Copigmentation Of Anthocyanin Extract of Purple Sweet Potatoes (Ipomea Batatas L.) Using Ferulic Acid And Tannic Acid

3rd International Conference on Tropical and Coastal Region Eco Development 2017

地球科学;生态环境科学

Susanti, I.^1 ; Wijaya, H.^1 ; Hasanah, F.^1 ; Heryani, S.^1

Center for Agro-based Industry, Jln. Ir. H. Juanda No.11, Bogor

16122, Indonesia^1

关键词: Copigmentation;    Extraction method;    Ferulic acids;    Hyperchromic effect;    Hypochromic effects;    Purple sweet potatoes;    Tannic acid;    Wavelength shift;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/116/1/012006/pdf
DOI  :  10.1088/1755-1315/116/1/012006

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Copigmentation is one of the methods to improve the color stability and intensity of anthocyanin extract. This study aimed to do the copigmentation of the anthocyanin extract of purple sweet potato using ferulic acid and tannic acid. The anthocyanin extraction was conducted with distilled water at pH 7 and pH 2 while the copigmentation was conducted by varying the concentration of ferulic acid and tannic acid. The results showed that best anthocyanin extraction method of the purple sweet potato was using distilled water at pH 2. The yield of freeze dried anthocyanin on the extraction with distilled water at pH 2 was 1710 ppm, while the yield when using distilled water at pH 7 was 888 ppm. Ferulic acid and tannic acid can be used for the copigmentation of anthocyanin extract of purple sweet potato by observing the maximum wavelength shift (bathochromic effect, Δλmax) and increase of color intensity (hyperchromic effect, ΔAmax). The bathochromic effect of ferulic acid began to occur at a concentration of 0.01M, while the hypochromic effect on tannic acid occurred at a concentration of 0.005M and remained up to a concentration of 0.02M. The best copigmentation concentration of ferulic acid was 0.015M, while tannic acid was 0.02M. The use of tannic acid 0.02M is recommended compared to ferulic acid 0.015M because with the same bathocromic effect (Δλmaks = 3,9) results hyperchromic effect (ΔA = 0,258) higher by tannic acid.