N. Sri Hartati, N. Sri
Pusat Penelitian Bioteknologi-LIPI, Jln. Raya Bogor Km 46 Cibinong 16911

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Minimalisasi Penurunan Kadar Beta-Karoten dan Protein dalam Proses Produksi Tepung Ubi Kayu Fathoni, Ahmad; Hartati, N. Sri; Mayasti, Nur Kartika Indah
JURNAL PANGAN Vol 25, No 2 (2016): PANGAN
Publisher : Perum BULOG

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1133.555 KB) | DOI: 10.33964/jp.v25i2.327

Abstract

The conventional method of cassava flour production significantly reduces the levels of beta-carotene and protein in the product. Therefore, the method needs to be improved in order to minimize the loss. This study investigated the effect of some treatments on beta-carotene and protein stability including the use of a) various antioxidant agents; 0.3 percent of ascorbic acid, 0,3 percent of sodium metabisulphite and 8 percent of mixture of gum arabic and dextrin (1 : 1), b) different drying methods; cabinet dryer at 40°C and 50°C and sun drying, in cassava flour processing of two carotenoid-rich local cassava varieties; Adira 1 and Mentega 2. The results showed that the use of sodium metabisulphite and cabinet dryer at 40°C were the most effective methods to minimize the loss of beta-carotene and protein. Beta-carotene and protein content in cassava flour obtained from those treatments were 9,44±0,10 µg/g and 2,41 percent compared to control which was 4,92±0,29 µg/g and 2,1 percent whereas sun drying method reduced beta-carotene and protein content by 55,82 percent and 18,43 percent, respectively. Packaging in aluminum bags minimized the loss of beta-carotene and protein in the product during the first 3 months of storage. 
Molecular Characteristics of Cassava Carvita 25 Somaclonal Variant Using SSR Marker Hartati, Hartati; Ramadanti, Nur Ayu; Putri, Dwi Hilda; Hartati, N. Sri
Jurnal ILMU DASAR Vol 21 No 2 (2020)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jid.v21i2.9396

Abstract

Cassava is one of the most important food commodities besides rice and corn. Carvita 25 is a somaclonal variation that was induced from Adira IV cassava variety. Our study aimed to analyze the genetic differences of Carvita 25 compared to Adira IV by using SSR markers. Two cassava varieties, Carvita 25 and Adira IV, were used as plant materials and eleven SSRY primers were used to amplifythe fragments of cassava DNA. The results showed that SSRY 151 primer produced the highest polymorphic band (85.71%) where 6 out of 7 alels were polymoprphics with the length size from 120 to 600 bp. Of the total 56 of polymorphic bands, 26 alels were previously present in Adira IV but then it can not be found in Carvita 25, while 30 other bands were new fragments that were previously not present in Adira IV but then were present in Carvita 25. These genetic differencesof both Adira IV and Carvita 25 were also strengthened by the Jacard similarity value. The Jaccard similarity between Carvita 25 and Adira IV were 0.40-0.50, while the similarity between plants of Carvita 25 were 0.79-0.87, and in plants of Adira IV were 0.98- 1.These values showed thewide genetic difference between Adira IV and a somaclonal variation of Carvita 25.Keywords: cassava, Carvita 25, polymorphic, somaclonal variation, SSR Marker.
OPTIMASI SUHU ANNEALING PRIMER DEGENERATE UNTUK MENGAMPLIFIKASI FRAGMEN GEN ARGININE DECARBOXYLASE (ADC) GENOM UBI KAYU LOKAL MALUKU TENGGARA Kurniawati, Siti; Hartati, N. Sri
Indonesian Journal of Biotechnology and Biodiversity Vol 1, No 2 (2017): Indonesian Journal of Biotechnology and Biodiversity
Publisher : Universitas Esa Unggul

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Abstract

AbstractArginine decarboxylase (ADC) is an enzyme that plays a role in polyamine biosynthesis and has been shown to increase resistance to biotic and abiotic stress. Woody oak (Manihot esculenta Crantz) is known to grow and produce well in dry and poor nutrient conditions. The purpose of this study was to obtain optimum conditions in PCR reaction process to obtain candidate gene fragment of ADC. Four pairs of primers to amplify the gene fragments of ADC are degenerate from several plants that have been deposited on NCBI databases, namely Jatropa curcas (Acc XM_022220421), Populus trichocarpa (Acc XM_002306105.2), Capsicum annuum cv Nockwang (Acc KC160547.1) and Lycopersicon esculentum (Acc L16582.1). The success in amplifying a gene by PCR technique using a specially designed primer is determined by the precision of the primary attachment temperature with the DNA mold. Four primer pairs are designed to successfully amplify DNA sequence fragments from the local cassava genome from Malra, namely Malra012 and Malra016 genotypes. The MeadC1 primary pair can amplify the DNA mold and produce bands of less than 1,000 base pairs at a fixed temperature of 46 ° C.47 ° C. and 48 ° C. Nucleotide base sequence analysis using primary pair MeadC1 has been done, but based on bioinformatic analysis using NCBI BLAST program, the obtained fragment did not show the encoding fragment of ADC gene. Keywords : cassava, arginine decarboxylase, AADC AbstrakArginine decarboxylase (ADC) merupakan enzim yang berperan dalan biosintesis poliamin dan telah terbukti dapat meningkatkan ketahanan terhadap cekaman biotik dan abiotik.Ubi kayu (Manihot esculenta Crantz) dikenal mampu tumbuh dan berproduksi dengan baik meski pada kondisi kering dan miskin hara. Tujuan dari penelitian ini adalah untuk mendapatkan kondisi optimum pada proses reaksi PCR untuk memperoleh kandidat fragmen gen ADC. Empat pasang primer untuk mengamplifikasi fragmen gen ADC dirancang secara degenerate dari beberapa tanaman yang telah terdeposit pada database NCBI yaitu Jatropa curcas (Acc XM_012229042.1), Populus trichocarpa (Acc XM_002306105.2), Capsicum annuum cv Nockwang (Acc KC160547.1) dan Lycopersicon esculentum (Acc L16582.1). Keberhasilan dalam amplifikasi suatu gen dengan teknik PCR menggunakan primer yang dirancang khusus sangat ditentukan oleh ketepatan suhu penempelan primer dengan cetakan DNA. Empat pasang primer yang didesain berhasil mengampifikasi fragmen sekuen DNA dari genome ubi kayu lokal asal Malra yaitu genotipe Malra012 dan Malra016. Pasangan primer MeADC1 dapat mengampifikasi cetakan DNA dan menghasilkan pita dengan ukuran kurang dari 1.000 pasang basa pada suhu penempelan 46°C.47°C dan 48°C. Analisis sekuen basa nukleotida menggunakan pasangan primer MeADC1 telah dilakukan, namun berdasarkan analisis bioinformatik menggunakan program BLAST NCBI, fragmen yang diperoleh tidak menunjukkan fragmen penyandi gen ADC. Kata kunci: ubi kayu, arginine decarboxylase, ADC