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agriTECH

agritech
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Published by Universitas Gadjah Mada

ISSN : 02160455 EISSN : 25273825 DOI : 10.22146/agritech

Core Subject : Agriculture,

Agriculture, Biological Sciences & Forestry

Agritech with registered number ISSN 0216-0455 (print) and ISSN 2527-3825 (online) is a scientific journal that publishes the results of research in the field of food and agricultural product technology, agricultural and bio-system engineering, and agroindustrial technology. This journal is published by Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta in colaboration with Indonesian Association of Food Technologies (PATPI).

Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Pertanian dan Biologi (Lain-Lain)

Articles 10 Documents

Search results for , issue "Vol 39, No 1 (2019)" : 10 Documents clear

Antioxidant Activity and Total Flavonoid of Carica papaya L. Leaves with Different Varieties, Maturity and Solvent Fatma Zuhrotun Nisa; Mary Astuti; Sofia Mubarika Haryana; Agnes Murdiati
agriTECH Vol 39, No 1 (2019)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Carica papaya leaves are one of the vegetables consumed by Indonesian people, especially in Java Island. Carica papaya is easy to grow in Indonesia and has many variants, so, Carica Papaya leaves is a local potent to be developed for functional food and nutraceutical. The aim of this study was to investigate antioxidant activity and total flavonoids of Carica papaya leaves with different varieties, maturity and solvent. Carica papaya leaves (CPL) was firstly extracted by methanol to select two CPLs with high antioxidant capacity and total flavonoid. The two selected CPLs were further tested with different ages mainly young and mature leaves. One selected CPL was further tested with different extraction solvents. Antioxidant activity was determined by 2.2 diphenyl-1-picrylhydrazyl, DPPH and Ferric reducing antioxidant power, FRAP. This study used five varieties of Carica papaya leaves, namely Bangkok, California, Purple, Golden and Grendel. The result showed that Golden and Grendel varieties had a higher percentage of radical scavenging property than the others, which was 78.37% and 77.40% by the DPPH method. Grendel and Purple had a higher percentage of radical scavenging property, which was 45.82 and 34.32 mmol/mg. Grendel and Purple had a higher total flavonoid property, which was 50.33 and 46.02 µg/g. Mature leaves had a higher percentage of radical scavenging property than young leaves by DPPH and FRAP methods. Mature leaves had a higher total flavonoid property than young leaves in both Grendel and Purple. Grendel had a higher antioxidant activity and a higher total flavonoid property than Purple. Grendel with water extraction had a higher antioxidant activity by DPPH and FRAP methods. The total flavonoid of Grendel papaya leaves’ extract with water extraction was lower than ethanol 70% and methanol.

Perubahan Fisiko-Kimiawi dan Mikrobiologis Minuman Tradisional Bali (Loloh) selama Penyimpanan I Desak Putu Kartika Pratiwi; I Ketut Suter; Putu Ari Sandhi Widpradnyadewi; Anak Agung Istri Sri Wiadnyani
agriTECH Vol 39, No 1 (2019)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Loloh is a Balinese traditional beverage made from one or a combination of several herbal extracts. The most popular variants of loloh in Bali are loloh tibah and loloh cem-cem, which are continuously produced every day. During distribution, loloh is stored at room temperature. The study was aimed to study the physico-chemical and microbiological characteristics of loloh cem-cem and loloh tibah during storage at room temperature. This study used a purposive random sampling. The samples consisted of 14 loloh sellers in Badung-Denpasar. Type parameters that were observed during a 24 hour-storage at room temperature included pH, total soluble solid, titratable acidity, ascorbic acid, total plate count, total yeast and mold count. During room temperature storage, the level of total plate count, total mold/yeast of loloh cem-cem and loloh tibah changed significantly. The shelf life of loloh cem-cem was only 12 hours at room temperature (28-30 oC) with the characteristics of pH 2.95, TSS 5.67 °Brix, vitamin C 19.35 mg/100 g, titratable acidity 0.24%, log total plate count 6.48 Cfu/mL, log total mold/yeast 5.01 Cfu/mL. The shelf life of Loloh tibah was only 12 hours at room temperature (28-30 ºC) with the characteristics of pH 3.34, TSS 4.21 °Brix, Vitamin C 10.20 mg/100 g, titratable acidity 0.13%, log total plate count 6.68 Cfu/mL, log total mold/yeast 5.86 Cfu/mL. Beyond the 12 hour-storage, both of the lolohs had higher total colony counts than the upper standard limit.

Efek Antimikroba Kombinasi Nisin dengan Minyak Atsiri Curcuma pada Mikroorganisme Patogen dan Pembusuk Pangan Rohula Utami; Ardhea Mustika Sari; Asri Nursiwi; Dyah Ayu Ashari
agriTECH Vol 39, No 1 (2019)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Essential oil and nisin are natural compounds that have antimicrobial activity. Both compounds are generally recognized as safe (GRAS). The concentration of essential oil and nisin needed to inhibit the growth of microorganisms can be determined using the microdilution method. The combination of Curcuma xanthorrhiza, Curcuma longa, and Curcuma zedoaria (v/v) (0.25%; 0.5%; 1%; 2%; and 4%) with nisin (b/v) (62.5 IU; 125 IU; 250 IU; 500 IU; and 1000 IU) could inhibit the growth of Bacillus cereus FNCC 0057, Salmonella typhimurium FNCC 0050, Eschericia coli FNCC 0091, Staphylococcus aureus FNCC 0047, Pseudomonas fluorescens FNCC 0070, and Aspergillus niger FNCC 6080. In higher concentration, several combinations gave bacteriocidal effect on Bacillus cereus FNCC 0057, Salmonella typhimurium FNCC 0050, Eschericia coli FNCC 0091, and Pseudomonas fluorescens FNCC 0070. The combination of nisin with Curcuma xanthorrhiza, Curcuma longa, and Curcuma zedoaria showed synergistic activities in several target microorganisms.

Pemanfaatan Ekstrak Ubi Ungu sebagai Pewarna Merah pada Soft Candy dan Stabilitasnya Putu Timur Ina; Gusti Ayu Kadek Diah Puspawati; Gusti Ayu Ekawati; Gusti Putu Ganda Putra
agriTECH Vol 39, No 1 (2019)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

This study aimed to determine the purple sweet potato pigment extract concentration in soft candy formulation and its stability during storage. The research was conducted in two steps i.e. the addition of purple sweet potato pigment extract concentration in soft candy and of soft candy’s red pigment stability during storage. Firstly, the soft candy formulation was added with the red pigment of purple sweet potato extract in various concentrations, i.e. control (0% extract); 0.25% concentration of the pigment extract; 0.50%; 0.75%; and 1%. Secondly, the stability examination of pigment extract in soft candy was carried out at various storage temperatures: at refrigerator temperature (4 °C); at room temperature (27 ℃); and at 35 °C within the observation period of every 2 days for 14 days. The results showed that soft candy with the purple sweet potato red pigment extract addition of 0.75% concentration gave the highest value on panelists’ acceptance in terms of color, odor, texture, taste and overall acceptance as follows: 6.08 (like); 4.02 (neutral); 5.58 (like); 5.46 (rather like); and 5.92 (like), respectively, with the following levels of anthocyanin, total phenolic and antioxidant activity: 12,74±0,06 mg/100 g; 0,73±0,02 g/100 g and 0,76±0,02 g AAE/100 g, respectively. Stability of soft candy’s red pigment extract during storage at a temperature of 35 °C for 14 days showed a decline in the value of a* (redness), but an increase in the value of b* (yellowness) and the value of L (brightness), as a significant indicator of the purple sweet potato red pigment extract color change on soft candy, meanwhile at refrigerator (4 ℃) and room temperatures (27 ℃) after 14 days observation has not shown the loss or a significant reduction of red pigment color.

Kandungan Gizi, Beta Karoten dan Antioksidan pada Tepung Pisang Tongka Langit (Musa troglodytarum L.) Ika Yohanna Pratiwi; Oki Krisbianto
agriTECH Vol 39, No 1 (2019)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Banana fruit cultivar Tongka Langit is a typical plant from Moluccas which has not widely used and observed just yet. It has been believed and used by locals to relieve body heat, clean the kidneys, and keep the health of the digestion tract, but without scientific proof. This study aims the nutrition content of Tongka Langit flour, along with its carotenoids, beta carotene, and antioxidant content. The banana fruit was dried at 60 oC for 2 hours. Banana flour had been analyzed for moisture content, levels of ashes, levels of protein, the fibers, carbohydrates, vitamin C, mineral, carotenoids and antioxidant. It had been found that Tongka Langit flour contained 331,03 calories, 4,66% protein, 83,72% carbohydrate and 16,59% dietary fibers. Tongka Langit flour contained 7,92 mg/ 100 mg carotenoid total which 18,56% was beta carotene. As much as 0.35 mg/kg flavonoid was also found, along with its high level of antioxidant activity.

The Effects of Roasting Time of Unfermented Cocoa Liquor Using the Oil Bath Methods on Physicochemical Properties and Volatile Compound Profiles Nurhayati Nurhayati; Francis Maria Constance Sigit Setyabudi; Djagal Wiseso Marseno; Supriyanto Supriyanto
agriTECH Vol 39, No 1 (2019)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

This study aimed to measure the effect of roasting time on physicochemical properties and volatile compounds of unfermented cocoa liquor roasted with an oil bath method. Physicochemical properties (pH, temperature, and color), flavor, and volatile compounds were analyzed. The results showed that the longer the roasting time the higher the unfermented cocoa liquor’s temperature, °Hue, and ΔE value, but lower pH and L value. There were 126 volatile compounds obtained by various roasting time, identified as pyrazines (12), aldehydes (16), esters (1), alcohols (31), acids (15), hydrocarbons (11), ketones (19), and others (21). At 15, 20, and 25 minutes of roasting time, 69, 74, and 67 volatile compounds, respectively, were identified. Volatile compounds’ profiles were indicated to be strongly influenced by roasting time. The largest area and highest number of compounds, such as pyrazines and aldehydes, were obtained at 20 minutes, which was also the only time the esters were identified. As well as the time showed a very strong flavor described by panelists.

Phenolic Content and Antioxidant Activity of Black Glutinous Rice Anthocyanin during Fermentation by Pediococcus pentosaceus N11.16 Nanik Suhartatik; Akhmad Mustofa; Ponco Mursito
agriTECH Vol 39, No 1 (2019)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Anthocyanin was developed into natural food colorant in microemulsion systems to improve their stability and readiness for food preparation. Anthocyanin has an antioxidant activity. The degradation of anthocyanin into small compound could increase the biological activity. Anthocyanin was extracted from black glutinous rice and prepared using food grade surfactant such as Tween 80, Tween 20, and Span 80. Microemulsion was then added into modified deMann Rogosa Sharp (MRS) medium as much as 5, 10, 15, 20 and 25 ppm. Lactic acid bacteria genus Pediococcus pentosaceus N11.16 were grown for 18–24 hours and were used as enzyme producers. This experiment was aimed to determine the stability of anthocyanin in microemulsion systems to enzymatic degradation. The modified MRS medium was added with microemulsion and incubated for 24 h. Phenolic content remained stable during the fermentation process in all treatments, while the highest antioxidant activity was found in the sample with 20 ppm of anthocyanin. Total acid-producing bacteria were also monitored during the incubation and the result showed that there was a decline in their growth. There was a significant change in the antioxidant activity during incubation.

Analisis Kesiapan Modernisasi Daerah Irigasi Kedung Putri Pada Tingkat Sekunder Menggunakan Metode K-Medoids Clustering Ansita Gupitakingkin Pradipta; Anditya Sridamar Pratyasta; Sigit Supadmo Arif
agriTECH Vol 39, No 1 (2019)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Preparation for the modernization of the Kedung Putri Irrigation System (DI Kedung Putri) required a comprehensive assessment of the irrigation pillars, one of which was at the secondary level. To facilitate the assessment and development plan, a clustering was carried out using the k-medoids method, that used a representative data (called medoid) as the cluster center. Then, decision making was conducted by using the Analytic Hierarchy Process (AHP) method. The performance assessment of 21 secondary channels was stated as the readiness index of irrigation modernization (IKMI). The assessment result showed that 9.52% belonged to good criteria, 71.43% belonged to fair criteria, and 19.05% belonged to poor criteria. Based on these results that DI Kedung Putri was considered not ready yet to be modernized. For this reason, it was necessary to conduct the system improvement in groups, namely by grouping based on similarities (clustering). The used method was k-medoids clustering using Rapid Miner 9.0 software. The clustering result showed that the optimal cluster number was 4clusters, with the Davies Bouldin Index (DBI) value -1.959. The members of the 0, 1, 2 and 3 clusters were 6, 6, 8 and 1 secondary channels, respectively. Furthermore, a priority scale in clusters development was needed based on the performance of irrigation pillars on secondary channels. The results of AHP analysis showed that the order of priority development starts from cluster 0, followed by cluster 2, 1 and 3. The recommendations for the development of secondary channels incorporated in cluster 0, such as increasing water supply, routine infrastructure maintenance, technical assistance, and public campaigns in irrigation management. The secondary channels incorporated in cluster 3 had good performance on all pillars, so it only needed to maintain the existingoperation and maintenance patterns.

Near Infrared Reflectance Spectroscopy: Prediksi Cepat dan Simultan Kadar Unsur Hara Makro pada Tanah Pertanian Devianti Devianti; Sufardi Sufardi; Zulfahrizal Zulfahrizal; Agus Arip Munawar
agriTECH Vol 39, No 1 (2019)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Plants need an ideal and healthy soil condition for their growth and a sufficient amount of soil macronutrients. To determine soil nutrients, several methods have been widely employed. Yet, most of them are based on solvent extraction, which is normally time-consuming, requires complicated sample preparation, and sometimes involves chemical materials. Thus, a novel, fast and simultaneous method is required as an alternative method used to predict soil macronutrients in a short period and without involving chemical materials. Near infrared spectroscopy (NIRS) can be considered for this need, since this method is fast, environmentally friendly, and non-destructive. Therefore, the main objective of this study is to apply an NIRS method to predict soil macronutrients (N, P, and K). The diffuse reflectance spectrum was acquired for soil samples in a wavelength range from 1000–2500 nm. Spectra data were corrected using a smoothing method whilst prediction models were developed using principal component regression (PCR) and partial least square regression (PLSR). Prediction accuracy and robustness were evaluated using these following statistical indicators: correlation coefficient (r), root mean square error (RMSEC) and residual predictive deviation (RPD). The results showed that NIRS was able to predict soil macronutrients simultaneously with a maximum correlation coefficient r = 0.97 for N prediction, r = 0.99 for P prediction, and r = 0.95 for K prediction. Thus, it may be concluded that an NIRS method is feasible to be applied as a novel, reliable and fast method to predict soil macronutrients (N, P, and K) simultaneously.

Simulating Streamflow Through The SWAT Model in The Keduang Sub-Watershed, Wonogiri Regency, Indonesia Andrianto Ansari; Tasuku Kato; Atiqotun Fitriah
agriTECH Vol 39, No 1 (2019)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Water resource modelling has been used to analyze the sustainability of the watershed affected by human activity and natural disasters. The objective of this research was to evaluate the SWAT model and its applicability in the Keduang Sub-Watershed for streamflow prediction, which is part of Bengawan Solo Watershed. A SWAT integrated with Geographic Information Systems (ArcGIS, version 10.4.1) was used to simulate Keduang Sub-Watershed streamflow for the period from 2008 to 2017. Model calibration and validation were performed for monthly and daily periods using Sequential Uncertainty Fitting 2 (SUFI-2) within SWAT-CUP using daily observed streamflow data at the catchment outlet. The results during calibration and validation periods showed that the value of the Nash-Sutcliffe Efficiency (NSE), the coefficient of determination (R2), Percent Bias (PBIAS) and Root Mean Square (RSR) had different values for daily and monthly simulation. The calibration and validation outputs for daily and monthly simulation showed a good model performance for discharges. In the daily simulation, the value of NSE, R2, PBIAS and RSR were 0.57; 0.58; -3.4 and 0.67 for calibration periods, whereas in the validation period the values of NSE, R2, PBIAS and RSR were 0.50; 0.51; -10.7 and 0.65, respectively. The monthly simulation had better results than the daily simulation where the value of NSE, R2, PBIAS, RSR were 0.79; 0.81; -6.2 and 0.54 for calibration periods, as well as 0.73; 0.69;-1.9 and 0.71 for validation periods, respectively. Those results indicated that the SWAT model was acceptable for Keduang watershed simulation based on the model performance which was higher than the minimum standard acceptance.

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Rachma Wikandari

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+6285712601130

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agritech@ugm.ac.id

Editorial Address
Faculty of Agricultural Technology, Universitas Gadjah Mada, Jl. Flora No. 1, Bulaksumur, Yogyakarta 55281, Indonesia

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Kab. sleman,

Daerah istimewa yogyakarta

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Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name Rachma Wikandari

Contact Email rachma_wikandari@mail.ugm.ac.id

Phone +6285712601130

Journal Mail Official agritech@ugm.ac.id

Editorial Address Faculty of Agricultural Technology, Universitas Gadjah Mada, Jl. Flora No. 1, Bulaksumur, Yogyakarta 55281, Indonesia

Location Kab. sleman, Daerah istimewa yogyakarta INDONESIA

Abstract

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Abstract

Contact Name
Rachma Wikandari

Contact Email
rachma_wikandari@mail.ugm.ac.id

Phone
+6285712601130

Journal Mail Official
agritech@ugm.ac.id

Editorial Address
Faculty of Agricultural Technology, Universitas Gadjah Mada, Jl. Flora No. 1, Bulaksumur, Yogyakarta 55281, Indonesia

Location
Kab. sleman,

Daerah istimewa yogyakarta

INDONESIA