Hao Huang,Qin Xu,Tarun Belwal,Li Li,Halah Aalim,Qiong Wu,Zhenhua Duan,Xuebing Zhang,Zisheng Luo
Purple sweet potatoes are known for its vibrant purple color due to high level of anthocyanins. A polyethylene glycol based ultrasonic-assisted green extraction (PEG-UAE) of anthocyanins from purple sweet potato was proposed. Different types of PEG were tested for anthocyanin extraction along with PEG concentration, liquid-to-solid ratio, ultrasonic temperature and time were investigated for its impact on viscosity and extraction efficiency. The optimum extraction condition, 42 mL/g of ratio, 83% of PEG 200 concentration, 64 °C of ultrasonic temperature and 80 min of sonication time, resulted in better extraction of anthocyanins (83.78 mg CE/100 g DW) and phenolics (994.88 mg GAE/100 g DW). Using UPLC-Triple-TOF/MS, ten anthocyanin and six non-anthocyanin compounds were identified and characterized, with the highest peak area for cyanidin-3-caffeoyl-p-hydroxybenzoyl sophoroside-5-glucoside (25.9%). Moreover, the anthocyanins and phenolics extraction yield along with antioxidant activity were negatively correlated with PEG viscosity, on which ultrasonication has profound effects.
Menglei Yan,Weifei Wang,Qingqing Xu,Qian Zou,Wen Chen,Dongming Lan,Yonghua Wang
The existing oil oxidation detection methods are unsuitable for consumers to identify oil oxidation in a domestic setting. This study aims to develop indicator films detecting the degree of lipid oxidation with the naked eye. Purple sweet potato pigment (PSP) was chosen as a color indicator due to its response to hydrogen peroxide. The novel oxidation indicator films were prepared using corn starch, carboxymethyl cellulose (CMC), and varying concentrations of PSP. Fourier transform infrared spectroscopy spectra and scanning electron microscopy analysis confirmed the successful dispersion of PSP in the films. Thermal stability , light resistance, ultraviolet light resistance, mechanical resistance, and flexibility of films containing PSP were improved, enhancing the potential application in detecting oxidized substances. All the films exhibited noticeable color changes when exposed to different concentrations of hydrogen peroxide. These differences were more pronounced with higher levels of PSP. When these films were used to determine the degree of lipid oxidation, the ∆E value of the CS-PSP-0.25 % film showed a linear relationship (R 2 = 0.929) with the peroxide value, unlike other films. Therefore, it is reliable to infer the peroxide value of edible oil by observing the color of the films, which helps customers avoid consuming expired oils.
Meng Xu,Jia Li,Jinjing Yin,Muci Wu,Wangting Zhou,Xinsun Yang,Rui Zhang,Jingren He
Purple sweet potato (PSP) has abundant nutritional compounds, which are valuable constituents of the human diet, but its development and utilization are still in the primary processing phase. This study examined the differences in nutritional characteristics of 10 PSP varieties. A variety of nutritional components were evaluated and comprehensively compared using principal component analysis (PCA) and cluster analysis (CA). The PSP had 60.9–70.1% moisture. The dried PSP had abundant starch (43.9~67.2%) and dietary fiber (9.40~16.5%), moderate levels of protein (3.19~8.75%) and reducing sugar (1.44~4.01%), and low amounts of crude fat (0.51~1.01%). The anthocyanin profile varied significantly between the different varieties. A correlation analysis showed that a higher content of anthocyanins resulted in a darker color. The PCA and CA suggested that varieties XS, ZL, and JS18 are desirable for developing the diabetic patient’s diet. JS1 had the highest anthocyanin, protein, and dietary fiber contents and the lowest starch, implying that it could be used as a source of natural colorants or functional foods. Varieties FX, GS, ES13, and EN are suitable for producing various starch-based food products, such as noodles, cookies, and pastries. This study provides a reference for the practical use and rational processing of PSP resources.
危险品化学品经营许可证（带存储）