antimicrobial effect on all of the tested Gram-positive and Gram-negative bacteria. In conclusion, the results of the present research suggested that pine needles of C. deodara could be used as a natural resource of antibrowning and antimicrobial agents in food preservation.

Practical application: The present study provides a theoretical basis for the potential application of pine needles of C. deodara to be used as a natural resource of antibrowning and antimicrobial agents in food industry.

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