Regina Tutik Padmaningrum
Universitas Negeri Yogyakarta

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TESTER KIT UNTUK UJI BORAKS DALAM MAKANAN Padmaningrum, Regina Tutik; Mawarti, Siti
Jurnal Penelitian Saintek Vol 18, No 1 (2013): APRIL 2013
Publisher : Jurnal Penelitian Saintek

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Abstract

Boraks digunakan  sebagai pengenyal  dan pengawet  makanan mempunyai  efek negatif terhadap kesehatan, sehingga perlu dikembangkan  alat yang dapat menguji boraks dalam makanan secara sederhana, cepat, dan praktis. Penelitian ini bertujuan mengembangkan  2 tester kit berdasarkan reaksi kimia yang spesifik antara boraks dengan pereaksi tertentu, yaitu  pereaksi barium  klorida  dan  HCI-NaOH-manitol. Penelitian  ini  dilakukan menggunakan metode penelitian  pengembangan.  Model pengembangan  yang digunakan adalah model prosedural. Pengembangan tester kit melalui beberapa tahap, yaitu: a) tahap perencanaan:  pemilihan pereaksi yang spesifik secara teoritis (kajian teoritis), b) tahap pengorganisasian:  uji coba reaksi antara larutan boraks dengan pereaksi  spesifik  dan penentuan komposisi stoikiometris antara pereaksi dengan boraks, c) tahap pelaksanaan: penyusunan tester kit, prosedur uji, keterangan fungsi tester, petunjuk keamanan dan cara penyimpanan.  Tester kit yang dikembangkan  terdiri atas a) seperangkat  alat sederhana seperti botol bertutup dan pipet tetes, b) pereaksi  kimia, c) prosedur uji, d) petunjuk keamanan, e) cara penyimpanan,  batas deteksi, akurasi, dan f) keterangan fungsi  tester kit.
PENINGKATAN EFISIENSI PROSES PRODUKSI KERAJINAN BAMBU MENGGUNAKAN MESIN PENGERING DI “TUNGGAK SEMI” BAMBOO HANDYCRAFT Padmaningrum, Regina Tutik; Wijanarka, Bernadus Sentot; Hariyanto, V. Lilik
INOTEK Volume 14, Nomor 2, Agustus 2010
Publisher : LPM UNY

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Abstract

The purpose of this article is to discuss the production efficiency of making bamboo handicraft product by using dryer. The dryer as a tool that can overcome this problems are discussed starting from assembly, specifications, operating guidelines, and test try. Planned dryer basically consists of the heating room and heating units. Heating room made of masonry walls plastered with cement on the outside and inside of the room walls. There are two door to enter the heat product. Two glass window, which serve as monitors heating conditions. Two thermometers was placed on glass window. Result dryer manufacture process has been tested with results as follows: has created a dryer the size of the heating room 3 m x 6 m x 2.25 m, a wall of brick covered with cement, and the ceiling is made of asbestos. Heating unit has dimensions of 40 cm x 40 cm x 60 cm. Heating unit is heated by LPG gas stoves. The results show that a heating unit capable of heating the room temperature from 30oC to 40oC in 10 minutes. The water content of dried products decreased from 17.1% to about 2.5%. The capacity of the dryer is 300 products. The cost for drying the product is Rp47.33, - per product
PERUBAHAN WARNA DAN KADAR P-KAROTEN DALAM TEPUNG UBI.JALAR (IPOMEA BATATAS, L ) AKIBAT PEMUTIHAN Padmaningrum, Regina Tutik; Utomo, M. Pranjoto
Jurnal Penelitian Saintek Vol 12, No 2 (2007): Oktober 2007
Publisher : Jurnal Penelitian Saintek

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Abstract

he researh to stuJlythe influence of the kinds and the concentrations of bleach solution to the co1lientof fJ<haroten and the color ofjaw a sweet potato flour has been done. Yellowjawa sweet potato was used in this reseach. This reseon:h was a descripstive qualitative research. The subject of the researdt was jawa sweet potato and the object was jawa sweet potato flourquantities  including the content of fi-charotenand the color of theflour.. TIre independen: variables were the kinds .and the concentrations of bleach solution. and the dependent variableswere the con/ell!offJ-charoten ami.the color ofjawa sweet potato flour. In  1.00% bleach solllliDn. the costen:  of fi-charoten  with sodium sulfite,  sodium  bisulfite.  Co(OHJ!l.>   ascorbic  acid  were: 2.18985,1.40835, 2.25795 and 0.78315 mgllOO grams flour  respectively. In1.00% bleach solution. the color of soaked jawa sweet potato flour  in sodium sulfite, sodium bisulfite,. Ca(OH);]a>scorbic acid were: red (R= 0.3) =yellow (Y = 0.7). red (R = O.2)-yeJlow (Y = 0.5), red (R = 0.5)-yellow(Y=   1.0)andred(R=0.1)-yeHow(R     = 1.2) respectively. Theresearch showed that the concentration of bleach solution influencedsignificantly the content of fJ-cIwroten and the color of jawa  sweet potato flour. The concentration ofbead: solution tat yielded the bigest content offJ-charotenwas LOW"".Keywords:jlour,jawasweetpofalo.  color.fJ-charoten
RECOVERY OF GOLD (Au) AND SILVER (Ag) METALS IN THE ELECTRONIC WASTE THROUGH MULTILEVEL PRECIPITATION PROCESS Marwati, Siti; Padmaningrum, Regina Tutik; Sunarto, Sunarto
Jurnal Sains Dasar Vol 4, No 2 (2015): Jurnal Sains Dasar
Publisher : Yogyakarta State University

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Abstract

This research aims to determine the percent recovery of gold (Au) and silver (Ag) in the electronic waste such as CD-RW and determine the purity of gold and silver metals in the electronic waste such as CD-RW that through multilevel precipitation process. The first step was the optimization of the concentration of thiourea and time dissolution of gold and silver in the sample. The concentration of thiourea and the time dissolution optimum obtained from conentration of gold and silver maximum. By The percent recovery of gold and silver are determined by comparing the concentration of gold and silver between in the solution sample and in the sample without dissolution that be analyzed by XRF. The scond step was the multilevel precipitation process and calcination. Precipitation and calcination of the filtrat was dissolution results in the optimum condition. Reagent used was a solution of hydrochloric acid and potassium carbonate. The precipitation gold and silver produced from the precipitation of dissolution again and then be analyzed by atomic absorption spectrophotometry. The purity was determined by comparing the weight of gold and silver between in the precipitate and in the solution.  The results of this research showed that the percent recovery of the silver in the CD-RW through the process dissolution with thiourea 10 g/L and 4 hours soaking time were 21.09 %. The purity silver preipitate were 0.15 %. The percent recovery and the purity of gold can  not be determined because the gold contained in the sample were not detected or below the limit of detection equipment. Keywords: recovery, gold, silver, electronic  waste
VALIDATION OF CYCLAMATE ANALYSIS METHOD WITH SPECTROPHOTOMETRY AND TURBIDIMETRY Padmaningrum, Regina Tutik; Marwati, Siti
Jurnal Sains Dasar Vol 4, No 1 (2015): Jurnal Sains Dasar
Publisher : Yogyakarta State University

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Abstract

This research aims to validate methods of analysis by spectrophotometry and turbidimetry cyclamate in the sample drink mango-flavored jelly drink  by spectrophotometry with hypochlorite reagent, ultraviolet spectrophotometry (without reagent) and turbidimetry. The object of research was the validity parameters spectrophotometric method were linearity, linear range, the limit of detection, limit of quantitation, precision, and accuracy. The calibration curve of standard solution of sodium cyclamate in the spectrophotometric method with hypochlorite reagent, UV spectrophotometry (without reagent), and turbidimetry are linear. Linear range each method respectively at a concentration were (211.36-747.08); (16.000-146.434); and (1.8521-6.1717) ppm. The detection limit of each method successively were 53.6028; 0.5833; and 0.2723 ppm. Limit of quantitation each method successively were 66.9948; 1.9443; and 0.8068 ppm. Spectrophotometric analysis method cyclamate with hypochlorite reagent had good precision and accuracy. Ultra violet  spectrophotometric analysis method of cyclamate have a good precision but the accuracy was not good. Turbidimetric methods  analysis of cyclamate had  precision and accuracy were not good.Keywords:   method validation, spectrophotometry, turbidimetry, cyclamate
KECERDASAN EMOSIONAL DOSEN DITINJAU DARI JENIS KELAMIN Padmaningrum, Regina Tutik
Jurnal Kependidikan: Penelitian Inovasi Pembelajaran VOL 38,No. 2
Publisher : LPPM UNY

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (71.575 KB) | DOI: 10.21831/jk.v38i2.20732

Abstract

The aim of the study was to identify 1) the level of emotionalquotient of the lecturers of Mathematics and Natural Sciences basedon their gender at various universities in the Province ofYogyakarta, and 2) the differences in the emotional quotient amongthe lecturers. The study was ex-post facto research. As the researchvariable, emotional quotient was defined as the scores resultingfrom the EQ questionnaire to include self emotion knowing, selfemotion management, self motivation, others emotion knowing, andrelationship construction. The population of the study wasdesignated to be the lecturers of Mathematics and Natural Sciencesat various universities in Yogyakarta Province. The sample of thestudy consisted of 141 lecturers, 72 male and 69 female, taken bypurposive random sampling technique. The instrument was thequestionnaire adapted from relevant references (Ridwan Saptoto:2002). Data were analyzed qualitatively by conversion criteria. EQdifferences were computed statistically by a t-test. Results showedthat the average score of EQ levels of male and female lecturerswere 79.6% (very high criteria) and 78.2% (high criteria). Thedifference (1.4%) was not statistically significant