Riyanto Riyanto
Universitas Mercu Buana Yogyakarta

Published : 4 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 4 Documents
Search

Kondisi Kritis dan Stabilitas Aktivitas Antioksidatif Minuman Gel Lidah Buaya (Aloe vera var. chinensis) selama Penyimpanan Chatarina Wariyah; Riyanto Riyanto; Muhamad Salwandri
agriTECH Vol 34, No 2 (2014)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (186.46 KB) | DOI: 10.22146/agritech.9500

Abstract

Aloe vera contains a flavonoid compound which has functional property as an antioxidant. Previous study has shown that aloe vera gel drink, a product of aloe vera, has high antioxidative activity, but the stability of the antioxidative activity during storage has not been known yet. The purpose of this research was to determine the critical condition and the antioxidative activity of aloe vera gel drink during storage. Specifically, the purposes of this research were to  determine the critical condition of the aloe vera gel drink, to evaluate the chemical and physical properties of the aloe vera gel drink when packaged with polypropylene film until critical condition was reached, to evaluate the changes in antioxidative activity during storage and to determine the storage life of the aloe vera gel drink based on the critical condition and the antioxidative activity. The results showed that the critical condition of aloe vera gel drink was determined by increasing the titratable acidity and the critical properties were determined by its odor and sour taste. The characterictics of the aloe vera gel drink at the critical condition were titratable acidity 0.12+0.01% (wb) and sugar 7.43+0.09 % (wb), at a sugar/acid ratio of  61.92. The aloe vera gel drink packaged with 0.4 mm polyethylene film had a storage life of one week. The antioxidative activity of fresh aloe vera gel drink had a RSA percentage of 27.71% and lipid peroxidation inhibition of 6.30%. After a week in storage, the RSA decreased to 21.98% and lipid peroxidation inhibition became 5.63%.ABSTRAKLidah buaya mengandung senyawa flavonoid yang memiliki sifat fungsional sebagai antioksidan. Pengolahan lidah buaya menjadi produk minuman gel lidah buaya telah dilakukan sebelumnya dan hasilnya menunjukkan aktivitas antioksidasi cukup tinggi. Namun sampai saat ini stabilitas aktivitas antioksidasi minuman gel lidah buaya selama penyimpanan belum diketahui. Tujuan penelitian ini adalah menentukan kondisi dan sifat kritis minuman gel lidah buaya dan mengevaluasi stabilitas sifat antioksidasi selama penyimpanan. Secara khusus tujuannya adalah menentukan kondisi kritis minuman gel lidah buaya, mengevaluasi perubahan kimia dan fisik minuman gel lidah buaya dalam kemasan plastik sampai mencapai kondisi kritis, mengevaluasi perubahan aktivitas antioksidasi secara periodik selama penyimpanan, dan menentukan daya simpan minuman gel lidah buaya berdasarkan kondisi kritis dan aktivitas antioksidasinya. Hasil penelitian menunjukkan bahwa kondisi kritis minuman gel lidah buaya ditentukan oleh peningkatan keasaman dan sifat kritis ditentukan oleh perubahan bau dan munculnya rasa masam. Secara khusus kesimpulannya adalah kondisi kritis minuman gel lidah buaya terjadi pada keasaman tertitrasi 0,12+0,01%(bb), kadar gula 7,43+0,09 % (bb), pada rasio gula/asam 61,92. Minuman gel lidah buaya dalam kemasan plastik poliethilen 0,4 mm daya simpannya satu minggu. Aktivitas antioksidasi minuman gel lidah buaya segar adalah dengan nilai Radical Scavenger Activity (RSA) 27,71% dan penghambatan peroksidasi lemak 6,30%. Setelah penyimpanan satu minggu nilai RSA turun menjadi 21,98% dan penghambatan peroksidasi lemak 5,63%.
Stabilitas Sifat Antioksidatif Lidah Buaya (Aloe vera var. chinensis) selama Pengolahan Minuman Lidah Buaya Riyanto Riyanto; Chatarina Wariyah
agriTECH Vol 32, No 1 (2012)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (202.3 KB) | DOI: 10.22146/agritech.9659

Abstract

Aloe vera had functional properties as an antioxidant due to its flavonoid compound. However, the use of aloe veraextract were less practical, perishable and low acceptability. Therefore, aloe vera would be processed into aloe vera drink. The purpose of this research was to produce acceptable aloe vera drink with high antioxidative effect. Specifically, the objectives of this research were to evaluate antioxidative activity of aloe vera extract, to evaluate antioxidative properties changes during processing of aloe vera drink based on their ability to scavenge DPPH radicals and to inhibite lipid peroxidation, and to determine process conditions that resulted acceptable product. The research showed that aloe vera extract had high antioxidative activity shown by the percentage of Reactive Scavenging Activity (RSA) of 35.17 % and inhibition of lipid peroxidation of 49.53 %. Blanching of aloe vera gel with the higher temperature, produced aloe vera drink with low antioxidative activity. The antioxidative activity in every stage of processing aloe vera drink decreased especially after immersion in NaCl or lime solution. Processing of aloe vera drink with blanching at temperature of 70 °C produced the most acceptable aloe vera drink with high antioxidative activity.ABSTRAKLidah buaya atau aloe vera memiliki sifat fungsional sebagai antioksidan karena mengandung senyawa flavonoid.Penggunaan lidah buaya dalam bentuk ekstrak kurang praktis, mudah rusak dan akseptabilitasnya rendah. Oleh karena itu dilakukan pengolahan gel lidah buaya menjadi minuman lidah buaya. Tujuan penelitian ini adalah menghasilkan minuman lidah buaya dengan sifat antioksidatif dan akseptabilitas tinggi. Secara khusus tujuannya adalah mengevaluasi aktivitas antioksidasi ekstrak lidah buaya, mengevaluasi perubahan sifat antioksidatif lidah buaya selama pengolahan minuman lidah buaya berdasarkan kemampuannya menangkap radikal bebas DPPH dan menghambat peroksidasi lemak, dan menentukan kondisi proses terbaik yang dapat menghasilkan minuman lidah buaya dengan akseptabilitas tinggi. Hasil penelitian menunjukkan bahwa ekstrak lidah buaya memiliki aktivitas antioksidasi dengan persentase Reactive Scavenging Activity (RSA) sebesar 35,17 % dan penghambatan peroksidasi lemak 49,53 %. Blansing gel lidah buaya dengan suhu semakin tinggi menghasilkan minuman lidah buaya dengan aktivitas antioksidasi rendah. Aktivitas antioksidasi pada setiap tahap pengolahan minuman lidah buaya semakin menurun terutama setelah perendaman dalam larutan NaCl atau larutan kapur. Pengolahan minuman lidah buaya dengan suhu blansing 70 oC dapat menghasilkan minuman lidah buaya yang paling akseptabel dengan aktivitas antioksidasi tinggi.
Efek Antioksidatif dan Akseptabilitas Bakso Daging Ayam Ras dengan Penambahan Gel Lidah Buaya Chatarina Wariyah; Riyanto Riyanto
agriTECH Vol 38, No 2 (2018)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (385.05 KB) | DOI: 10.22146/agritech.31850

Abstract

Currently, the consumption of broiler-chicken meat increases up to 3.7510 kg/cap/year. This condition is due to the increasing of population growth and food businesses which use chicken meat. On the other hand, the chicken meat contains of high fat, thus easily oxidized and resulted in free radicals and off- flavor. Chicken meat is widely used as meatball that is processed through the stage of meat-milling and boiling which triggers fat oxidation. Therefore, an antioxidant is needed to inhibit oxidation. Aloevera contains flavonoid compounds that could scavange free radicals. The objective of this research was to optimize the addition of aloe vera gel in the chicken meatball to obtain high antioxidant effect and acceptable product. Considering its high water content (> 98%), in this study aloe vera gel was added as an ice-substitution in the making of meatball. The meatballs were made by mixing of 250 g chicken meat with 125 g tapioca for each sample, seasoning (salt, pepper, garlic), and added ice with water/aloe vera gel  ratio (g/g) of 100/0; 85/15; 70/30; 55/45 and 40/60. The doughs were molded in ball-shape then boiled at 90 oC for 10 minutes. The meatballs were subjected to analysis of moisture content, the ability to scavenge of 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical or radical scavenging activity (RSA), acid, peroxide and thyobarbituric acid (TBA) number,  physical properties including water holding capacity (WHC), cooking loss, and texture (softness, chewiness and deformation) as well as  acceptability by hedonic test. The results showed that the highest acceptability and antioxidative activity of meatballs was obtained in meatball with the ratio of water/gel between 55/45- 40/60 (g/g). This aforementioned meatball had softer texture and likely chewiness. The percentage of the WHC and cooking loss were not significantly different, but it had high RSA and lowest value of acid, peroxide and TBA numbers. ABSTRAKSaat ini konsumsi daging ayam ras pedaging meningkat hingga mencapai 3,7510 kg/kap/tahun. Hal ini disebabkan antara lain oleh meningkatnya jumlah penduduk dan usaha di sektor pangan yang menggunakan daging ayam ras. Disisi lain, daging ayam ras mengandung lemak cukup tinggi, sehingga mudah teroksidasi menghasilkan radikal bebas dan penurunan flavor. Daging ayam ras banyak digunakan sebagai bakso yang diolah melalui proses penggilingan daging dan perebusan, sehingga dapat memicu terjadinya oksidasi lemak. Oleh sebab itu, diperlukan antioksidan untuk menghambat oksidasi. Aloe vera diketahui mengandung senyawa flavonoid yang dapat menangkal radikal bebas. Tujuan penelitian ini adalah melakukan optimasi penambahan gel lidah buaya pada pembuatan bakso daging ayam ras untuk menghasilkan bakso dengan efek antioksidatif tinggi dan disukai. Pada penelitian ini gel lidah buaya ditambahkan untuk mensubtitusi es batu yang digunakan pada pembuatan bakso, mengingat kandungan air gel tinggi (> 98%). Pembuatan bakso untuk setiap 250 g daging ayam ditambah 125 g tapioka, bumbu (garam, merica, bubuk bawang putih) dan es batu yang dibuat dengan variasi rasio air/gel lidah buaya (g/g): 100/0; 85/15; 70/30; 55/45 dan 40/60. Bahan dicampur menjadi adonan dan dibuat bola-bakso, selanjutnya direbus pada suhu 90 oC selama 10 menit. Analisis yang dilakukan adalah kadar air, kemampuan menangkap radikal DPPH, angka asam, peroksida dan TBA (thyobarbituric acid); sifat fisik: water holding capacity (WHC), cooking loss, tekstur (kelunakan, kekenyalan dan deformasi) dan akseptabilitas bakso ditentukan secara inderawi dengan Hedonic Test. Hasil penelitian menunjukkan bahwa bakso dengan akseptabilitas dan aktivitas antioksidasi tinggi dibuat dengan es batu dengan rasio air/gel lidah buaya 55/45-40/60 (g/g).  Bakso tersebut lebih lunak dan kekenyalannya disukai. Persentase WHC dan cooking loss tidak berbeda nyata, nilai RSA tinggi, sedangkan angka asam, peroksida dan TBA paling rendah.
Penerapan teknologi pengolahan permen fungsional Lidah Buaya Pada Petani di Desa Argodadi, Sedayu, Bantul, DIY Chatarina Wariyah; Riyanto Riyanto
Unri Conference Series: Community Engagement Vol 3 (2021): Seminar Nasional Pemberdayaan Masyarakat
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/unricsce.3.242-247

Abstract

Argodadi village is located in Sedayu District, Bantul Regency, DIY. Its hilly and calcareous soil conditions and rice fields without technical irrigation lead to drought, therefore farmers initiated for planting of aloe vera. The Demangan Village Farmers community is one of the groups that cultivate aloe vera plants. They have 20 members with 1,000 m2 area of aloe vera plant. The resulted aloe vera leaves were sold to the aloe vera gel drink producer with low prices. The purpose of this activity was to develop aloe vera leaf processing into aloe vera candy- functional food to increase their income and to diversify aloe vera gel processing. The activity used counseling method, practice and assistance to transfer technology in making aloe vera soft candy and the packaging methods. The results showed that the skills of the farmers in making candy were increased, which shown by the bright colors and good textures of the aloe vera soft candy from their practice. The moisture content of the candy appropriate with quality standard and the candy had antioxidative activity. However, it was need assistance in the application of this technology to guarantee for the sustainability as an effort to increase income.