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石榴果汁花青素的稳定性及其护色工艺研究 总被引:8,自引:0,他引:8
研究了石榴果汁花青素在不同条件下的稳定性,并进行了石榴果汁的护色实验。结果表明,石榴果汁花青素在酸性条件下有较好的稳定性;温度、磷酸盐、甜味剂对石榴果汁花青素的稳定性影响不显著;Fe3+,Cu2+能引起花青素的较大损失;在石榴果汁中加入0.4%柠檬酸和0.01%抗坏血酸,可保持稳定的玫瑰红色。 相似文献
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The effects of clarification agents and methods on pomegranate juice quality were studied. Fruits were pressed as whole, and extracted juice was clarified with gelatin, polyvinylypolypyrrolidone (PVPP) and natural sedimentation. In order to determine the effects of these clarifying techniques on product quality, pH, total phenolic substances (TPS), anthocyanin, turbidity, and total colour density tests were applied to each sample. In clarification, the main purpose was to reduce the amount of phenolic substances. Phenolic substances were controlled in each clarification method. The most effective method was the application of 1 g/L gelatine for clarification. Sensory evaluation also applied for clarified juices and gelatin application was selected by panelists to be superior. 相似文献
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石榴的榨汁和护色在石榴汁生产过程中是很重要的工序,直接影响出汁率和产品的品质。对石榴的榨汁和护色方法进行研究表明,剥皮压榨石榴的出汁率和品质明显高于带皮压榨石榴,复合护色剂的护色效果高于单一护色剂,复合护色剂的最佳添加量为0.4g/100g柠檬酸和0.01g/100gVc,石榴汁自然澄清最佳时间为3h。 相似文献
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Effect of daily intake of pomegranate juice on fecal microbiota and feces metabolites from healthy volunteers
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Juana I. Mosele María‐José Gosalbes Alba Macià Laura Rubió Jorge F. Vázquez‐Castellanos Nuria Jiménez Hernández Andrés Moya Amparo Latorre María‐José Motilva 《Molecular nutrition & food research》2015,59(10):1942-1953
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以安徽省蚌埠市怀远县出产的石榴为原料,研究石榴果汁饮料的加工技术,确定了工艺流程、产品配方和最佳工艺参数.结果表明:采用浓度为30%的石榴原汁,8%的白砂糖,0.15%的柠檬酸,2.0%的蜂蜜,0.13%Vc,0.10%黄原胶+0.10%CMC,0.05%的山梨酸钾为配方加工出的石榴果汁,风味最佳.最佳工艺参数为Vc打浆前加入,离心速度为4 000 r/min,离心10 min. 相似文献
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Pedro Álvarez-Cervantes Juan Carlos Cancino-Díaz Héctor Enrique Fabela-Illescas Raquel Cariño-Cortés Edgar Oliver López-Villegas José Alberto Ariza‑Ortega Helen Belefant-Miller Gabriel Betanzos-Cabrera 《International Journal of Food Science & Technology》2021,56(10):5089-5096
Most of the work on pomegranate antioxidant and antibacterial activity has been carried out with solvent extracts of different plant or fruit parts. Biosensitive compounds in juice may be subject to oxidation, reducing their biological activities. Microencapsulation can be used to protect compounds, allowing its incorporation into functional foods. This study aimed at investigating antioxidant activity after in vitro digestion of microencapsulated juice. Pomegranate juice was encapsulated by spray drying its maltodextrin and gum arabic. The average diameter of the microcapsules was 10–50 µm. We evaluated the bioaccessibility of microencapsulated phenolic compounds by using an in vitro enzymatic digestion. The total phenolic content in digested microencapsulated juice was three times greater than in undigested, indicating that the compounds were made bioaccessible. Digestion also increased antioxidant activity, as measured by ABTS●+ or by DPPH●. Additionally, microencapsulated pomegranate juice showed antibacterial activity against the nine bacteria species tested. 相似文献
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Odour-active compounds present in pasteurised orange juice were identified by gas chromatography–olfactometry (GC–O) employing heart-cut multidimensional GC techniques with olfactometry (O) and mass spectrometry (H/C MDGC–O/MS) and comprehensive two-dimensional gas chromatography–accurate mass time-of-flight MS (GC × GC–accTOFMS). Headspace solid phase microextraction sampling proved to be qualitatively adequate for the analysis of pasteurised orange juice. The GC–O approach distinguished 13 potent odour regions (detection frequency ≥ 3) in the orange juice extract, in which 7 regions were then subjected to detailed identification of the compounds that contribute to the odour, by using higher resolution H/C MDGC–O/MS. This analysis permitted the odour-active peaks to be better resolved on the 2D column, with removal from background matrix, for the seven regions. GC × GC–FID and GC × GC–accTOFMS reveal the overall complexity of the volatile compounds in the product and assisted in assignment of the isolated peaks of the odour-active compounds, confirming the identification in a number of cases. Four aldehydes (hexanal, heptanal, octanal, citral), 2 esters (ethyl butanoate, methyl hexanoate), and 4 monoterpenes (α-pinene, D-limonene, linalool, α-terpineol) were confirmed in accordance with olfactometry assessment in the processed juice. This multi-assessment instrument approach of GC–O, GC × GC, and H/C MDGC provided an effective insight into the processed orange juice aroma. 相似文献
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The edible parts of pomegranate fruit represented 52% of total fruit weight, comprising 78% juice and 22% seeds. The fresh juice contained 85.4% moisture, 10.6% total sugars, 1.4% pectin, 0.1 g/100 ml total acidity (as citric acid), 0.7 mg/100 ml ascorbic acid, 19.6 mg/100 ml free amino nitrogen and 0.05 g/100 ml ash. Meanwhile, the seeds are a rich source of total lipids, protein, crude fibers and ash representing 27.2, 13.2, 35.3 and 2.0%, respectively, and also contained 6.0% pectin and 4.7% total sugars. The iron, cupper, sodium, magnesium and zinc contents of the juice were lower than those of seeds, except potassium which was 49.2 ppm in the juice. On the other hand, the physical and chemical properties of seed's lipids indicated that the refractive index was 1.518, melting point 13.0°C, iodine value 74.2, acid number 1.1, unsaponifiable matters 0.7%, saponification value 188.9, ester value 187.8 and glycerol content 10.3%. Moreover, the studied lipids contained 11 fatty acids, from them caprylic, the predominant acid, represented 36.3%, followed by stearic acid (22.5%). Furthermore, oleic and linoleic acids covered 5.1% and 10.3%, respectively. Otherwise, the saturated fatty acids of seed's lipids of pomegranate composed 83.6% of the total fatty acids content. 相似文献
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Fourier transform infrared spectrometer equipped with attenuated total reflection and chemometrics were used to determine added sugar content (ASC), total soluble solids (TSS) and real juice content (RJC) in fresh and commercial mango juice. Sucrose solutions (0-27%), fresh mango juice adulterated with 0-27% sucrose, and two commercial brands were evaluated in wavenumber range of 4000-650 cm−1. Partial least squares (PLS) discrimination and principal component analysis (PCA) were used to classify the samples with or without ASC. PLS and multiple linear regression (MLR) were carried out with and without data treatments. The detection limit for ASC was 3% for samples with low natural TSS, 5% for samples with natural TSS more than 10% and 3.6% for commercial samples. ASC, TSS, and RJC were predicted in the wavenumber range of 1476-912 cm−1 using PLS (multiple correlation coefficient, R = 0.99) and three wavenumbers (1088, 1050, 991 cm−1) using MLR (R = 0.98). 相似文献
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石榴汁花青素的制备与稳定性研究 总被引:2,自引:0,他引:2
研究了石榴汁花青素的稳定性,结果表明:石榴汁花青素的最大吸收波长λmax=516nm;温度对该色素有一定的降解作用,在加工中热处理温度应不高于60℃;pH对该色素的影响明显,宜在酸性食品中应用;柠檬酸对该色素有一定的增色作用;蔗糖、葡萄糖、紫外光照射对该色素影响作用很小;低浓度的苯甲酸钠和山梨酸钾对该色素无影响,高浓度的则有降解作用;而H2O2、Na2SO3、VC和O3则对该色素有破坏作用。 相似文献
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Hossein Mirsaeedghazi Zahra Emam-Djomeh Sayed Mohammad Mousavi Abdolreza Aroujalian & Mahdi Navidbakhsh 《International Journal of Food Science & Technology》2009,44(11):2135-2141
The effect of pressure, velocity, pretreatment, membrane type and pore size on fouling mechanisms were evaluated. Pomegranate juice was treated with polyvinylidene fluoride (PVDF) 0.22 μm and mixed cellulose ester (MCE) 0.1 μm at different pressures. Cake formation which was the dominant mechanism was formed in the first stages of process and, as the filtration proceeded, intermediate, standard, and complete blocking, respectively occurred at higher pressure (5 kPa). At lower pressure (0.5 kPa) the last mechanism did not occur. Results showed that cake formation was the only mechanism in MCE 0.22 μm, however, others occurred with MCE 0.1 μm and PVDF 0.22 μm. Using MCE 0.22 μm prior to MCE 0.025 μm can reduce the role of cake formation in pore blocking. Evaluation of the impact of velocity showed that at the higher velocity (0.53 m s−1 ) the complete blocking occurred faster than at the lower velocity (0.09 m s−1 ). 相似文献