Winiati Puji Rahayu
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KARAKTERISASI RASA GURIH PADA BEBERAPA PRODUK PANGAN (Characterisation of ‘Gurih’ Taste of Several Food Products) Lula Nadia; Anton Apriyantono; Winiati Puji Rahayu
Jurnal Matematika Sains dan Teknologi Vol. 5 No. 2 (2004)
Publisher : LPPM Universitas Terbuka

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (369.62 KB)

Abstract

The aim of this research was to find the sensory characteristic of ‘gurih’ taste of some food models. Several steps were used to determine: (1) People perception of ‘gurih’, (2) Food ingredients which influence ‘gurih’ taste intensity, and (3) The difference between ‘gurih’ and umami taste. From 1500, 908 questionnaires were returned with complete answer by the participants. Meat, peanut and cheese were chosen as being ‘gurih’ food by 97% of participants. They also perceived that ‘gurih’ taste present in food actually by the contribution of several food ingredients mainly protein, fat, and salt. Use of oil was preferred by 100% of the participants as a type of cooking which could build ‘gurih’ taste in food. Based on participants choice of ‘gurih’ food, meat, peanut and cheese were used as food models. Meat model was made by using hydrolyzed vegetable protein (HVP), chicken fat, and chicken flavor (22.0 : 6.2 : 0.5), peanut model was made by using HVP, peanut oil, corn starch, and carboxy methyl cellulose (27.5 : 42.5 : 20.0 : 2.8); and cheese model was made by using skim milk, milk fat, salt, and cheese flavor (27.5 : 18.0 : 3.2 : 0.5). Using Omission Test for each compound of food model ingredient and t-test to compare the ‘gurih’ level of meat or peanut model, it was found that omitting HVP, salt and chicken fat or peanut oil gave significant lower level of ‘gurih’ of the models than the complete one (p < 0.01). The same result was also found in cheese model, where omitting skim milk, milk fat or salt gave significant lower level of ‘gurih’ of the model than the complete one. It was also found that the omission of protein-rich ingredient (HVP or skim milk) and salt gave significantly lower level of ‘gurih’ taste than the omission of chicken fat, milk fat or peanut oil (p < 0.01). Using the concentration which give 10% stimulus, the intensity of ‘gurih’ taste of food models (0.5% w/v for meat, 0.1% w/v for peanut, and 1% w/v for cheese) was significantly higher than umamis’ models (0.06% w/v for MSG, 0.03 : 0.17 w/v for MSG + salt, 0.03 : 0.17 : 0.11 w/v) (p < 0.01) and was the same with umamis’ models MSG + salt + oil or fat. This finding indicates that the addition of fat was importance to make ‘gurih’ taste to the both model. Meanwhile, there were no research was found that tells the influence of fat on umami taste. In conclusion, ‘gurih’ taste could be found mainly in meat, peanut, and cheese. ‘Gurih’ taste intensity was influenced by several food ingredients. The presence of ‘gurih’ taste was easy to be recognized in food models and the addition of fat in the model make ‘gurih’ taste probably has different taste from umami.
Stabilitas Bakteri Asam Laktat Pada Pembuatan Keju Probiotik Susu Kambing Winiati Puji Rahayu; Triana Setyawardani; nFN Miskiyah
Jurnal Penelitian Pascapanen Pertanian Vol 7, No 2 (2010): Jurnal Penelitian Pascapanen Pertanian
Publisher : Balai Besar Penelitian dan Pengembangan Pascapanen Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jpasca.v7n2.2010.110-117

Abstract

Susu kambing adalah salah satu sumber protein hewani yang berpotensi untuk dikembangkan. Keunggulan susu karnbing antara lain kadar laktosa rendah, ukuran globula lemak yang kecil, kadar MCFA (Medium Chain Fatty Acid) dan kadar nukleotida yang tinggi. Susu kambing juga merupakan sumber isolat bakteri asam laktat (BAL) yang bermanfaat bagi kesehatan. Penelitian ini telah berhasil mengisolasi BAL probiotik Lactobacillus rhamnosus dan Lactobacillus plantarum I selanjutnya digunakan untuk mengbasilkan keju fungsional. Penelitian dikerjakan dalam tiga tahapan, yaitu : (1) pemeliharaan dan persiapan kultur BAL, (2) Pembuatan keju dan uji stabilitas BAL, (3) analisis organoleptik dan proksimat keju. Keju lunak probiotik dengan isolat probiotik L. rhamnosus dan L. plantarum l mempunyai stabilitas BAL selama 4 minggu penyimpanan dengan jumlah BAL 10° log CFU/g. Keju yang dihasilkan mempunyai aroma yang sama dcngan keju kambing komersial, tetapi berbeda tekstur dan rasa (P<0,05) terhadap keju kambing komersial. Tekstur keju lunak probiotik mernpunyai kisaran rataan kekerasan 0,115-0,452 N. Kekerasan tekstur secara statistik berbeda nyata (P<O,05) untuk keju lunak dengan penggunaan BAL probiotik berbeda. Komposisi kimia keju probiotik memiliki kadar air 56,38-60,58%; kadar protein 13,57-17,40%; lemak 17,66-20,42%; dan kadar abu 2,69-3,19%. Stability Of Lactic Acid Bacteria (LAB) In Probiotic Cheese From Goat MilkGoat milk has low content of lactose, high MCFA, protein and nucleotides. in addition, goat milk is the natural source of lactic acid bacteria that have beneficial effect to the health. This research successfully isolated Lactobacillus rhamnosus and L. plantarum I and then applied those bacteria to cheese made from goat milk. This study was done in three stages, i. e. (1) Preparation of lactic acid bacteria culture, (2) probiotic cheese making and stability testing, (3) chemical analysis and sensory test of the probiotic cheese. LAB in isolate probiotic soft cheese with L. rhamnosus and L. plantarum I was viable for 4 weeks of storage with the number of LAB 10° log CFU/g. The flavor of the resulting cheese was similar to that of commercial goat cheese, but its texture and taste were different (P<0.05) from commercial goat cheese. The hardness of probiotic soft cheese ranged from 0.115 to 0.452 N and the value were significantly different (P<0.05) for soft cheese incomporated different probiotic LAB. The chemical composition of probiotic cheese was moisture 56.38-60.58%; protein 13.57-17.40%, fat 17.66-20.42% and ash 2.69-3.19%.