Quality and Antioxidant Activity of Yogurt Supplemented with Roselle During Cold Storage

The purpose of this study was to determine the quality (physical, chemical, microbiological characteristics), total phenolic content, and antioxidant activity using 1,1-diphenyl-2-picrylhydrazyl radical (DPPH) inhibition assay of probiotic yogurt supplemented with roselle flower extract (Hibiscus sabdariffa L) during cold storage. The experiment used treatment for types of yogurt as follows: cow's milk probiotic yogurt + roselle, goat's milk probiotic yogurt + roselle, cow's milk yogurt, and goat's milk yogurt. The yogurt was stored in cold storage and evaluated the quality and antioxidant activity variables on days 0, 3, 6, 9, 12, and 15th. The results showed that there were interaction (P<0.05) between types of yogurt and storage time on pH value and total lactic acid bacteria (LAB), but no interaction effect on viscosity. The types of yogurt significantly affected (P<0.05) aw, total titrable acid (TTA), total phenolic content, and antioxidant activity. Cow's milk probiotic yogurt + roselle and goat's milk probiotic yogurt + roselle were the best yogurt that contributed to a good quality and high antioxidant activity up to 15 d at cold storage

Identification of students' mental models about the milk transformation in yogurt

A review of the scientific literature reveals that there are still few researches on the conceptions of secondary school students about chemical reactions involving microorganisms, especially those related to the mental models that students use in their explanations. This paper describes a study concerning the different mental models related to the milk transformation into yogurt with 83 students from a Spanish secondary school of 8th and 9th grade (13-16 years) developed in the framework of a research that intends to use the elaboration of this product as a context for the teaching and learning of chemical reactions through modeling approaches. In order to identify the mental models of the students, in this paper we consider the milk transformation into yogurt as a process in which its main components are: the entities involved (milk and bacteria), the interaction between them and the result (yogurt). A simplified school model of this process would involve students considering that bacteria use the sugar in milk to transform it into lactic acid through a chemical reaction to obtain the necessary energy. Using this scheme in interaction with the students' answers, the underlying mental models were identified. Although almost half of the students showed great difficulties explaining the process, five models have been identified. Students often consider the milk transformation into yogurt primarily as a physical process of agglutination or change of state. These models are far from a school model of reference in which the bacteria have a fundamental role in the transformation of milk into yogurt by a chemical reaction.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Quality and Antioxidant Activity of Yogurt Supplemented with Roselle during Cold Storage

The purpose of this study was to determine the quality (physical, chemical, microbiological characteristics), total phenolic content, and antioxidant activity using 1,1-diphenyl-2-picrylhydrazyl radical (DPPH) inhibition assay of probiotic yogurt supplemented with roselle flower extract (Hibiscus sabdariffa L) during cold storage. The experiment used treatment for types of yogurt as follows: cow’s milk probiotic yogurt + roselle, goat’s milk probiotic yogurt + roselle, cow’s milk yogurt, and goat’s milk yogurt. The yogurt was stored in cold storage and evaluated the quality and antioxidant activity variables on days 0, 3, 6, 9, 12, and 15th. The results showed that there were interaction (P<0.05) between types of yogurt and storage time on pH value and total lactic acid bacteria (LAB), but no interaction effect on viscosity. The types of yogurt significantly affected (P<0.05) aw, total titrable acid (TTA), total phenolic content, and antioxidant activity. Cow’s milk probiotic yogurt + roselle and goat’s milk probiotic yogurt + roselle were the best yogurt that contributed to a good quality and high antioxidant activity up to 15 d at cold storage

Investigation of the effect of probiotic yogurt and fenugreek on allergic asthma

Background: Asthma as the variable degrees of airway obstruction is reversible and allergic asthma is a common form of asthma. Yogurt is coagulated milk and fenugreek as a plant is used in traditional medicine. Oral administration of yogurt (as food) can provide probiotic agents that have the main effects on immune responses. In this study, the effect of yogurt and fenugreek on asthma was studied.  Materials and Methods: After producing of asthma model in BALB/c mice in 4 groups, groups were treated with yogurt, yogurt-probiotics, and yogurt-fenugreek. At least, total IgE in serum, IL-4, 5, 13 in BAL (Broncho-Alveolar lavage) fluid was measured. Histopathological sections were prepared and eosinophilic infiltration and mucus-secreting were investigated. Results: Eosinophilic infiltration and mucus hyper-secretion were decreased in treated groups. Total IgE in serum was decreased in asthma-yogurt-probiotic and asthma-yogurt-fenugreek groups in comparison with asthmatic and asthma-yogurt groups. The amount of IL-4 in BAL of the asthma-yogurt-fenugreek group was decreased. The amount of IL-5 in BAL of the asthma-yogurt-probiotic and asthma-yogurt-fenugreek groups was decreased. The amount of IL-13 was decreased significantly in three treated groups. Conclusion: This study showed that yogurt with fenugreek and probiotic has a strong effect on suppression of progression of airway inflammation and asthma pathophysiology.   &nbsp

A review of factors influencing the quality and sensory evaluation techniques applied to Greek yogurt

Greek yogurt is one of the fastest growing products in the dairy industry. It is also known as strained yogurt, which is obtained after draining the whey. As a result of the draining process, Greek yogurt has higher total solids and lower lactose than regular yogurt. Since it is a concentrated yogurt, its sensory characteristics are different from regular yogurt. However, there is little information about factors influencing the quality of Greek yogurt and sensory evaluation techniques applied to Greek yogurt. This review aims to describe the effects of ingredients, starter cultures, processing techniques and other parameters on quality characteristics and sensory properties of Greek yogurt. In addition, advantages and limitations of novel sensory evaluation techniques applied to Greek yogurt products are discussed. In particular, we take a look at advanced techniques such as the electronic nose and electronic tongue and the benefits of these techniques with regard to Greek yogurt. This review should help the Greek yogurt industry to improve its current products and develop innovative products based on appropriate food evaluation techniques.National Institute of Food and Agriculture (NIFA) | Ref. NC.X308-5-18-170-1San Jose State University | Ref. CA 95192North Carolina Agricultural and Technical State University | Ref. 2741

Potensi Hipolipidemik Yogurt dari Isolat Protein Biji Kecipir (Psophocarpus Tetragonolobus) pada Tikus Hiperkolesterol dengan Perlakuan Jumlah Pakan

Biji kecipir memiliki kadar protein yang hampir sama dengan kedelai, namun bau langunya lebih tajam daripada kedelai, sehingga perlu diisolasi proteinnya sebelum digunakan sebagai bahan baku yogurt. Tujuan penelitian ini adalah menentukan potensi hipokolesterolemik yogurt isolat proteun biji kecipir melalui uji biologis in vivo menggunakan tikus jantan Sprague Dawley. Perlakuan penelitian ini adalah perlakuan pakan yogurt dengan konsentrasi 0 (pakan standar tanpa penambahan yogurt sebagai kontrol), 2, dan 4 g yogurt/hari berturut-turut sebagai perlakuan konsentrasi rendah dan tinggi selama 4 minggu perlakuan pakan yogurt sesudah pemberian pakan hiperkolesterol selama 1 minggu. Profil lipida darah tikus meliputi kadar trigliserida, total kolesterol, kolesterol High Density Lipoprotein (HDL), dan Low Density Lipoprotein (LDL) dianalisis pada minggu ke 2 dan 4 minggu selama perlakuan pakan yogurt dan sebelum perlakuan pakan yogurt yaitu pada fase pemeliharaan adaptasi dan 1 minggu pada fase pemeliharan hiperkolesterol. Hasil penelitian ini menunjukkan bahwa trigliserida, total kolesterol, dan kolesterol LDL meningkat dan kolesterol HDL menurun selama fase pemberian pakan hiperkolesterol sebelum perlakuan pakan yogurt. Potensi hipokolesterol yogurt isolat protein biji kecipir ditunjukkan dengan penurunan trigliserida, total kolesterol, dan kolesterol LDL, serta peningkatan kolesterol HDL sesudah perlakuan pakan yogurt dengan konsentrasi rendah maupun tinggi. Hal tersebut mengindikasikan bahwa yogurt isolat protein biji kecipir mampu menurunkan kolesterol

Influence of added lactose on probiotic properties of yogurt culture bacteria and yogurt characteristics

Lactose sugar is a source of energy for Lactic Acid Bacteria (LAB) in dairy fermented products. Enrichment of yogurt with lactose addition may increase growth and viability of the yogurt starter culture (Streptococcus thermophilus and Lactobacillus delbrueckii ssp. bulgaricus) and enhance yogurt physico-chemical and sensory attributes. The objectives of this study were: to determine the influence of added lactose on (1) acid and bile tolerance of yogurt starter culture Streptococcus thermophilus ST-M5 and Lactobacillus bulgaricus LB-12, (2) the final lactose content of yogurt during its shelf life, (3) the physico-chemical characteristics of yogurt during shelf life, (4) the growth of the yogurt starter culture during yogurt´s shelf life and (5) the sensory attributes of yogurt. Acid tolerance test was conducted on pure culture at 30 minutes intervals for 2 hours of incubation period and bile tolerance at 1 hour intervals during 12 hours. Fat free plain set-type yogurt was manufactured using 0, 1, 3 and 5% w/w added lactose to accomplish objectives 2, 3 and 4. For objective 5, a blueberry yogurt was manufactured using the same lactose levels. Analyses for plain set-type yogurt were done at 7 days intervals during 35 days of storage period. Sensory evaluation was conducted on yogurt 3 days after its manufacture. Data were analyzed using Proc Mixed model of SAS® 9.3 program and by analysis of variance (ANOVA) using Proc GLM. Significant differences between means were analyzed at α = 0.05 using Tukey´s adjustment. Lactose had a positive effect on acid tolerance and bile tolerance of both yogurt starter cultures, growth of S. thermophilus and sensory attributes of flavored yogurt. Mean overall liking scores were higher for samples containing added lactose compared to control as tested by 100 panelists. Lactose supplementation in yogurt might be a good approach to increase its health benefits, acceptability and purchase intent among consumers

Sensory Evaluation of Moringa-Probiotic Yogurt Containing Banana, Sweet Potato or Avocado

This study evaluated the effects of adding selected fruits and vegetables local to Mwanza, Tanzania on the sensory qualities of probiotic yogurt supplemented with Moringa oleifera, a local tree with a high micronutrient and protein content. A total of five samples were evaluated: 1) Probiotic yogurt (control), 2) Moringa probiotic yogurt, 3) Moringa-banana probiotic yogurt, 4) Moringa-sweet potato probiotic yogurt, and 5) Moringa- avocado probiotic yogurt. Consumers (n= 37) rated the five different samples on a 9-point hedonic scale for four sensory characteristics (flavour, appearance, texture and overall quality). The control sample and the Moringa-banana sample had significantly higher ratings (p0.05). Overall, the addition of banana to Moringa probiotic yogurt resulted in a product with comparable sensory qualities to probiotic yogurt alone

INOVASI PRODUK YOGURT RASA BUAH CAMPOLAY DAN PEYULUHAN MANAJEMEN PEMASARAN DI UMKM SABILULUNGAN

Yogurt dengan varian rasa buah cenderung lebih disukai oleh konsumen dibandingkan dengan yogurt original atau plain. Tujuan dari kegiatan pengabdian ini adalah untuk mengembangkan varian rasa buah pada yogurt UMKM Sabilulungan dengan menambahkan rasa buah campolay serta meningkatkan pengetahuan dari kegiatan pemasaran untuk produk yogurt. Metode dalam kegiatan pengabdian ini meliputi pengujian trial penambahan serbuk campolay ke dalam produk yogurt, pelatihan pembuatan yogurt rasa buah campolay bersama UMKM Sabilulungan, dan penyuluhan kegiatan pemasaran dari suatu produk inovasi. Hasil pengabdian menunjukkan bahwa produk yogurt dengan penambahan 10% serbuk campolay memiliki rasa yogurt dengan rasa campolay yang terasa, tidak terdeteksi aftertaste, dan aroma buah campolay yang mild tanpa bau langu. Setelah mendapatkan persentase serbuk campolay berdasarkan trial sebelumnya, kemudian dilakukan kegiatan pelatihan pembuatan yogurt dengan penambahan serbuk campolay terpilih. Sebelum dilakukan pelatihan, hasil post-test yang dilakukan menunjukkan bahwa terdapat peningkatan pengetahuan mengenai karakteristik dan manfaat buah campolay dan peningkatan pengetahuan terkait kegiatan pemasaran. Beberapa pertanyaan dalam kuisioner khususnya terkait manajemen pemasaran belum secara baik dapat dipahami oleh pelaku UMKM.. Pelatihan yang dilakukan dapat menarik antusias pelaku UMKM, di mana mereka dapat mengembangkan varian rasa buah campolay pada yogurt yang sudah ada. Saat ini yogurt UMKM Sabilulungan memiliki 4 varian rasa buah, yaitu durian, melon, stroberi, dan campolay. Secara keseluruhan, kegiatan pengabdian ini berjalan dengan baik dan sesuai dengan rencana kegiatan serta dapat mengembangkan produk yogurt yang kemudian diharapkan dapat meningkatkan penjualan produk

THE COMMERCIAL POTENTIAL OF NEW DAIRY PRODUCTS FROM MEMBRANE TECHNOLOGY

Membrane filtration technologies are capable of creating entirely new, more functional food products. In this regard, potential new dairy products include high-protein, low-lactose fluid milk, high-protein, low-lactose ice cream, and non-far yogurt made with fewer stabilizers. An initial survey of membrane manufacturing companies determined the added cost to produce such functional food products to be two to six percent of the existing retail price for similar standard dairy products. A subsequent survey of milk processors found that the most likely adopters of such membrane technologies were yogurt manufacturers.Agribusiness,