共查询到20条相似文献，搜索用时 656 毫秒
1.
荆培培 《农产品加工．学刊》2019,(6)
以牛乳、白砂糖为主要原料,添加圆苞车前子粉,通过乳酸菌发酵获得具有发酵风味的活性乳酸菌饮料。主要研究不同浓度、低pH值、不同温度、不同剪切力对圆苞车前子粉黏度的影响,及其对发酵饮料稳定性的影响。经试验确定圆苞车前子粉添加量为0.8%,采用化料温度50℃,均质压力20 MPa,杀菌温度95℃,杀菌时间5 min等工艺,可制得口感好、稳定性佳的活性乳酸菌饮料产品。 相似文献
2.
嗜酸乳杆菌发酵乳饮料是一种营养丰富且具有保健功能的乳饮料。对嗜酸乳杆菌发酵乳饮料的生产工艺及其稳定性进行了研究。通过正交试验确定出稳定剂的最佳配方用量是:CMC0.2%,果胶0.3%,柠檬酸钠0.05%或CMC0.1%,果胶0.3%,三聚磷酸钠0.1%,柠檬酸钠0.1%。考察了不同均质压力对产品的沉淀率和口感的影响,并对不同均质压力下产品的颗粒分布进行了测试,确定了最佳均质压力为15～20MPa。测定出活菌型产品在温度4℃下贮藏18d,产品中嗜酸乳杆菌的活菌数大于1×106cfu/mL。 相似文献
3.
以复原乳为原料,用柠檬酸将羊奶pH值调节到4.0~4.1,通过测量其热凝固时间(HCT),研究调酸羊奶生产过程中,不同pH值、加酸浓度、加酸温度、均质压力和温度对其热稳定性的影响。结果表明,当乳中蛋白质含量为1%,添加柠檬酸剂量为2 g/L,温度为60℃,压力为30 MPa条件下均质时,酸性羊奶的热稳定性最大。 相似文献
4.
5.
6.
在制备米乳饮料的过程中,采用不同的高压均质工艺参数对米乳饮料进行均质和稳定化,实验结果证明,不同的均质工艺参数对米乳的稳定性影响很大。影响米乳稳定性的主要原因是脂肪球的粒径,当脂肪球粒径为7.343μm时,米乳饮料稳定;脂肪球粒径为0.394μm时,米乳不稳定,脂肪会明显上浮。 相似文献
7.
以蚕豆为主要原料,对调配型酸性蚕豆乳饮料的生产工艺及影响其稳定性的各种因素进行分析,并确定其最佳条件。结果表明:添加剂(复合乳化剂、复合稳定剂和复合磷酸盐)、调酸、均质、杀菌及调配顺序是影响产品稳定性的主要因素。使用一定量的添加剂可以提高产品的稳定性,它们的最佳配比分别为蔗糖脂肪酸酯(SE-15)∶单甘酯=2∶3、魔芋胶∶瓜尔豆胶∶黄原胶=3∶2∶2、六偏磷酸钠∶三聚磷酸钠∶焦磷酸钠=1∶1∶2。酸化工艺选择20～30℃条件下采用滴状或喷雾状加酸,加酸量为0.4%,搅拌速度在不产生气泡的条件下越快越好。均质的最佳条件为20 MPa、60℃,加酸前后各均质一次。采用90℃、5 min高温短时杀菌。最佳调配顺序为先将白砂糖、水、复合乳化剂、复合稳定剂充分溶解混匀,再加入溶解了复合磷酸盐的豆乳与鲜奶混合液,最后用柠檬酸调酸。按此工艺条件产品稳定性最好。 相似文献
8.
9.
《农产品加工．学刊》2017,(13)
为研究预处理、温度等因素对设施栽培葡萄热风干燥效果的影响,以设施栽培的不同葡萄品种为试材,采用不同预处理后进行不同温度的热风干燥,测定失质量率、含水率、色差等指标变化。结果表明,5种不同预处理温度、4种烘干温度条件下,不同设施葡萄品种的失质量率、最终含水率、总色差值在烘干期内变化不同。预处理温度和烘干温度差距、不同的设施栽培葡萄品种,影响葡萄干在烘干过程中品质的变化。 相似文献
10.
11.
《Postharvest Biology and Technology》2004,31(2):159-166
Red fleshed watermelons are an excellent source of the phytochemical lycopene. However, little is known about the stability of lycopene in cut watermelon. In this study, lycopene stability and other quality factors were evaluated in fresh-cut watermelon. Twenty melons each of a seeded (Summer Flavor 800) and a seedless (Sugar Shack) variety were cut into 5 cm cubes and placed in unvented polystyrene containers, sealed, and stored at 2 °C for 2, 7, or 10 days. At each storage interval, melons were evaluated for juice leakage, changes in carotenoid composition, color, soluble solids content (SSC), and titratable acidity. Headspace carbon dioxide and ethylene were monitored during storage intervals. Juice leakage after 10 days of storage averaged 13 and 11% for the seeded and seedless melons, respectively. Lycopene content decreased 6 and 11% after 7 days of storage for Summer Flavor 800 and Sugar Shack melons, respectively. β-Carotene and cis lycopene contents were 2 and 6 mg kg−1 for Summer Flavor 800 and Sugar Shack, respectively, and did not change with storage. After 10 days of storage, CIE L1 values increased while chroma values decreased, indicating a lightening in color and loss of color saturation in melon pieces. Symptoms of chilling injury, such as greatly increased juice leakage, or lesions on cubes, were not seen on the fresh-cut cut watermelon after 10 days storage at 2 °C. Puree pH increased and SSC decreased slightly after storage. Carbon dioxide levels increased and oxygen levels decreased linearly during storage, creating a modified atmosphere of 10 kPa each of CO2 and O2 after 10 days. Fresh-cut cut watermelon held for 7 or more days at 2 °C had a slight loss of SSC, color saturation, and lycopene, most likely caused by senescence. 相似文献
12.
阐述了冰淇淋混合料液老化过程的条件控制及混合料在老化过程中发生的主要变化。经过老化过程,混合料液的黏度显著增加,有助于凝冻过程中的搅打起泡,使冰淇淋产品的质构更加细腻,抗融性和贮藏稳定性更好。 相似文献
13.
豆浆加热程度对内酯凝胶强度的影响 总被引：1，自引：0，他引：1
研究豆浆在不同加热条件下对内酯豆腐凝胶强度和黏度的影响。在相同GDL浓度、保温温度及保温时间的条件下,生豆浆的加热温度及加热时间对内酯豆腐凝胶网络结构有着重要影响:生豆浆在温度95￣100℃加热10min,制得内酯豆腐的凝胶强度最好;生豆浆的加热温度在75℃以下时,无凝胶产生,只有絮状沉淀,且黏度随加热温度和加热时间的增加而增加。 相似文献
14.
为研究胶对混浊苹果汁混浊稳定性的影响。采用HCLP和SDS-PAGE等技术分析了果汁沉淀物的成份、沉淀物中酚类物质和蛋白质的性质，测定加了胶的果汁的黏度、Zeta电位和果汁在120d的储藏过程中浊度的变化。果汁沉淀物以蛋白质为主，还含有碳水化合物、酚类（表儿茶素、绿原酸、单宁等）、5-羟甲基糠醛（5-HMF）等VC降解产物，成分很复杂。沉淀物主要是由果汁中原有的颗粒聚集长大下沉产生。混浊苹果汁的混浊稳定性可进一步通过添加0.05%（W/V）的CMC得以改善。CMC主要是通过提高果汁的粘度和果汁中悬浮颗粒的zeta电位来改善混浊苹果汁的混浊稳定性。添加瓜尔胶主要是通过提高果汁的粘度来改善混浊苹果汁的混浊稳定性。 相似文献
15.
Plant oil emulsion modifies internal atmosphere, delays fruit ripening, and inhibits internal browning in Chinese pears 总被引：2，自引：0，他引：2
'Laiyang Chili’ and ‘Ya Li’ (Pyrus bertschneideri Reld) pears were treated with 3, 6, and 9% emulsions of commercial or refined (reduced -tocopherol levels) plant (soybean, corn, peanut, linseed, and cottonseed) oils at harvest an stored at 0°C for 6 months. Effects of oil treatments on ethylene production, respiration, fruit firmness, fruit color, soluble solid content (SSC), titratable acids (TA), internal browning (IB), and internal CO2, O2, and ethanol were studied. At the same concentration, oil treatments induced similar responses regardless of their sources or their -tocopherol concentrations. In both cultivars, ethylene production and respiration in fruit treated with 9% oils were lower in early storage and higher in late storage than that in the controls. Oils at 6% reduced IB, at 9% inhibited IB completely, and at 3% was not effective after 6 months at 0°C and 7 days at 20°C. Plant oil treatment maintained fruit color, firmness, SSC, and TA in a concentration-dependent manner during storage. In the first 4 months storage, 9% corn oil-treated fruit contained similar partial pressure of CO2 and O2 as the controls. After 5 months storage, oil-treated fruit contained higher partial pressure of CO2 and lower levels of O2 than the controls. When held at 20°C for 7 days, changes of internal CO2 and O2 were slower but partial pressure of CO2 were higher, and O2 were lower, in 9% corn oil-treated fruit than in the controls. Internal ethanol was not affected by oil treatment compared with control, either during storage or 7 days at 20°C. No off-flavor was detected in either oil-treated and control fruit by sensory evaluation. 相似文献
16.
荔枝酒储藏期间非酶褐变因素影响研究 总被引：1，自引：1，他引：0
色泽不稳定是荔枝酒生产遇到的常见问题。采用紫外分光光度计与色差计,研究了36d储存期非酶褐变因素对荔枝酒褐变度以及荔枝酒亮度的影响。结果表明,荔枝酒储藏期间,温度、糖度、氧气量和光照强度都与荔枝酒的褐变度成正比,与荔枝酒的透明度成反比关系。低糖度的荔枝酒在密封瓶装并置于4℃低温条件下保存36d后,在波长420nm下的吸光度只增加0.003,亮度仅降低0.58,很好地抑制了荔枝酒非酶褐变的反应速率。 相似文献
17.
18.
选用5个同一生产年度的不同品种小麦,在同一储藏条件下对其容重、水分、面筋吸水量、粘度、降落数值和发芽率等品质指标进行测定,讨论各指标与储藏时间的关系及品种差异对各指标的影响,分析各指标之间的相关性。结果显示:随着储藏时间的延长,小麦容重、水分和粘度的变化趋于稳定,面筋吸水率和发芽率呈降低趋势,降落数值呈增大趋势;不同小麦品种的容重、发芽率变化差异不大;储藏1年后,不同小麦品种的水分、面筋吸水率、降落数值变化差异较大;容重与其它五个指标都存在一定的相关性,这也是选择容重作为小麦等级鉴定的必要性。 相似文献
19.
20.
The effects of different modified atmosphere packaging (MAP) on antioxidant compounds and storage quality of ‘Hicrannar’ sweet pomegranates were investigated during long term storage. Pomegranates were harvested at the commercial harvest stage and packed in two different types of MAP (MAP1 and MAP2). After packaging, all fruit were stored at 6 °C and 90–95% RH for 120 days, then removed from storage for different quality analyses. Some fruit were kept at 20 °C for 3 days to simulate a period of shelf-life. Fruit weight loss, decay index, skin color, total titratable acidity, total soluble solids content, total phenolics, total anthocyanins and antioxidant activity were determined. Internal atmospheres created by the MAP were periodically assessed during cold storage, and CO2 concentrations increased and O2 concentrations decreased inside the MAP. MAP significantly reduced weight loss after both 120 days of cold storage and shelf-life. MAP2 was the most effective packaging in reducing weight loss. Storage of pomegranates in MAP also reduced decay and the decay index, and maintained visual appearance compared to control fruit. During storage, a decrease in L* and C* values and an increase in h° values were observed in all treatments. However, fruit stored in MAP2 had higher L*, C* and lower h° values than in other treatments. Titratable acidity and total soluble solids decreased after cold storage and shelf-life, and no significant differences among treatments were found. Total phenolics, total anthocyanin contents and antioxidant activity increased during the storage period in control fruit. 相似文献